How Far Can an E-Bike Go on One Charge? Real-World Range Explained

Range is the question every new e-bike rider asks, and the one marketing answers worst. A bike advertised with “up to 100 miles” might give you 35 on a hilly commute in January. Nothing is wrong with the bike. Range depends on how, where and when you ride.

The good news: you can predict your range quite accurately with one simple formula.

The e-bike range formula

Range = usable battery energy (Wh) ÷ energy used per mile (Wh/mile)

Battery capacity is printed on the pack or in the spec sheet in watt-hours (Wh). If you only see volts and amp-hours, multiply them: a 36 V × 14 Ah battery holds 504 Wh. The battery management system keeps a small reserve at the top and bottom of the pack, so about 90% of the rated capacity is usable in practice.

Consumption is the variable part. These are typical figures for a pedal-assist e-bike with an average rider:

So a 500 Wh battery (≈450 Wh usable) gives roughly 45 miles in Eco, 30 miles of mixed commuting, and 18 miles of hard riding.

Typical range per charge

20 to 60 mi 30 to 100 km

Usable share of rated battery capacity

≈90%

Range lost near freezing

15 to 25%

Energy used in Turbo vs Eco

2 to 3×

Real-world range by battery size

Use this table as a planning guide. It assumes 90% usable capacity and the three consumption levels above.

Want a number for your exact bike, weight and route? Our free e-bike range calculator does the maths for you, in miles or kilometers.

What drains an e-bike battery fastest

Not all factors are equal. In rough order of impact:

1. Assist level. The biggest single lever. Turbo or Boost can use two to three times as much energy per mile as Eco.
2. Hills. Lifting rider and bike uphill takes a lot of energy. Long climbs can double consumption, and you only win a little back on the descent.
3. Total weight. Rider, bike, bags and child seats. Each extra 10 kg (22 lb) adds noticeably to consumption on hilly routes.
4. Speed. Aerodynamic drag rises with the square of speed. Riding at 20 mph instead of 15 mph costs far more than a third extra energy.
5. Temperature. Lithium-ion cells deliver less energy when cold, because internal resistance rises (see Battery University’s explanation).
6. Stop-start riding. Every acceleration from a standstill costs energy. Bosch notes that frequent starting and stopping is less economical than steady riding.
7. Tires and pressure. Knobby or under-inflated tires roll slowly. Fat tires and off-road treads cost the most.
8. Wind. A steady headwind behaves like a never-ending hill.
9. Battery age. A pack at 80% state of health gives 80% of the range it did when new.

Why manufacturer range claims are so optimistic

Range claims are usually measured under gentle conditions. Bosch’s R200 test, for example, assumes a steady 20 km/h (12.4 mph), a cadence of 60 rpm and controlled conditions. That makes it useful for comparing batteries, but it doesn’t describe your Monday commute.

As a rule, plan around 60 to 70% of the advertised maximum for everyday riding. Use the full figure only for flat, warm, Eco-mode riding.

Cold-weather range: what to expect

Near 0 °C (32 °F), expect roughly 15 to 25% less range. Below freezing, the loss can be greater. The energy isn’t gone: warm the battery back up and it returns. To minimize the effect:

• Store and charge the battery indoors at room temperature.
• Fit it to the bike just before you leave.
• Consider a neoprene battery cover for long winter rides.
• Never charge a battery that is below freezing. Let it warm up first.

Nine ways to get more range from your e-bike

How much range do you actually need?

Take your longest regular ride, multiply it by 15 Wh per mile (about 9 Wh per km), then add a 25% buffer for cold days, detours and battery aging. For example, a 12-mile round trip suggests about 225 Wh, so almost any modern e-bike will do. A 40-mile weekend loop in the hills, on the other hand, points to 750 Wh or a range extender.