Free EV Calculators
Fast, accurate calculators for EV charging cost, range, total cost of ownership, depreciation, savings vs gas, the federal tax credit, home charger sizing — and 20 more. No sign-up, no tracking, no apps. Everything runs right here in your browser.
Most popular
Quick start with the calculators most first-time visitors find useful.
EV vs Gas Savings Calculator
Compare what you would spend on fuel each year with an EV versus a gas car.
Open tool →EV Total Cost of Ownership Calculator
The full 5- or 10-year cost of owning an EV vs a gas car — purchase, fuel, maintenance, insurance, and depreciation in one number.
Open tool →EV Charging Cost Calculator
Work out exactly what it costs to charge your EV from any percentage to any other.
Open tool →EV Range Calculator
Estimate the real-world driving range of an EV from its battery, efficiency and the weather.
Open tool →EV Cost Per Mile Calculator
Compare what each mile actually costs in an EV versus a gas car, at your local rates.
Open tool →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 →EV Charging Speed Calculator
See how many miles of range a charger adds per hour — the most intuitive way to think about charging speed.
Open tool →DC Fast Charging Session Cost
See what a single DC fast-charge session costs, and how much extra you pay over home charging.
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 →kW ↔ Amps Converter
Convert between kilowatts and amps at any voltage — useful for sizing chargers, wires and breakers.
Open tool →EV Solar Panel Calculator
Find out how many solar panels it takes to cover a year of EV driving with sunshine.
Open tool →EV Time-of-Use Charging Savings
See how much an off-peak electricity plan saves over a flat rate when you charge mostly overnight.
Open tool →EV Daily Energy Need Calculator
See how much electricity your EV actually uses per day, week, month and year.
Open tool →Range
EV Range Calculator
Estimate the real-world driving range of an EV from its battery, efficiency and the weather.
Open tool →Highway Speed Range Impact
See how much range an EV loses at highway speeds — aerodynamic drag is the biggest enemy of range.
Open tool →MPGe & Efficiency Converter
Convert between mi/kWh, kWh per 100 miles, and MPGe — the three units used to describe EV efficiency.
Open tool →Road Trip Charging Stops
Estimate how many charging stops and how much total time a long EV road trip will take.
Open tool →EV Battery Degradation Estimator
Estimate how much battery capacity a used EV has lost based on its age and miles.
Open tool →EV Battery Replacement Cost
Estimate what it would cost to replace an EV battery pack, by battery size and per-kWh price.
Open tool →EV Charging Frequency Calculator
See how often you actually need to plug in based on your weekly miles and charging habits.
Open tool →EV Comparison Tool
Compare any two popular 2025/2026 EVs side by side — range, efficiency, charging speed, MSRP, and 5-year running cost.
Open tool →Savings
EV vs Gas Savings Calculator
Compare what you would spend on fuel each year with an EV versus a gas car.
Open tool →EV Cost Per Mile Calculator
Compare what each mile actually costs in an EV versus a gas car, at your local rates.
Open tool →EV CO₂ Emissions Savings
See how much carbon dioxide an EV saves over a gas car each year, at any grid mix.
Open tool →EV Break-Even Calculator
Work out how many years until an EV pays back its price premium over a comparable gas car.
Open tool →EV Loan Monthly Payment Calculator
Work out your monthly payment, total interest and total cost on an EV loan.
Open tool →EV Lease vs Buy Calculator
Compare the 3-year cost of leasing an EV versus buying — including the value you walk away with.
Open tool →EV Resale Value Estimator
Estimate the current resale value of a used EV from its original price, age and miles driven.
Open tool →EV Annual Maintenance Cost
Compare what you would spend on maintenance each year with an EV versus a gas car.
Open tool →EV Trip Cost Calculator
Work out the fuel cost of any specific trip in an EV — and how much you save versus a gas car.
Open tool →EV Total Cost of Ownership Calculator
The full 5- or 10-year cost of owning an EV vs a gas car — purchase, fuel, maintenance, insurance, and depreciation in one number.
Open tool →Latest guides
EV winter checklist: pre-winter prep and daily routine
A practical pre-winter checklist for EV owners — tire prep, software setup, charging routine, on-the-road tips, and what not to do. Print-friendly action list at the end.
EV one-pedal driving explained: how it works and how to use it
What one-pedal driving actually is, how it extends range and saves brake wear, the terminology each manufacturer uses, how to enable it on every major EV, and how to learn it without making passengers seasick.
EV charging connector types in 2026: NACS, CCS1, J1772, CHAdeMO explained
The four EV charging connectors you will encounter in North America in 2026 — what each one looks like, what it does, which adapters connect to which, and how the NACS transition has settled out.
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.
Frequently asked
Are these calculators free?
Yes — every calculator on this site is completely free to use. No sign-up, no paywall. The site is supported by unobtrusive display ads.
Do you save the numbers I enter?
No. Every calculator runs entirely in your browser. The numbers you type — battery sizes, miles, dollar amounts — never leave your device.
How accurate are the calculators?
We work hard to keep them correct, but they're for planning and estimation. Real-world EV performance varies with temperature, driving style, terrain and battery age. Always verify critical numbers against your specific vehicle.
Which calculator should I start with?
For a quick comparison with your current gas car, try the EV vs Gas Savings Calculator. To answer "how much will charging cost me," start with the EV Charging Cost Calculator. New EV owners often start with the Charging Time Calculator and Range Calculator.
Can I suggest a calculator?
Yes, please do — send your idea via our contact page. We add tools based on what people actually need.