Free home energy calculators
Six calculators that show their working. No sign-up, nothing sent anywhere — everything runs in your browser, in your currency.
Solar savings calculator
System size, net cost, payback and 25-year cash flow.
Open →Heat pump savings calculator
Gas, oil, propane or resistance heat vs a heat pump.
Open →EV vs gas cost calculator
Per-mile, annual and 10-year running costs.
Open →Appliance energy cost calculator
Rank every device by what it costs you.
Open →Home battery sizer
kWh, kW and battery count for outage backup.
Open →Home Energy Score
A 0–100 score and your top six upgrades.
Open →Built for real decisions
Most online calculators hide their assumptions or ask for your phone number before showing a result. Ours list every assumption under the result, let you edit it, and never ask for contact details to show you an answer.
When you're ready to turn an estimate into a real price, our free quote service connects you with up to three vetted local installers.
Get real quotes for your home
Compare up to 3 vetted local installers. Free, no obligation, about 2 minutes.
No spam. You choose who contacts you.