All Energy Calculators

24 free calculators. Every formula shown. Every source cited. No email required.

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Electricity

Electricity Bill Calculator → kWh Cost Calculator → Appliance Energy Cost → Phantom Load Calculator →

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Heating & Cooling

Heat Pump vs Furnace → Air Conditioner Cost → Space Heater Cost → Smart Thermostat Savings →

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Solar

Solar Panel Size Estimator → Solar Payback Calculator →

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EV Charging

EV Home Charging Cost → Level 1 vs Level 2 Charger →

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Appliances

Refrigerator Running Cost → Water Heater Cost → Clothes Dryer Cost → Washing Machine Cost → Dishwasher Cost → LED vs Incandescent →

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Insulation & Windows

R-Value Calculator → Window Heat Loss → Ceiling Fan vs AC → Pool Pump Cost → Hot Tub Cost → Generator Fuel Cost →