Electric heater electricity cost calculator

Calculate the running cost of portable heaters, panel heaters, oil-filled radiators, and other resistive electric heating.

Live calculation

Run your scenario.

Most resistive heaters convert purchased electricity into heat at the point of use. Cost depends mainly on power, runtime, thermostat cycling, and tariff.

Your reading

Planning range · based on your inputs

Estimated monthly cost$43.68

Likely planning range $39.31–$48.05

Per day$1.44

Per active hour$0.29

Per year$524.16

Energy / month242.7 kWh

FormulakW × runtime × tariff

Month52 weeks ÷ 12

Data qualitySelf-entered estimate

Transparent method

The calculation

Heating cost = heater kW × active hours × tariff

Most resistive heaters convert purchased electricity into heat at the point of use. Cost depends mainly on power, runtime, thermostat cycling, and tariff.

Read the full methodology →

Sensitivity check

Run three scenarios.

Short boostModel one or two active hours per day.

Thermostat-controlledUse a 50%–80% active-runtime range.

Continuous demandUse 100% only if the element truly stays on.

Use the result well

What can change the answer?

Equal-wattage resistive heaters cost roughly the same while active.
Comfort and runtime still differ with insulation and heat delivery.
Heat pumps require a different efficiency model.

Electric heater electricity cost calculator

Run your scenario.

The calculation

Run three scenarios.

What can change the answer?

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