Energy Calculators
Free energy calculators for electricity costs, EV charging, solar ROI, heat pumps, carbon footprint, and appliance energy.
27 free tools available
Browse in-depth energy calculators guides
Appliance Energy Calculator
Calculate the energy cost of running appliances.
Battery Capacity Calculator
Calculate battery runtime and Watt-hours.
Battery Charge Time Calculator
Estimate how long it takes to charge a battery from capacity and charge current.
Battery Life Calculator
Estimate battery runtime based on capacity and device power draw.
Carbon Footprint Calculator
Estimate your annual carbon footprint from electricity usage.
Carbon Offset Calculator
Estimate carbon offset cost for flights, driving, and home energy use.
Electricity Cost Calculator
Estimate your monthly electricity bill based on usage and rate.
Energy Consumption Calculator
Estimate daily, monthly, and annual energy use of appliances and electronics.
EV Charging Cost Calculator
Calculate the cost to charge your electric vehicle at home or public stations.
EV Charging Time Calculator
Estimate how long it takes to charge an electric vehicle based on battery size and charger power.
EV Range Calculator
Estimate electric vehicle range based on battery capacity and efficiency.
Fuel Efficiency Calculator
Convert between MPG, L/100km, and km/L to compare vehicle fuel efficiency.
Heat Pump Savings Calculator
Estimate savings by switching from gas/oil heating to a heat pump.
Heat Pump Savings Calculator
Estimate annual heating cost savings from switching to a heat pump.
Horsepower Calculator
Convert between mechanical horsepower, metric horsepower, and kilowatts.
Induction vs Gas Cooking Cost Calculator
Compare the energy cost of cooking with induction versus natural gas.
LED Energy Savings Calculator
Compare annual energy costs of LED bulbs versus incandescent or CFL bulbs.
LED Savings Calculator
Calculate savings by switching from incandescent to LED bulbs.
Ohm Law Calculator
Calculate voltage, current, resistance, or power using Ohm law.
RPM Calculator
Calculate revolutions per minute from frequency or linear speed.
Solar Panel Calculator
Estimate solar panel system size, cost, and savings for your home.
Solar Panel Output Calculator
Estimate daily energy output from a solar panel based on wattage and peak sun hours.
Solar Payback Calculator
Estimate how many years it takes for solar panels to pay for themselves.
Solar ROI Calculator
Calculate the return on investment for installing solar panels.
Solar Savings Calculator
Estimate annual savings and payback period from installing solar panels.
Torque Calculator
Calculate torque from force and distance or power and rotational speed.
Wind Turbine Power Calculator
Estimate theoretical wind turbine power output from wind speed and rotor area.