Free calculator
E-Bike & E-Scooter Charging Time and Cost Calculator
Enter your battery and charger details plus your electricity price to estimate charging time and cost.
Printed on the charger, e.g. 2A or 4A
For cost per 100 km. See the range calculator.
Estimated results — estimates only, real-world results vary.
Charging time
7 h 0 min
20% → 100% with a 96 W charger
Cost of this charge
$0.190
0.632 kWh from the wall
Cost of a full charge
$0.237
672 Wh battery
Cost per 100 km
$0.424
at 12 Wh/km
How it’s calculated
- Battery energy (Wh) = Volts × Amp-hours
- Charger power (W) = Volts × Charger amps
- Time = (energy up to 80%) ÷ power + (energy above 80%) ÷ (power × 0.5)
- Cost = energy added ÷ charging efficiency ÷ 1000 × price per kWh
Assumptions
- Charging runs at full power up to 80%, then tapers; the last 20% is modelled at half power on average.
- Charging efficiency (wall to battery) defaults to 85% to cover charger and battery losses.
- Charger power is estimated from the battery’s nominal voltage — real chargers vary slightly.
Estimates only. Results are approximations based on the assumptions above. Always check your manufacturer’s specifications and safety guidance.
Why the last 20% is slow
Lithium-ion chargers switch from constant current to constant voltage near full charge, so the current tapers off to protect the cells.
Charging is cheap
Even a large e-bike battery stores less than 1 kWh, so a full charge usually costs less than a coffee — often just a few cents.
Frequently asked questions
Is it bad to charge to 100% every time?
Regularly stopping around 80–90% and avoiding storage at 100% can extend battery life. Charge to 100% when you need the full range.
Can I use a faster charger?
Only one the manufacturer approves for your battery. Higher current generates more heat and can shorten battery life or be unsafe.