Free & Source-Backed
Home Energy Calculators
You Can Trust
Estimate your electricity bill, EV charging cost, solar payback, and appliance running costs. No email required. Every formula shown. Every source cited.
24 Calculators Across 6 Categories
Electricity
Bill calculator, kWh cost, appliance energy, phantom load
4 calculators →
Heating & Cooling
Heat pump vs furnace, AC cost, space heater, smart thermostat
4 calculators →
Solar
Panel size estimator, payback calculator
2 calculators →
EV Charging
Home charging cost, Level 1 vs Level 2 comparison
2 calculators →
Appliances
Fridge, water heater, dryer, washer, dishwasher, LED vs incandescent
6 calculators →
Insulation & Windows
R-value, window heat loss, ceiling fan vs AC, pool pump, hot tub, generator
6 calculators →
Every formula shown
We don't hide the math. Every calculator explains how it works.
Official sources cited
EIA, DOE, ENERGY STAR, Ofgem, NRCan, AER — verified quarterly.
No email required
Your result appears instantly. We never gate answers behind a form.
Popular Calculators
Jump straight into the most-used tools.