LED Savings Calculator — Energy & Cost Savings from Switching to LED
Find out exactly how much you save by switching to LED bulbs: enter your old bulb wattage, the LED replacement wattage, daily usage hours, electricity price per kWh, number of bulbs, and the upfront LED cost — and get annual savings, payback period, and a 10-year projection.
W
W
hrs/day
$/kWh
bulbs
$
Money saved on electricity per year by switching all bulbs to LED
- 1
Hours of use per year
4 × 365 = 1,460 hrs - 2
Energy saved per bulb per year
(60 − 9) ÷ 1000 × 1,460 = 74.46 kWh - 3
Annual savings (all bulbs)
74.46 × 0.13 × 10 = 96.80kWh saved per bulb multiplied by the electricity rate and number of bulbs.
How does this calculator work?
Annual savings = (old wattage − LED wattage) ÷ 1000 × hours/day × 365 × $/kWh × number of bulbs. Payback = upfront LED cost ÷ annual savings. A 60 W → 9 W swap at $0.13/kWh for 4 hrs/day saves roughly $9.65/bulb/year with a payback under 1 year.
Formula
How this is calculated
LED bulbs use 70–90% less electricity than equivalent incandescent bulbs. The savings come from the wattage difference: a 60 W incandescent replaced by a 9 W LED saves 51 W every hour it runs. Multiply that by daily hours, 365 days, your electricity rate per kWh, and the number of bulbs to get the annual cost saving.
The payback period tells you how many years it takes for the cumulative electricity savings to cover the upfront cost of the LED bulbs. After payback, every dollar saved is pure gain. The 10-year net savings combines a decade of annual savings minus the initial investment — useful for comparing LED brands or wattages.
The CO₂ estimate uses a grid emission factor of approximately 0.386 kg CO₂/kWh (US average, 2024 estimate — edit the electricity price field to explore different scenarios). Actual savings depend on your local grid mix, utility rate, and daily usage patterns.
Frequently asked questions
A single 60 W incandescent replaced by a 9 W LED used 4 hours per day at $0.13/kWh saves roughly $9.65 per year in electricity. Over 10 bulbs that is about $96.50 per year — enough to pay back a set of $5 LED bulbs in around 6 months.
Yes — LED bulbs are rated for 15,000–25,000 hours compared to 1,000 hours for a standard incandescent and 2,000 for a halogen. This calculator focuses on electricity cost; bulb-replacement savings add further value not reflected in the numbers above.
Check your electricity bill — the cost per kWh is usually shown in the rate or usage section. US residential rates in 2025 average around $0.13–$0.17/kWh; European rates vary widely from €0.10 in some countries to over €0.35 in others.
TG we-Calculate Editorial Team. (2026). LED Savings Calculator — Energy & Cost Savings from Switching to LED [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/led-savings-calculator
TG we-Calculate Editorial Team. "LED Savings Calculator — Energy & Cost Savings from Switching to LED." TG we-Calculate. 2026. https://we-calculate.com/calculator/led-savings-calculator.
TG we-Calculate Editorial Team, "LED Savings Calculator — Energy & Cost Savings from Switching to LED," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/led-savings-calculator
@misc{wecalculate_led_savings_calculator, title = {LED Savings Calculator — Energy & Cost Savings from Switching to LED}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/led-savings-calculator}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?