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WattItCost
Space Heater Running Cost Calculator
How much does your heater add to your bill?
Free to use on your site. Please keep the credit link.
Space Heater Electricity Cost Calculator
Private inputs and transparent assumptions
WattItCost is an independent project. No account is required, household inputs stay in your browser, and estimates show their assumptions and limitations.
About WattItCostSpace Heater Running Cost Calculator
How much does your heater add to your bill?
vs Central Heating
Compare one room-heater estimate with a central-heating cost you enter
Heater Size Guide
Estimate a room heat-load range and check portable-heater limits
Space Heater Type Comparison
Compare equal-watt cost, comfort, controls, and heat delivery
Dehumidifier Running Cost Calculator
Estimate electricity cost from your entered use
Dehumidifier Size Calculator
Explore a capacity range for your room conditions