Microwave Electricity Cost Calculator
Calculate microwave electricity cost per use, month, and year using input watts and minutes.
Calculate microwave running cost
How this calculator works
Microwave cooking output—such as 1,000 watts—is not the same as electrical input. Use the higher input wattage shown on the appliance label for an electricity-cost estimate.
Short operating times usually make each use inexpensive. Standby clock power is not included and can be estimated separately with the standby-power calculator.
A 1,500-watt microwave running six minutes at $0.18/kWh costs about $0.03 per use.
How to get a more accurate estimate
- Use input power from the electrical label, not advertised cooking output.
- Enter total heating minutes, including repeated short runs.
- Estimate clock and standby use separately if you want a whole-year total.
Frequently asked questions
Why is input wattage higher than cooking wattage?
Conversion losses, fans, controls, and other components make electrical input higher than delivered microwave output.
Is a microwave cheaper than an oven?
For small portions and short heating times it often uses less total energy, but the comparison depends on food and appliance efficiency.
Does reduced power lower energy use proportionally?
Many microwaves cycle full power on and off, so total energy depends mainly on the selected level and total elapsed time.
Results use the values you enter and the formula shown above. Real bills can include taxes, minimum charges, tiers, time-of-use pricing, cycling losses, and other adjustments. Use a recent bill or a plug-in energy meter when accuracy matters.