Free EV Calculators
Fast, accurate calculators for charging cost, range, charging time, EV vs gas savings, and home charger sizing. No sign-up, no apps — everything runs right here in your browser.
Charging
EV Charging Cost Calculator
Work out exactly what it costs to charge your EV from any percentage to any other.
Open tool →EV Charging Time Calculator
See how long a charge will take, at home or on a public charger, for any battery and charger.
Open tool →Home Charger Amp & Breaker Calculator
Find the amp draw, breaker size and wire gauge needed to install a home Level 2 EV charger.
Open tool →Range
Savings
About these calculators
ChargeMath is a growing collection of free calculators for EV owners and anyone curious about going electric. Whether you are checking what a charge will cost, planning a road trip, or comparing your savings against a gas car, the goal is always the same: a clear, reliable answer in seconds.
Every calculator runs entirely in your browser, so there is nothing to install and your numbers never leave your device. Bookmark the tools you use most often, and check back as we add new ones.