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Electricity Cost Calculator

Estimate daily energy use and cost from power, runtime, and your electricity rate.

01 / INPUTS

W
h/day
/kWh

02 / RESULT

30-DAY COST

45

Energy per day
10 kWh
Cost per day
1.5
Cost per 30 days
45

Calculation trace

  1. (1,000 W ÷ 1000) × 10 h = 10 kWh
    10 kWh
    Daily energy
  2. 10 kWh × 0.15 per kWh = 1.5
    1.5
    Daily cost
  3. 1.5 × 30 days = 45
    45
    30-day cost
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How it works

Daily energy = (watts ÷ 1000) × hours per day; daily cost = energy × your rate; monthly cost ≈ daily × 30.

Assumptions & limits

  • The electricity rate (per kWh) is user-supplied.
  • A month is approximated as 30 days.
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FAQ

Why is the month 30 days?
It is a round approximation for a quick monthly estimate; multiply daily cost by the exact days for precision.
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