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Cost · Energy
LED running cost calculator
Use the wattage on the label, your schedule, and your local electricity price to estimate energy and cost.
- Question
- What does it cost to run these LED lights?
- Runs
- Locally in this browser
- Reviewed
- 2026-08-06
Live result
Estimated annual running cost$18.92
105.12 kWh per year at the entered schedule and rate.
Connected load72 W
Daily energy0.29 kWh
Monthly energy8.76 kWh
Monthly cost$1.58
Arithmetic estimate only. Taxes, tiered rates, standby power, dimming, and future rate changes are not modeled.
From number to decision
Measure.
Read. Verify.
Eight 9 W lamps used 4 hours daily consume about 105.1 kWh each year. At 0.18 per kWh, that is about 18.92 in the entered currency.
Measure
- Use input watts from the actual lamp or integrated fixture specification.
- Count sources on the same schedule and estimate realistic daily operating time.
- Read your utility price per kWh and note whether taxes or tiers are excluded.
Read
- Connected load is watts multiplied by quantity.
- Energy is connected kilowatts multiplied by operating hours.
- Cost applies the exact rate you entered; the dollar sign is a display convention.
Verify
- Dimming and occupancy schedules
- Standby power in drivers and smart controls
- Tiered tariffs, taxes, demand charges, and seasonal rate changes
The visible method
kWh = watts × quantity × hours ÷ 1,000
LimitThis is an arithmetic estimate. It excludes dimming curves, standby draw, demand charges, taxes, rate tiers, and future price changes.
Results are computed from the fields you enter. Glow & Gauge does not infer a product, electricity rate, room reflectance, or professional approval.
Read the site-wide methodStarting references
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