Calculator library

All Home Energy Calculators

Choose a focused calculator, enter your own appliance details and tariff, and inspect the formula behind each estimate.

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Estimate kWh and cost from wattage and daily runtime.

Build an appliance inventory and rank estimated household use.

Model cycling and estimate monthly cost.

Compare wattage, energy savings, and simple payback.

Estimate devices left in standby or sleep mode.

Separate self-used solar generation from exported energy.

Compare two appliances by energy and cost.

Estimate peak and off-peak charges.

Calculators run in your browser. They are estimates and do not automatically include every utility charge, tax, or tariff rule.