How Many Kilometers Per Charge? Real-World E-Bike Range Explained
Manufacturers promise "up to 100 km", but in practice range depends on weight, terrain, temperature and the assist level you choose. We show you the real calculation formula, how much each factor actually costs you in kilometers, and what you can do to go further on the same battery.
Contents
The basic formula: Wh divided by consumption
The range of an e-bike isn't a fixed number — it's the result of a simple division between available energy and energy spent per kilometer:
Example: an 840Wh battery at 14 Wh/km consumption → roughly 60 km
Capacity in Wh is easy to calculate: Volts × Amp-hours. A 48V 17.5Ah battery has 840Wh (48 × 17.5). See our guide to choosing battery capacity to understand how to pick the right Ah for your kit. If you're still comparing conversion kits generally before picking a battery, our beginner's guide to the e-bike conversion kit market is a useful starting point.
What actually changes real consumption (Wh/km)
The 10-15 Wh/km figure is a reference point for average conditions, but it can vary significantly:
| Factor | Effect on consumption |
|---|---|
| Assist level (eco vs turbo) | Turbo uses 2-3x more than eco |
| Total weight (rider + cargo) | +10 kg ≈ +8-12% consumption |
| Terrain grade | Sustained climb ≈ -30-50% range |
| Tire pressure | Low pressure ≈ +10-15% consumption |
| Headwind | Strong headwind ≈ +15-25% consumption |
| Low temperature | Below 5°C ≈ -10-20% effective capacity |
For how cold weather affects the battery long-term (not just range on a single ride), see our winter e-bike maintenance guide.
Real range by assist level, side by side
Because assist level is the single biggest factor a rider directly controls, it's worth seeing what it looks like in concrete kilometers rather than just a percentage. Using an 840Wh battery as the reference:
| Assist level | Typical consumption | Estimated range (840Wh) |
|---|---|---|
| Eco | 6-9 Wh/km | 93-140 km |
| Tour / Normal | 10-13 Wh/km | 65-84 km |
| Sport | 14-18 Wh/km | 47-60 km |
| Turbo / Max | 19-25 Wh/km | 34-44 km |
The gap between eco and turbo on the same battery can be more than double the range — which is why assist level, not battery size alone, is often the biggest lever a rider has over how far they get on a single charge. Most riders find that using tour or normal mode for flat sections and reserving sport/turbo for hills or headwinds gives the best balance of range and comfort.
Does a higher-power conversion kit reduce range?
Not directly — a 1000W kit doesn't inherently use more energy per km than a 250W kit at the same assist level and speed, because Wh/km is mostly a function of speed, weight and terrain rather than the motor's maximum rated power. What changes is temptation and capability: a more powerful kit makes it easier to ride faster and accelerate harder, and both of those genuinely increase consumption. A rider who uses a 1000W kit at the same speeds and assist habits as they would a 250W kit will see broadly similar Wh/km. A rider who uses the extra power to go faster everywhere will see higher consumption — not because of the kit's power rating, but because of the extra speed and acceleration that power makes possible. For guidance on matching kit power to your actual needs rather than over-buying, see our conversion kit power guide.
Rider weight and cargo: a closer look
Weight's effect on range is often underestimated because it doesn't feel like it should matter as much as it does on a motor-assisted bike. In practice, added weight increases both rolling resistance and the energy needed to accelerate from every stop:
| Added weight | Approx. effect on consumption | Approx. effect on an 840Wh battery's range |
|---|---|---|
| +10 kg (rider or light cargo) | +8-12% | -6 to -9 km |
| +20 kg (panniers, groceries) | +15-20% | -10 to -13 km |
| +30 kg (child seat + cargo) | +22-28% | -14 to -18 km |
The effect is worse in stop-and-go city riding, where the extra weight is felt every time you accelerate away from a junction, than on a steady rural ride at constant speed. If you regularly carry heavy cargo, it's worth checking our cargo capacity guide alongside your range planning, since a kit loaded near its weight limit will show consumption at the higher end of these ranges.
Real examples by battery capacity
Here's what estimated range looks like for the batteries available at All4eBikes, at an average 12-15 Wh/km consumption:
| Battery | Capacity | Estimated range |
|---|---|---|
| 36V 15Ah Downtube | 540Wh | 36-54 km |
| 48V 17.5Ah Downtube | 840Wh | 56-84 km |
| 48V 22.5Ah Downtube | 1,080Wh | 72-108 km |
| 72V 20Ah Triangle | 1,440Wh | 96-144 km |
See all batteries and current prices →
Charging one of these packs is inexpensive regardless of size — see our e-bike charging cost guide for exact figures per charge and per kilometer, so you can weigh range against running cost when choosing a capacity.
Tire type and rolling resistance
Tire choice affects range in a way that's easy to overlook because it isn't as dramatic as terrain or assist level, but it adds up over a full charge. A smooth, high-pressure road/hybrid tire rolls with noticeably less resistance than a knobby off-road tread, simply because less rubber is deforming and gripping the surface at any moment.
| Tire type | Relative rolling resistance | Typical range impact |
|---|---|---|
| Slick / semi-slick road tire | Lowest | Baseline |
| Hybrid tread (light knobs) | Moderate | -5 to -8% |
| Aggressive MTB knobby tread | High | -10 to -15% |
| Fat bike tire (wide, low pressure) | Highest | -20% or more |
None of this means you should always choose the slickest tire — grip and puncture resistance matter for safety and comfort, and an aggressive tread is the right choice off-road regardless of the range cost. It's simply a factor worth knowing about when your real-world range doesn't quite match the manufacturer's figure, which is very likely measured with a low-resistance tire in the first place.
City stop-start riding vs steady rural riding
Two riders covering the same distance at the same average assist level can still see meaningfully different consumption depending on how continuous their riding is. Accelerating from a stop uses disproportionately more energy than maintaining speed, because the motor has to overcome inertia rather than just rolling resistance and drag.
- Steady rural or suburban riding: fewer stops, more consistent speed — typically lands at the lower end of the Wh/km range for a given assist level
- Dense city commuting with frequent junctions: repeated acceleration from a stop can push consumption 10-20% above the steady-riding figure at the same assist level
If your commute is mostly stop-and-go, it's worth planning battery capacity toward the higher end of the estimated range tables above rather than the optimistic end, and it's one more reason eco or tour mode in town, reserved for sport/turbo only where you actually need the extra push, tends to close the gap between expected and real-world range.
Off-road and fat bike range: a different baseline
Everything above assumes reasonably firm terrain — pavement, packed gravel, dry trail. Loose or soft terrain changes the baseline considerably: sand, mud and deep snow can push consumption to 20-35 Wh/km even at moderate assist, simply because the tyre is doing far more work against the surface. If you're riding a fat bike conversion, budget range around your worst likely terrain rather than the flat-road figures in the table above — our fat bike conversion kit guide covers this in more detail, including battery sizing for soft-terrain use.
Cadence sensor vs torque sensor: does it change real efficiency?
The type of pedal-assist sensor fitted to your kit also has a modest but real effect on how efficiently the motor's assist is delivered. A cadence sensor applies a preset level of assist whenever the pedals turn, regardless of how hard you're actually pushing, which can mean the motor contributes more than necessary on easy sections. A torque sensor measures your actual pedaling force and scales assist proportionally, generally delivering power more precisely matched to what's needed. In practice this translates to a modest efficiency gain for torque-sensor setups, more noticeable for riders who vary their pedaling effort a lot rather than riding at a constant cadence. See our cadence vs torque sensor comparison for the full breakdown of ride feel, cost and efficiency differences.
How to increase real range without changing the battery
5 simple ways to gain 10-20% range
- Use the lowest assist level you're comfortable with, not permanent turbo
- Keep tire pressure correct — soft tires cost you efficiency
- Pedal actively, don't rely solely on the motor and throttle
- Remove unnecessary weight from racks or backpacks
- Check your controller settings — too much amperage for your needs increases consumption with no real benefit
None of these require spending money, and combined they can realistically close much of the gap between "manufacturer's best-case number" and what you actually see day to day. Battery health also plays a role over time: a battery that has degraded to 70-80% of its original capacity delivers proportionally less range even with perfect riding habits, which is one more reason to follow good charging practice — see our battery lifespan and maintenance guide for the details.
Tell us your daily distance and terrain type — we'll recommend the right battery capacity for your kit, free of charge.
Get a free recommendation →Frequently asked questions about e-bike range
How do I calculate e-bike range from battery capacity?
General formula: range (km) = battery capacity (Wh) divided by consumption (Wh/km). An e-bike at moderate assist typically uses 10-15 Wh/km, so a 720Wh battery would theoretically deliver 48-72 km. Real consumption varies with weight, terrain and assist level.
What factors reduce real-world range the most?
The biggest factors are: assist level (turbo uses 2-3x more than eco), total weight (rider + cargo), terrain grade, headwind speed, and tire pressure. A sustained climb can cut range by 30-50% compared to flat terrain.
How much power does an e-bike conversion kit use per km on average?
Under normal conditions (flat terrain, moderate assist, average rider weight), a conversion kit uses roughly 10-15 Wh/km. At maximum assist or on climbs, consumption can rise to 20-25 Wh/km or more.
Does a bigger battery always mean more range?
Generally yes, but not linearly - a bigger battery is also heavier, which slightly increases consumption. Still, the net range gain remains significant: a 960Wh battery delivers nearly double the range of a 480Wh one under the same conditions.
How can I increase real-world range without changing the battery?
Use the lowest assist level you're comfortable with, keep tires properly inflated, avoid unnecessary weight, and pedal actively instead of relying solely on the motor - each of these can add 10-20% real-world range.
Does a higher-wattage conversion kit reduce range compared to a lower-wattage one?
Not directly. Consumption (Wh/km) depends mostly on speed, weight and terrain rather than the motor's maximum rated power. A more powerful kit only uses more energy if it's actually used to go faster or accelerate harder - at matched speeds, a 1000W and a 250W kit consume similarly.
Does riding off-road or on a fat bike change range significantly?
Yes, considerably. Loose terrain like sand, mud or deep snow can push consumption to 20-35 Wh/km, roughly double the flat-pavement figure, because the tyre has to work much harder against the surface. Budget battery capacity around your worst realistic terrain, not flat-road numbers.
Does a torque sensor give better range than a cadence sensor?
Generally a small amount, yes. A torque sensor scales assist to your actual pedaling effort, while a cadence sensor applies a preset assist level whenever the pedals turn, which can deliver more power than strictly needed on easy sections. The efficiency gap is modest but real, especially for riders with variable pedaling effort.
Conclusion: real-world range is a calculation, not a promise
The "up to X km" figures on the box are measured in ideal conditions — flat terrain, minimal assist, a light rider. In practice, use the Wh ÷ Wh-per-km formula and the 10-15 Wh/km reference point to realistically estimate what range you'll get for your specific use case, and adjust further for weight, terrain, temperature and assist level using the tables above.
If you're choosing a kit or a DUOTTS electric bike and want to know exactly which battery covers your needs, contact the All4eBikes team for a free recommendation.
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