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Free home & utility calculators

Simple, private calculators for household running costs. Every result comes with a plain-English explanation of how it was worked out.

Electricity Cost Calculator

See what an appliance actually costs to run per day, month and year.

How these calculators work

Each tool uses a standard formula that any electrician or energy supplier would recognise. Every page explains the formula and its limits.

Everything is calculated in your browser. The numbers you type in are not sent to our servers or stored.