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Everyday

LED electricity cost calculator

Calculate the annual energy use and cost of your LED lights.

Your result

Complete the fields and calculate.

Calculation method and formula

Number of LED lights × Power per light [W] ÷ 1000 × Hours on per day [h] × 365 × Price per kWh

Understand the inputs

Number of LED lights
Minimum 1. Whole number.
Power per light
Unit: W. Use a measured value or your own assumption.
Hours on per day
Unit: h. Use a measured value or your own assumption.
Price per kWh
Use a measured value or your own assumption.

Assumptions and limitations

Energy in kWh is not power in W or kW. Use measured average power or the stated annual consumption; include standby and fixed charges separately when supported.

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

Worked example

Illustrative values. Replace them with your own inputs for your calculation.

Number of LED lights
10
Power per light
8 W
Hours on per day
5 h
Price per kWh
0.35
Example result51.1 per year

Annual use: 146 kWh.

Model revision: October 17, 2026 · How CleverCalc works

FAQ

Frequently asked questions

How does LED electricity cost calculator work?+

Number of LED lights × Power per light [W] ÷ 1000 × Hours on per day [h] × 365 × Price per kWh. Energy in kWh is not power in W or kW. Use measured average power or the stated annual consumption; include standby and fixed charges separately when supported.

What assumptions should I consider for this result?+

Energy in kWh is not power in W or kW. Use measured average power or the stated annual consumption; include standby and fixed charges separately when supported. The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation.

How accurate is the result?+

The formula uses the specified units. Displayed numbers are rounded; whole packs, item counts and full time periods may also be rounded within the calculation. Prices, measurements and model assumptions determine how well the result represents your situation.

Is this calculator free?+

Yes. Calculations and PDF export work without an account or registration.

What happens to my inputs?+

Calculations run in your browser. Results are saved locally only when you add them to My results; favourites and history are also local. Shared links contain your values. The currency tool requests the selected currencies from its rate provider without sending your amount.

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