All Calculators

Every WattCruncher tool in one place. All free, all instant.

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⚡ Home energy

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Electricity Bill CalculatorMonthly & yearly bill from kWh, rate, fees and tax.
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Appliance Running Cost CalculatorCost to run any device per hour, day, month, year.

🚗 Electric vehicles

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EV Charging Cost CalculatorHome charging cost, cost per mile, vs gas.
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EV vs Gas Savings CalculatorCost per mile and yearly savings, electric vs gas.

☀️ Solar

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Solar Panel Savings CalculatorSystem size, cost after credit, and payback.

Coming soon

We're adding new tools every week — home battery backup sizing, heat-pump savings, EV charging time, solar panel count, generator fuel cost, and a watts/amps/volts converter. Have one you'd like to see? Tell us.