Free global electricity-cost calculators

Know what it costs before you plug it in.

Calculate, compare, and reduce the running cost of anything powered by electricity—using your tariff, your currency, and your real life.

Run the numbers ↓Browse all 12 calculators

0112 focused calculators

Use a model that matches how the appliance actually behaves.

0211 verified markets

Start with a current official reference, then edit it for your bill.

03Honest estimates

Every result shows the formula and assumptions instead of hiding them.

Global calculator · any currency

Turn usage into a decision.

Start with a label or best estimate. PowerCost Lab separates what you entered from what it inferred, so an estimate never pretends to be a measurement.

Your reading

Planning estimate · based on your inputs

Estimated monthly cost$2.62

Likely planning range $2.36–$2.88

Per day$0.09

Per active hour$0.02

Per year$31.45

Energy / month14.6 kWh

FormulakW × runtime × tariff

Month52 weeks ÷ 12

Data qualitySelf-entered estimate

One engine · twelve real-world models

Electricity behaves differently in different devices.

An AC cycles. An EV loses energy while charging. A standby device runs for nearly the entire day. Choose the calculator that exposes the assumption most likely to change your result.

Browse every calculator →

Any applianceCalculate the hourly, daily, monthly, and annual cost of any electrical appliance using its wattage, runtime, and your own electricity rate.

↗02

Air conditionerEstimate AC running cost with compressor duty cycle, daily runtime, seasonal usage, currency, and your local electricity tariff.

↗03

RefrigeratorEstimate refrigerator or freezer running cost while accounting for compressor cycling rather than assuming full power all day.

↗04

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

↗05

Water heaterEstimate the cost of an electric storage water heater, immersion heater, instant heater, or geyser using power, heating time, and tariff.

↗06

Washing machineEstimate washing-machine electricity cost per month and year from cycle duration, power, load frequency, and your tariff.

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Global architecture · local inputs

Start with the market you pay in.

Thirty localized calculators load a current official reference where one is verified, explain its exact market scope, and keep the rate editable for your own bill.

Explore country electricity costs →

Original evidence underneath the utility

Useful today. More accurate as measurements grow.

The free calculators work without an account or contribution. Separately, explicitly contributed real-world measurements can improve future device and climate benchmarks without selling personal household profiles.

See how estimates and evidence stay separate →

Field notes

Better inputs. Better decisions.

Short, practical explanations for the assumptions that change an energy estimate most.

Guide 01

Twelve focused tools · one transparent method

Turn the next electricity-cost question into a number.

Choose a calculator ↗

Know what it costs before you plug it in.

Turn usage into a decision.

Electricity behaves differently in different devices.

Start with the market you pay in.

Useful today. More accurate as measurements grow.

Better inputs. Better decisions.

Read your electricity bill

Measure with a smart plug

Understand duty cycle

Reduce cooling cost

Compare appliance payback

Turn the next electricity-cost question into a number.