Estimate how far your electric bike will go on one charge. The calculator models rolling resistance, air drag, hills, wind and your assist level from real physics, then shows range in miles and km, energy use per mile and a comparison across all assist modes.
Last updated:
Battery
Battery size given as
Wh
Printed on the pack, e.g. 400, 500, 625, 750 Wh
V
Ah
%
Most packs deliver ~85–95% of the rated Wh; older batteries less
Rider and bike
Route and conditions
Same unit as speed. Use the average wind against you.
Enter your values to see the result.
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How to use the E-Bike Range Calculator
Enter the battery in watt-hours, or as voltage × amp-hours (48 V × 14 Ah = 672 Wh).
Pick your assist level and bike type.
Add total weight and average speed, in your preferred units.
Describe the ride: terrain, wind, stops and temperature.
Press Calculate range to see miles/km per charge, Wh per mile and the comparison table.
How the e-bike range estimate works
The calculator works out how much power is needed to hold your average speed, how much of it the motor supplies at your assist level, and how long the battery can feed that motor:
Rolling resistance: F = m · g · Crr, where Crr (including real road roughness) is about 0.005 for slick road tires, 0.007 for hybrids and up to 0.015 for fat tires.
Air drag: F = ½ · ρ · CdA · (v + headwind)², with air density ρ ≈ 1.2 kg/m³ and a frontal drag area CdA of roughly 0.45 m² (leaning forward) to 0.85 m² (upright cargo bike).
Hills: F = m · g · sin θ on climbs. Descents are assumed to recover nothing (e-bikes rarely regenerate, and you brake), which is why hilly routes cost range even when you return to the start.
Power and battery draw: total force × speed, divided by about 95% drivetrain efficiency and about 75% motor and controller efficiency for the motor's share.
Range: usable Wh ÷ Wh per mile.
Typical e-bike energy use
Riding style
Typical use
500 Wh battery
750 Wh battery
Eco, flat, 12–15 mph
5–8 Wh/mi
55–90 mi
85–135 mi
Tour / normal, mixed roads
7–11 Wh/mi
40–65 mi
60–95 mi
Sport or Turbo, 18–20 mph
10–16 Wh/mi
28–45 mi
42–68 mi
Throttle only, 20 mph
15–25 Wh/mi
18–30 mi
27–45 mi
eMTB on steep trails
15–30 Wh/mi
15–30 mi
22–45 mi
These are rough ranges for a 200–250 lb combined rider and bike weight with about 90% of the battery usable. Your own numbers will vary.
Tips for a realistic number
Use your average speed including slow sections, not your cruising speed.
For a round trip into the wind, enter about half the wind speed: the headwind leg costs more than the tailwind leg gives back.
Battery capacity fades with age; after 500+ full cycles, try 75–85% usable.
Plan long rides around the low end of the realistic span so you are not caught with an empty battery.
Frequently asked questions
How far can an e-bike go on one charge?
Most e-bikes cover 20 to 80 miles (30 to 130 km) per charge. The spread is huge because range depends on battery size, assist level, speed, weight, hills, wind and temperature. A 500 Wh battery ridden at moderate assist on mostly flat roads typically gives 40 to 60 miles.
How do I calculate e-bike range from watt-hours?
Range = usable battery energy ÷ energy used per mile. For example, 450 usable Wh ÷ 15 Wh/mi = 30 miles. Typical consumption is about 5–11 Wh/mi in low to medium assist, 12–25 Wh/mi with high assist or throttle at 20 mph, and more on steep hills.
How do I convert volts and amp-hours to watt-hours?
Multiply them: Wh = V × Ah. A 36 V 10 Ah battery stores 360 Wh, a 48 V 14 Ah battery 672 Wh and a 52 V 17.5 Ah battery 910 Wh. Watt-hours are the best way to compare batteries with different voltages.
Why does speed reduce e-bike range so much?
Air drag grows with the square of speed, so the power needed grows roughly with the cube. Riding at 20 mph instead of 15 mph can cut range by a third or more, even though you only go 33% faster.
Does cold weather reduce e-bike battery range?
Yes. Lithium-ion cells deliver less energy when cold. Near freezing you can lose 15–30% of range; storing and charging the battery indoors and fitting it just before the ride helps.
How accurate is this e-bike range estimate?
It is a physics-based estimate with typical values for drag, tire rolling resistance and motor efficiency (about 75%), so real rides usually land within about ±15%. Gusty wind, many hills, low tire pressure or an aging battery reduce range; drafting, smooth tires and steady riding increase it.
How can I get more range from my e-bike?
Use a lower assist level, keep your speed moderate, pump tires to the recommended pressure, shift to an easy gear when starting, avoid hard acceleration and carry a spare battery or charger for long trips. Lighter loads and a less upright position also help.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.