Tools · run in your browser
Electricity calculators
Most calculators make you dig your rate off your bill first. Ours don't — pick your utility and we pre-fill its current rate for you, across all 9 states we track. Everything runs in your browser; nothing you type is sent anywhere, and we take no supplier commissions.
Electricity cost calculator
Turn kWh into dollars at your utility's real rate — per day, month, or year.
kWh cost calculator
See exactly what one kilowatt-hour costs on your utility, and how utilities compare.
Appliance running-cost calculator
What it costs to run an AC, dryer, fridge, space heater and more — at your rate.
Electrical converters (watts, amps, volts)
Watts to amps, amps to watts, kW to amps and more — with 120V/240V tables and breaker-safety guidance.
What does it cost to run…
Each one priced at your utility's real rate, with the wattage facts and how to cut the cost.
Wondering why the bill jumped in the first place?