14 calculators · electric scooters & EVs
EV maths,
worked out.
Real range instead of marketing range. Charge times that include the taper. Pack designs, wire gauges and running costs. Free tools that show their formulas — because a number you cannot check is just a rumour.
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Plan on 33.4 km with a 20% reserve, or 16.7 km each way.
- Consumption
- 11.9Wh/km
- Usable energy
- 496Wh
- Ride time
- 2 h 5min
- Pack size
- 551Wh
Four kinds of question
Everything on this site answers one of them: how far it goes, what the battery is doing, what it costs, or how to build it without setting fire to anything.
4 tools
Battery & Charging Capacity, charge time, state of health and honest degradation maths.4 tools
Cost & Emissions What a charge costs, what a car costs, and the carbon you skip.3 tools
Build & Wiring Pack layout, motor winding, conductor sizing — for people with a soldering iron.3 tools
Start here
The six people reach for most, from buying decisions to build maths.
Scooter Range Calculator
Real range from your battery size, weight, speed, hills and temperature — not the number on the box.
Charge Time Calculator
Charge time from capacity, charger amps and state of charge — including the slow CV taper at the top.
Watt-Hours Calculator
Convert between Wh, kWh, Ah and mAh — and check whether your battery can legally fly.
Charging Cost
Cost per charge, per 100 km and per year — with charging losses included, unlike most calculators.
Power to Top Speed
Solve for the speed where your motor power runs out against drag, weight and gradient.
Battery Pack Builder
S and P counts to voltage, capacity, current limit, weight and cost — with real 18650 and 21700 cells.
How the tools work
No accounts, no uploads, no waiting. Type, read, ride.
Enter what you know
Battery voltage, amp-hours, your weight, the hill outside your door. Presets for popular scooters fill it in if you would rather not look anything up.
Watch the gauge move
Results update as you type — no submit button. Every tool shows the secondary numbers that explain the headline one, so you can see which input is hurting you.
Check the working
The formula and the constants sit right under each calculator. Disagree with a coefficient? Change the input and watch the result follow.
Method
Physics, not vibes
The performance tools use standard vehicle dynamics — rolling resistance, aerodynamic drag and gradient — with coefficients calibrated against measured scooter consumption, not scaled down from bicycle data. The battery tools follow published lithium-ion charging behaviour, including the constant-voltage taper everyone else ignores.
Where a number is uncertain, the tool says so. Where a manufacturer claim is optimistic, the tool says that too.
- Nothing leaves your device
- Formulas published on every page
- Calibrated against real consumption data
- No ads, no signup, no upsell
Longer reads
The background a calculator cannot fit into a readout.
How far can an electric scooter really go?
Advertised range is a laboratory figure. Here is the arithmetic that predicts your actual distance, and the five things that quietly halve it.
The charging rules that actually extend battery life
Most of what shortens a lithium pack is avoidable and free. Nine evidence-based habits, ranked by how much difference they make.
18650 vs 21700: choosing cells for a scooter pack
Two cylindrical formats dominate light EV packs. The difference is not just size — it changes current capability, weight, cost and how you build.
EV charging levels explained: L1, L2 and DC fast
Three tiers, two current types, and one number that decides your home charging speed — the onboard charger you probably have not checked.
Before you ask
Are these calculators free?
Yes — all fourteen, with no account, no email and no usage limit. They run entirely in your browser, so nothing you type is sent to a server.
How accurate are the results?
The range, speed and hill tools are built on standard vehicle dynamics — rolling resistance, aerodynamic drag and gradient — calibrated against measured scooter consumption. For steady riding on known terrain they typically land within 10–15% of reality. Treat every result as a planning figure, not a guarantee.
Do they work for e-bikes and electric cars too?
Mostly, yes. The battery, charging, cost and wiring tools are chemistry and electrical maths that apply to any EV. For the range and speed tools, change the drag area to suit a seated cyclist or a car and the physics carries over unchanged.
Why should I trust the numbers?
Because every tool shows its formula on the page, along with the constants it assumes. You can check the arithmetic yourself, or substitute your own coefficients if you have measured them.
Do you store the values I enter?
Only in your own browser, so a tool remembers your setup the next time you visit. Nothing is transmitted, there is no analytics-driven profiling of your inputs, and clearing site data removes it.
Which calculator should I start with?
If you are buying a scooter, start with the range calculator and the watt-hours calculator. If you already own one, the charge time and battery health tools tell you the most about what you have. If you are building a pack, start with the pack calculator and the wire gauge calculator.
Pick a number
Fourteen calculators. None of them will flatter your scooter.
Range, charge time, watt-hours, pack layout, wire gauge, running cost and emissions — free and instant.