LED Savings Calculator

LED savings calculator guide

An LED savings calculator estimates how much electricity and money you can save by replacing older bulbs with LED bulbs. The calculation compares the wattage of your existing bulbs with the wattage of the new LED bulbs, then combines that difference with the number of bulbs, how long they are used, how many days per week they run, and your electricity price per kilowatt-hour. The result is an estimate of weekly, monthly, yearly, and long-term savings.

LED bulbs are usually far more efficient than incandescent and many older halogen bulbs. A common 60-watt incandescent bulb may be replaced by a 9-watt LED that produces similar brightness. That means the bulb uses 51 fewer watts whenever it is on. One bulb may not sound like a large change, but several bulbs used for many hours per week can reduce energy use noticeably. This tool helps turn that wattage difference into practical money numbers.

The calculator is designed for homes, shops, offices, garages, rental properties, small businesses, and anyone comparing lighting upgrade costs. It can estimate direct electricity savings and, if you enter a price per LED bulb, it can also estimate the payback period. The payback period shows approximately how long it may take for the energy savings to recover the upfront cost of buying the new bulbs.

How LED savings are calculated

The core formula starts with wattage saved per bulb. Subtract the LED wattage from the existing bulb wattage. If the old bulb is 60 watts and the new LED is 9 watts, the wattage saved per bulb is 51 watts. Multiply that by the quantity of bulbs to get total watts saved while the lights are on. Ten bulbs would save 510 watts while operating.

Next, the calculator estimates annual usage hours. Hours per year equals hours used per day multiplied by days used per week multiplied by 52 weeks. If lights are used 5 hours per day and 7 days per week, each bulb is used about 1,820 hours per year. Energy savings in kilowatt-hours equals total watts saved multiplied by annual hours, divided by 1,000 because there are 1,000 watts in one kilowatt.

The calculator accepts energy cost either as a major currency amount per kWh or as cents per kWh. If your utility rate is 15 cents per kWh, choose cents/kWh and enter 15. If you prefer to enter the full currency amount, choose per kWh and enter 0.15. Both inputs describe the same electricity price when the currency is dollars, euros, pounds, rupees, yen, or another selected symbol.

What each input means

Quantity of bulbs is the number of bulbs you plan to replace. Use one room, one floor, one fixture type, or the entire property, depending on what you want to estimate. If different rooms use different bulb wattages or different schedules, it is often better to calculate each group separately and add the results together.

Existing bulb wattage is the wattage printed on the current bulb or fixture. Incandescent bulbs commonly use 40, 60, 75, or 100 watts. Halogen bulbs often use less than equivalent incandescent bulbs but still more than LEDs. Compact fluorescent bulbs can also be compared, although the savings may be smaller than when replacing incandescent bulbs.

New LED wattage is the wattage of the replacement bulb, not the brightness equivalent. Many LED packages say something like 60-watt equivalent while using only 8 to 10 watts. Enter the actual LED watts, not the equivalent incandescent watts. The actual wattage is the number that determines electricity use.

Hours used per day and days per week describe the lighting schedule. A hallway bulb that runs one hour per day will save less money than an outdoor security light that runs all night. Energy cost per kWh is your electricity price. If your bill includes different rates, taxes, or delivery charges, choose a rate that best represents the energy cost you want to estimate.

Understanding the results

Yearly savings is usually the headline result because it captures a full pattern of weekly use. Monthly and weekly savings are derived from that yearly estimate. A monthly result is useful for household budgets because utility bills are often monthly. Weekly savings are useful when lights are used on a repeating weekly schedule, such as a business that runs Monday through Friday or a home office used on weekdays.

The kWh saved per year result shows electricity reduction before price is applied. This is helpful because electricity rates can change. If you know the kWh savings, you can quickly estimate savings at another rate. For example, 500 kWh saved is worth $75 at $0.15/kWh, but $125 at $0.25/kWh. If rates rise, the same efficient bulbs save more money.

Payback months compares upfront LED purchase cost with average monthly savings. If a set of bulbs costs $40 and saves $10 per month, the simple payback is about four months. This is a simple estimate, not a full financial model. It does not include financing, taxes, rebates, replacement labor, maintenance time, or the value of improved light quality. Still, simple payback is a useful first check for deciding whether an upgrade makes sense.

Five-year net savings subtracts the optional bulb purchase cost from five years of estimated electricity savings. It provides a longer-term view because LEDs often last for years. If you are comparing several upgrade options, long-term net savings can be more useful than first-year savings alone.

Example LED savings calculation

Suppose you replace 12 old 60-watt bulbs with 9-watt LED bulbs. The wattage saved per bulb is 51 watts. Across 12 bulbs, the lights save 612 watts whenever they are on. If those bulbs run 4 hours per day and 7 days per week, annual use is 1,456 hours. The annual energy savings are 612 watts multiplied by 1,456 hours divided by 1,000, which equals about 891 kWh per year.

At an electricity price of $0.18 per kWh, those 891 kWh save about $160 per year. If each LED bulb costs $4, the total upgrade cost is $48. The simple payback is roughly $48 divided by monthly savings of about $13.36, or about 3.6 months. After the payback period, the ongoing electricity reduction continues to lower bills as long as the bulbs are used in a similar way.

A second example might be a small shop replacing 30 halogen bulbs at 50 watts each with 7-watt LEDs. If the lights operate 10 hours per day for 6 days per week, the savings are much larger because both quantity and usage time are higher. This is why commercial lighting upgrades can often pay back quickly, especially in areas where lights stay on for long business hours.

Choosing realistic electricity rates

Electricity rates are not always as simple as one number. Some bills show an energy charge, a delivery charge, fixed fees, taxes, and time-of-use pricing. For a quick estimate, many people use the average cost per kWh from their bill: total bill divided by kWh used. For a more conservative estimate, use only the variable energy cost that changes when you use less electricity. Fixed monthly fees usually do not go down just because you replace bulbs.

If you are on a time-of-use plan, use the rate that applies when the lights are usually on. Evening lighting may fall into peak or off-peak periods depending on your utility. Outdoor lighting that runs overnight may use a different rate than office lighting used during the day. Matching the rate to the schedule improves the estimate.

If you want to compare how much one rate differs from another, a separate Percentage Change Calculator can help quantify rate increases or decreases. For the LED calculator itself, the important part is entering the best cost per kWh for the lights you are evaluating.

Why LED savings vary by room and property

The same bulb replacement does not save the same amount everywhere. A bedroom lamp used briefly each night will save less than a kitchen fixture used for several hours every day. A basement, garage, office, hallway, porch, or storefront may have very different operating hours. That is why the calculator asks for both hours per day and days per week instead of assuming a fixed schedule.

For homes, it can be helpful to group bulbs by usage pattern. Calculate frequently used areas first, such as kitchens, living rooms, exterior lights, and home offices. Then calculate occasional-use areas separately. For businesses, group bulbs by operating zone, such as sales floor, storage, signage, exterior lighting, and office space. This creates a more realistic savings picture than averaging every bulb together.

Room size can also influence how many bulbs you need, but the savings calculation itself depends on wattage and run time. If you are planning a renovation or estimating areas for a project, a Square Footage Calculator can help with room measurements, while this LED calculator handles electricity and payback estimates.

LED brightness, lumens, and wattage

When replacing bulbs, wattage tells you energy use, but lumens tell you brightness. Older incandescent shopping habits often treated watts as a brightness guide because most bulbs used similar technology. With LEDs, watts are not a reliable brightness comparison by themselves. A 9-watt LED can be much brighter than another 9-watt LED depending on design and efficiency, so look at lumens when choosing replacements.

Common rough equivalents are about 450 lumens for a 40-watt incandescent, 800 lumens for a 60-watt incandescent, 1,100 lumens for a 75-watt incandescent, and 1,600 lumens for a 100-watt incandescent. These are approximate because bulb shape, color temperature, fixture design, and beam angle affect perceived brightness. The calculator focuses on energy and money, so make sure the LED bulbs you choose also meet your lighting needs.

Color temperature and color rendering can matter as much as efficiency. Warm white LEDs may be preferred in bedrooms and living rooms, while neutral or cool white LEDs may be better for task areas, garages, or workspaces. Dimmable fixtures require compatible dimmable LED bulbs and sometimes compatible dimmer switches. A low-watt LED that flickers or looks unpleasant may not be a good upgrade even if the calculated savings are attractive.

Mistakes to avoid

• Do not enter LED equivalent wattage as actual LED wattage. Use the real watts printed on the LED package.
• Do not use 24 hours per day unless the lights truly run all day and night.
• Do not mix bulbs with very different usage schedules unless you only need a rough estimate.
• Do not ignore electricity rate units. Fifteen cents per kWh is 0.15 in major currency units, not 15 dollars per kWh.
• Do not treat payback as a guarantee. It is an estimate based on the inputs you enter.

Another common mistake is replacing every bulb before checking compatibility. Enclosed fixtures, outdoor locations, damp areas, dimmers, and specialty sockets may need specific LED bulb types. Verify the bulb base, fixture rating, brightness, color, and dimmer compatibility before purchasing a large quantity. The financial estimate is only useful if the selected bulbs are suitable for the actual fixtures.

The practical logic behind LED savings

LED savings are easy to understand because the basic trade is visible: the room receives similar useful light, but the fixture uses fewer watts while it is on. The calculator turns that visible swap into a yearly energy estimate. The key is not only the wattage difference. It is wattage difference multiplied by time. A small bulb used all night can save more than a larger bulb used only a few minutes per week.

Wattage is power, not total energy

A watt describes how quickly a bulb uses electricity while it is operating. A kilowatt-hour describes total energy over time. That distinction is why usage schedule matters so much. A 60-watt bulb does not use 60 watt-hours until it has run for one hour. A 9-watt LED does not create big savings by sitting in the fixture; it saves electricity only during the hours it replaces a higher-watt bulb.

The fastest mental check

A simple mental check is to look for lights that are both high wattage and high use. Porch lights, kitchen cans, office fixtures, retail lights, hallway lights, garage lights, and signs often matter more than occasional table lamps. This is also why two homes with the same bulb count can have very different savings: the room schedule matters as much as the bulb label.

If you want a broader appliance-style view of electricity use beyond lighting, the Electricity Cost Calculator can help compare kWh and rate assumptions for other devices on the same bill.

Important formulas for LED savings and payback

The formulas below are the backbone of the calculator. They are simple enough to audit by hand, which is useful when you are comparing several rooms or explaining the estimate to someone else. The main idea is to move from watts saved to kWh saved, then from kWh saved to money saved.

Simple payback and net savings

Simple payback divides the upfront bulb cost by the average monthly savings. It is not a full financial model, but it is useful for a quick household or small-business decision. Five-year net savings takes a longer view by subtracting the bulb cost from five years of energy savings. That can make a small monthly saving feel more meaningful when the bulbs are used often.

If you are comparing the size of one savings result against another, the Percentage Calculator can help translate differences into a simple percent relationship.

Grouping bulbs by room, fixture, and schedule

The best LED savings estimates usually come from grouping bulbs. One blended number for an entire property can be useful for a quick first look, but it can hide the rooms that actually create savings. A living room lamp, a kitchen recessed light, a porch fixture, a retail display, and a warehouse aisle can all have different wattages and schedules. Grouping keeps the estimate honest.

Group by usage first

Start with lights that operate on similar schedules. A set of kitchen lights used five hours daily should not be averaged with a guest-room lamp used twice a month. For a business, sales-floor lights, back-office lights, storage lights, security lights, and signage often deserve separate estimates. This makes the savings picture more useful because each group can be upgraded, priced, and scheduled independently.

If a lighting project is part of a room renovation, keep the room layout and the lighting savings as separate estimates. Area planning answers where fixtures and finishes belong, while the LED savings calculation answers how much electricity the replacement bulbs may avoid.

Group by bulb type next

After schedule, group by old wattage and replacement wattage. Ten 60-watt incandescent bulbs replaced by 9-watt LEDs form a clean group. Six 50-watt halogens replaced by 7-watt LEDs should be another group. This is more accurate than averaging old wattages across different fixtures, especially when some bulbs are halogen, some are incandescent, and some are already CFL or LED.

Choosing an electricity rate that matches the lights

Electricity rate choice can change the money result even when the kWh savings stay the same. If your bill has a flat per-kWh rate, the decision is straightforward. If your plan uses time-of-use pricing, tiered pricing, delivery charges, taxes, or demand charges, the best rate depends on what question you are asking. For a practical lighting estimate, use the cost that changes when those lights use less electricity.

Average rate versus marginal rate

Average rate is total bill divided by total kWh. It is easy to calculate and can be helpful for a broad household estimate. Marginal rate is the part of the bill that changes when you use one more or one fewer kWh. Fixed monthly fees do not usually disappear when you replace bulbs, so they may overstate savings if included too aggressively. For quick planning, many people use average rate; for conservative planning, use the variable energy rate.

When utility rates move over time, note the old rate and the new rate before applying the updated price to the same kWh savings. That keeps the rate change separate from the bulb efficiency change.

Peak and off-peak lighting

If lights run mainly in the evening, overnight, or during business hours, match the rate to that schedule. Exterior security lights may run at off-peak overnight rates, while retail lights may run during peak business-hour rates. Matching the rate to the actual schedule makes the estimate feel much closer to a real bill.

Payback, budget decisions, and upgrade priority

Payback helps answer a very human question: if I spend money on LED bulbs now, how long until the savings make that decision feel worthwhile? The fastest payback usually comes from replacing inefficient bulbs that run often. A rarely used bulb can still be worth replacing for light quality, safety, or convenience, but it may not be the first choice if the main goal is financial return.

Prioritize by payback, then by comfort

A practical upgrade order is to replace high-use, high-wattage bulbs first, then move to moderate-use areas, then low-use or specialty bulbs. This approach lets early savings help justify the rest of the project. It also gives you time to test brightness, color temperature, dimmer compatibility, and fixture fit before buying every bulb at once.

If an LED project is part of broader household budgeting after a raise or income change, the Pay Raise Calculator can help keep income planning separate from lighting energy savings.

Business payback needs operating context

For businesses, payback may include more than bulb cost. Labor to replace bulbs, lift rental, downtime, rebates, maintenance savings, and fixture compatibility can matter. A simple calculator is still useful because it gives a first-pass energy result, but a larger facility should treat that result as the beginning of the conversation rather than the final capital plan.

Reading LED packages without mixing up watts and lumens

LED packaging often combines several messages: actual watts, incandescent equivalent watts, lumens, color temperature, life hours, dimmability, and fixture restrictions. For savings, actual watts are the key number. For brightness, lumens are the key number. For comfort, color temperature and color rendering matter. Reading those values separately prevents a common mistake where a buyer chooses a bulb that saves energy but does not provide the light they actually wanted.

Equivalent watts are only a brightness shortcut

A package that says 60-watt equivalent does not mean the LED uses 60 watts. It usually means the LED is designed to replace the brightness of a traditional 60-watt incandescent bulb. The actual LED wattage may be around 8 to 10 watts. Enter the actual wattage into the calculator, then use lumens to decide whether the bulb is bright enough.

If you are comparing lighting efficiency with electric-vehicle style energy habits, the Miles per kWh Calculator shows a similar idea in another domain: useful output depends on how much work you get from each kWh.

Tips and tricks for better LED savings estimates

A good LED estimate is not about perfect precision. It is about using realistic inputs that match how the lights are actually used. If the estimate is for a home, walk through the rooms at the time the lights are normally on. If the estimate is for a business, ask which fixtures stay on before opening, during operating hours, after closing, and overnight. Real usage beats a tidy guess.

Use a small lighting audit

• Count bulbs by room or zone instead of guessing the whole property at once.
• Write down actual old wattage and actual LED wattage.
• Separate lights with different daily schedules.
• Use the rate that matches when the lights usually run.
• Include bulb cost only when you want payback or net savings.
• Test one or two bulb types before buying a large batch.

If the upgrade happens over several weeks or property visits, the Days Between Dates Calculator can help define the rollout window separately from the yearly savings estimate.

Watch for hidden non-energy benefits

LED upgrades can also reduce heat, lower replacement frequency, improve brightness, and make rooms feel more usable. Those benefits may not appear directly in the calculator, but they still matter. A garage that is finally bright enough to work in, or a shop that no longer needs frequent bulb changes, can be worth more than the energy line alone suggests.

Keep the assumptions visible

Write down the old watts, LED watts, hours, days, electricity rate, and bulb cost beside the result. If a utility rate changes or a room schedule changes later, you can update the estimate without starting from scratch.

Small habit

Take a photo of the old bulb label and the LED package before installing. It gives you a quick reference if you ever need to check wattage, color temperature, base type, or warranty details.

Connecting LED savings with other energy decisions

Lighting is often one of the easiest energy upgrades because the inputs are visible and the replacement is simple. But it is still only one part of an energy picture. A household may also compare appliance usage, heating and cooling settings, EV charging, work-from-home equipment, and outdoor lighting schedules. A small LED project can build the habit of thinking in kWh, dollars, and payback before moving on to larger decisions.

That same kWh habit is useful when comparing transportation energy. The Miles Per Gallon Equivalent Calculator translates EV energy use into a gasoline-equivalent comparison, which can make lighting savings and vehicle energy decisions feel less like separate languages.

For businesses, lighting savings can also affect staffing and operating assumptions. If longer store hours or overtime shifts change how long lights run, the Overtime Calculator can help keep labor planning separate from electricity savings.

Keep energy decisions in their own lanes

• For a home utility budget, track the lighting schedule and electricity rate separately.
• For business operations, group lighting by zone, shift, and operating calendar.
• For renovation planning, test brightness and color before making a full property purchase.
• For EV energy comparisons, keep vehicle efficiency, charging price, and lighting savings as separate kWh stories.
• For maintenance planning, include hard-to-reach fixtures and replacement frequency in the decision.

This separation makes the LED result easier to trust. You can update a rate, a schedule, or a bulb price without having to rebuild every other household or business energy estimate at the same time.

Planning a rollout and checking real savings later

The cleanest LED upgrade is often staged rather than rushed. A staged rollout gives you a chance to test brightness, color temperature, dimmer behavior, fixture fit, and the real schedule of the space before buying every bulb. This is especially helpful when a property has many fixture types or when several people use the same rooms. A bulb that looks perfect in a hallway may feel too cool in a bedroom, too dim in a kitchen, or too harsh in a waiting area.

Start with the lights that run the longest

A practical first pass is to upgrade the lights that are on most often. These are the bulbs most likely to prove the savings quickly. Kitchens, exterior fixtures, garages, offices, shops, hallways, signs, common areas, and task lighting often sit near the top of the list. Once those fixtures are converted, the savings can start while you continue testing lower-use areas at a calmer pace.

The second pass is usually about consistency and comfort. You may want all bulbs in one room to share the same color temperature and brightness, even if some of them have slower payback. This is a reasonable choice. The calculator helps with the energy side, but a lighting project also has a human side: rooms should feel comfortable, safe, and useful after the upgrade.

Track one before-and-after period

After a meaningful group of bulbs is replaced, it can be useful to compare one normal before period with one normal after period. The comparison will not be perfect because weather, appliance use, occupancy, and billing periods change, but it can still validate whether the estimate was in the right neighborhood. For a home, compare similar months if possible. For a business, compare similar operating weeks or similar seasons.

Do not expect the utility bill to show only the lighting change. Air conditioning, heating, refrigeration, cooking, laundry, computers, EV charging, and seasonal behavior can all move the bill at the same time. That is why kWh saved from the calculator is useful: it gives you a lighting-specific estimate even when the whole bill has many moving parts.

Check fit and fixture details before bulk buying

Compatibility matters more than people expect. Some LEDs are not rated for enclosed fixtures because heat can shorten their life. Some are not rated for damp locations. Some dim poorly on older dimmer switches. Some have a bulb shape that does not fit the shade, globe, can, or decorative fixture. Before buying a large quantity, test the exact model in the actual fixture for a few days.

If a fixture or bulb package lists dimensions in centimeters and your fixture clearance notes are in inches, the CM to Inches Converter can help verify physical fit before you order a full batch.

Small rollout habit

Keep the package from the first successful bulb until the project is finished. It preserves the exact wattage, lumens, color temperature, base, dimmer notes, and model number. If you need more bulbs later, you can match the successful choice instead of relying on memory or a vague description.

A staged approach also makes budget decisions easier. If the first group pays back quickly, you can decide whether to continue replacing lower-use bulbs for consistency, comfort, and maintenance rather than for pure energy savings. That distinction is important because a good lighting project is not only about the fastest financial return. It is also about making the space easier to live in, work in, and maintain.

When you revisit the calculator after the first stage, use what you learned. Replace rough hours with actual hours. Replace guessed LED prices with the price you really paid. Replace planned wattage with the wattage printed on the bulb you actually liked. Each update turns the estimate from a shopping guess into a more grounded property plan.

Finally, document the rooms that are already complete. A simple note such as kitchen complete, garage pending, porch tested, or office dimmer issue found can prevent duplicate purchases and confusion. LED upgrades are simple, but properties with many fixtures can still become messy when notes are scattered. A short rollout log keeps the project tidy and makes the final savings estimate easier to explain.

A final review should also separate financial savings from comfort improvements. Some bulbs will be replaced because the payback is obvious. Others may be replaced because the room feels better, the fixture is safer, the color is more pleasant, or the maintenance burden drops. Those reasons are valid, but they should not be mixed into the electricity-savings number. Keeping energy savings, purchase cost, maintenance convenience, and light quality as separate notes gives you a clearer decision. It also makes the calculator more useful later, because you can update one assumption without rewriting the whole story.

For example, a porch light that runs every night may be a strong energy decision, while a closet bulb may be mostly a convenience decision. A shop fixture may save money and improve visibility at the same time. A decorative lamp may be upgraded mainly for color consistency. When each reason is named clearly, the LED project feels less like a vague promise of savings and more like a set of practical choices that fit the way the space is actually used.

That is the best use of an LED savings estimate: not to pressure every bulb into the same decision, but to show which upgrades save energy, which improve daily use, and which deserve a little more testing before money is spent.

A clear estimate gives each lighting choice a practical reason.

How to Calculate LED Bulb Energy Savings

Use these steps to compare old bulb wattage with LED wattage, estimate yearly savings, and review payback time.

1. Enter the number of bulbs you plan to replace.
2. Enter the actual wattage of the old bulb and the actual wattage of the new LED bulb.
3. Add the typical hours per day and days per week the lights are used.
4. Enter the electricity cost per kWh using either cents or major currency units.
5. Optionally enter the LED bulb purchase cost to estimate simple payback.
6. Review weekly, monthly, yearly, and long-term savings before deciding which bulbs to replace first.

Frequently asked questions

How do I calculate LED energy savings?

Subtract the LED wattage from the old bulb wattage, multiply by the number of bulbs and annual hours, then divide by 1,000 to get kWh saved. Multiply kWh saved by your electricity rate to estimate money saved.

Should I enter LED equivalent watts or actual LED watts?

Enter actual LED watts, not the equivalent brightness claim. A package may say 60-watt equivalent, but the energy calculation needs the real wattage printed on the bulb or label, such as 8, 9, or 10 watts.

What LED replacement usually saves the most money?

The biggest savings usually come from high-wattage bulbs that run for many hours, such as exterior lights, kitchens, garages, shops, offices, and common areas. A rarely used lamp may save energy, but its payback will usually be slower.

Does the calculator include LED bulb purchase cost?

Yes, when you enter a price per LED bulb, the calculator can estimate total upfront cost, simple payback, and five-year net savings. If you leave bulb cost blank, it focuses on energy and bill savings only.

Why are my real savings different from the estimate?

Real savings can differ because lighting schedules, electricity rates, taxes, dimmer behavior, bulb wattage, and occupancy patterns change. The estimate is strongest when the wattage and usage hours match how the lights are actually used.

Can I use the same calculation for a business?

Yes. Businesses can use the same wattage, schedule, and kWh formulas, but they should group bulbs by operating zone. Sales floors, signage, offices, storage rooms, and exterior lights often have very different run times.

Do LEDs always pay for themselves quickly?

Not always. LEDs pay back fastest when they replace inefficient bulbs used often and when electricity prices are meaningful. If a bulb is rarely used or the replacement is expensive, the payback period may be much longer.

Should I replace CFL bulbs with LEDs too?

You can, but the savings may be smaller than replacing incandescent or halogen bulbs. CFLs already use less electricity than incandescent bulbs, so compare actual wattage, light quality, warm-up time, and replacement cost before deciding.

What else should I check before buying LEDs?

Check base type, lumens, color temperature, dimmer compatibility, fixture rating, damp or outdoor rating, and whether the bulb is approved for enclosed fixtures. A low-watt bulb is only a good choice if it works well in the actual fixture.

Final thoughts

LED upgrades are popular because they are easy to understand: lower wattage, similar or better brightness, and less electricity used over time. The biggest savings usually come from replacing high-wattage bulbs that run for many hours. The calculator helps identify those opportunities by showing both energy savings and cost savings in the same result panel.

Use the results as a planning estimate. If you enter realistic wattages, usage hours, and electricity rates, the calculator can give a practical view of yearly savings and payback time. For the most accurate plan, group bulbs by room or schedule, choose LEDs with appropriate lumens and compatibility, and update the electricity rate when your utility pricing changes.