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Electricity cost calculator

Estimate electricity use and cost by device, load and tariff for a fixed duration or daily to yearly periods.

Get started

  1. Enter the device’s electrical power, use and tariff. Device presets fill editable example values.

Example

Input

1,000 W, 2 h/day, 30 days, 0.2 per kWh

Expected result

60 kWh, cost 12

Try it

Good to know

The calculation runs in your browser. Use consistent units in fields with no explicit unit.

Calculation method

Energy equals kW times operating hours, average load and device count. Cost uses a flat tariff. Period estimates use 30.44 days per month and 365.25 per year. A cooling rating describes heat moved; use electrical input power for billing.

EkWh=PkW th f n,C=EkWh rE_{\rm kWh}=P_{\rm kW}\,t_{\rm h}\,f\,n,\qquad C=E_{\rm kWh}\,r

Calculation mode

Fixed days
  • Power
  • Power unit · W / kW / BTU/h / PS / TR
  • Average load · %
  • Devices
  • Hours per day · h
  • Days
  • Cost per kWh
Daily to yearly estimates
  • Appliance preset
  • Power
  • Power unit · W / kW / BTU/h / PS / TR
  • Average load · %
  • Devices
  • Usage
  • Usage unit · Minutes per day / Hours per day / Hours per week / Hours per month / Days per week / Days per month / Days per year / Months per year
  • Cost per kWh