About the Electricity Cost Calculator
Running cost is simply power multiplied by time multiplied by your unit rate. The only trap is that appliance labels quote peak power, not average — a fridge rated at 150 W only runs its compressor part of the time. Use the duty cycle field to allow for that and get a realistic figure.
Also known as: appliance running cost, cost to run appliance, kwh cost calculator, electricity bill calculator, power cost calculator, appliance-running-cost.
How to use this calculator
- Enter power rating, hours used per day, duty cycle, cost per kwh and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Open “Step-by-step” to see how the answer was worked out.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
cost = watts ÷ 1000 × hours × rate
Worked example
Using the values pre-filled in the calculator above:
- Power rating = 2,000 W
- Hours used per day = 2
- Duty cycle = 100 %
- Cost per kWh = 0.28
- Days per month used = 30
- Daily standing charge = 0
the calculator returns:
- Cost per day: 1.12
- Cost per hour: 0.56
- Cost per month: 33.6
- Cost per year: 408.8
Working
2,000 W × 100% = 2,000 W average2 kW × 2 h = 4 kWh per day