Electricity Calculator

Estimate what an appliance adds to your power bill. Enter its power rating in watts, the hours used per day, the number of days and your tariff per kWh.

How to use the Electricity Calculator

  1. Enter appliance wattage.
  2. Enter hours, days and tariff.
  3. Read kWh and cost.

How it works

Formulas: Energy (kWh) = Watts × Hours × Days ÷ 1000; Cost = kWh × Tariff.

Worked example

A 1,500 W heater used 4 h/day for 30 days uses 180 kWh; at 8 per kWh that costs 1,440.

Good to know

Real bills may have slab rates, fixed charges and taxes, so treat the result as an estimate.

Frequently asked questions

On the appliance label or manual.

No; add standby watts × idle hours separately.

Results are estimates for information only and are not financial, tax or legal advice.