Energy workbench
Quantify energy use and operating cost from numbers you already have.
Quantify energy use, operating cost, and charging math in your browser. Enter your own rates. Results are estimates, not utility bills or energy audits.
Calculators run in this browser. They are estimates — not utility bills, engineering certifications, or professional energy audits.
Operating cost
Electricity Cost Calculator
Multiply energy you already know in kilowatt-hours by the dollars-per-kWh on your bill. Use this when a meter, EnergyGuide label, or another calculator already gave you kWh.
Energy use
kWh Calculator
Kilowatt-hours are power times time. Enter watts or kilowatts and how long the load runs. Optionally price the energy with your own rate.
Operating cost
Appliance Energy Cost Calculator
Use this when you know an appliance’s watts and how often you run it. The page annualizes with a disclosed calendar convention and your bill rate.
Charging
EV Charging Calculator
Price one charging session and estimate how long it takes. Enter energy delivered to the battery, an efficiency loss, your electricity rate, and charger power. This is not a gas-versus-electric decision page.
Operating cost
Standby Power Cost Calculator
Always-on boxes, clocks, and idle chargers draw a few watts all day. This page prices that idle draw. It is not a general appliance scheduler.
Energy use
Battery Runtime Calculator
Runtime is usable energy divided by load. Enter the kilowatt-hours you can actually draw and the watts or kilowatts the load uses. This is not a home-battery installation price.
Operating cost
LED Savings Calculator
Enter the existing wattage, the replacement wattage, hours per day, and your bill rate. The page prices the yearly energy difference. It is not a second appliance scheduler.
Energy use
Turn watts and hours into kilowatt-hours.
Operating cost
Estimate dollars from energy and your own rate.
Charging
Session cost and time from delivered kWh and charger power.