How this calculator works
Enter your own flat energy rate in your chosen currency. This estimate excludes fixed charges, taxes and tiered tariffs. Appliances that cycle on and off may use less than their nameplate power over the same elapsed time.
The formula
kWh = watts × hours / 1,000
Cost = kWh × entered rateA quick example
1,000 W for 1 hour uses 1 kWh. At 0.20 per kWh, that is 0.20 daily or 6.00 over 30 days.
How to use this calculator
- Enter the labeled values, using a decimal point for fractions.
- Check the units and assumptions.
- Calculate, review the result and copy it if needed.
A few common questions
How is this result calculated?
kWh = watts × hours / 1,000
Cost = kWh × entered rate
What assumptions should I check?
Enter your own flat energy rate in your chosen currency. This estimate excludes fixed charges, taxes and tiered tariffs. Appliances that cycle on and off may use less than their nameplate power over the same elapsed time.
Can I see a worked example?
1,000 W for 1 hour uses 1 kWh. At 0.20 per kWh, that is 0.20 daily or 6.00 over 30 days.