iPhone & iPad · 186+ EVs · Works offline

20% to 80%? Know the kWh before you plug in.

Pick your car. Slide your battery. See the kWh you need, a realistic DC fast charge time, and what it will cost — instantly, with no Googling your battery size and no mental math at the charger.

Download on the App Store
$1.99 once. No subscription. No ads. No account.
186+EV models
36makes
5-stepDC taper curve
Meet Volt. 15 seconds, sound on.
Try the math — right here

The same calculator, running in your browser.

Same 186-car database, same taper model as the app. Go ahead, pick your car.

Battery · 20% → 80%
Charger
45.0 kWh
Energy added
13 min
Est. time
$21.60
Est. cost
The app adds saved vehicles, 7-source cost comparison, 36 currencies, and quick scenarios. Get it for $1.99 →
Why EV owners keep it on the home screen

Every charging question, answered in three taps.

Public chargers bill by the kWh. Fast chargers slow down past 50%. Your car caps the speed. The app knows all of it, so you don't have to.

Select Vehicle list showing Acura and Audi models with usable kWh, AC and DC charge rates
186+ cars, built in

Stop Googling "Model Y battery size."

Tesla to Xpeng, 36 makes, with the usable battery capacity — not the marketing number — plus each car's max AC and DC charge rate. Search, tap, done.

Driving something rare or modded? Add a custom vehicle with any battery size, and save up to five cars for quick switching in multi-EV households.

Realistic fast-charge times

Not "kWh ÷ kW". A real taper curve.

Every EV slows down as it fills. The app models DC fast charging in five segments — full speed from 20–50%, backing off to 75%, then 40%, then 20% near full — so "17 minutes" actually means seventeen minutes.

And when your car is the bottleneck, it says so: "Limited by vehicle max" appears the moment a 350 kW charger meets a 150 kW car.

0%20508090100%
Calculator screen: 20% to 86% adds 65.7 kWh in 17 minutes on a 350 kW DC fast charger
Cost comparison across home off-peak, on-peak, workplace, public L2 and DC fast rates
Settings with electricity rate, currency and distance unit
Home vs. public, side by side

See what the same charge costs everywhere.

One tap compares your session across home off-peak, home on-peak, workplace, public Level 2, Tesla Supercharger, and other DC fast networks — with your own rates, in any of 36 currencies.

Commas or dots, miles or kilometers: it follows your phone's settings everywhere.

EV kWh Calculator on iPad in light mode
Dark by default. Light when you want it. Made for iPhone and iPad.
4 taps
Quick scenarios
Overnight Home, Road Trip Top-Up, Full Charge, Emergency Top-Up — one tap sets the range and charger for the moment you're in.
10
Charger presets
Level 1 wall outlets to 350 kW DC, plus a custom charger for whatever's actually on the post in front of you.
0 bars
Signal required
Parking garages and rural chargers are dead zones. Every car, every formula lives on your phone.
Yours, privately

No account. No tracking. No internet needed.

Your car, your charging habits, and your rates are nobody's business. The App Store privacy label reads "Data Not Collected" — and we mean it.

Works fully offline
Zero data collected
No ads, no analytics
No sign-up, ever

Pay once. Calculate forever.

Less than the price of four kilowatt-hours at a DC fast charger.

EV kWh Calculator
$1.99
once.
Every car. Every charger. Every future update. No in-app purchases, no premium tier, no subscription.
Download on the App Store
What charging without it usually costs
Guessing at the charger
Sitting past 80% while the taper crawls — and paying per kWh for it
$$$
Googling your battery size
Gross vs. usable, three model years, five forum threads
10 min
Phone calculator math
kWh ÷ kW — wrong the moment you pass 50%
"close"
EV kWh Calculator
The right number, before you plug in
$1.99 once

Questions from the charging stall

Is my car in there?

Very likely. 186+ models across Tesla, Hyundai, Kia, Ford, Chevrolet, BMW, Mercedes-Benz, Audi, Volkswagen, Rivian, Lucid, Porsche, Nissan, Toyota, Volvo, Polestar, BYD, Genesis, Xiaomi, Xpeng and more. If not, add it as a custom vehicle with any battery size.

How accurate are the charge times?

DC fast charging uses a five-segment taper curve that reflects how real batteries slow down as they fill, capped at your car's max charge rate. It's an estimate — temperature, battery condition, and each car's specific curve all matter — but it's far closer than simple kWh ÷ kW.

Does it work without internet?

Completely. The vehicle database and every calculation live on your device. No connection needed, ever.

Can I use my own electricity rates and currency?

Yes. Set your own rate per kWh for home, workplace, and public charging, choose from 36 currencies, and switch between miles and kilometers.

Is $1.99 really the whole price?

Yes. One purchase, every feature, every future update. No subscription, no in-app purchases, no ads.

Plug in with confidence.

Know the kWh, the minutes, and the money — before the cable clicks in.

Download on the App Store
$1.99 · pay once