Calculate realistic electric bike range in miles and kilometers based on battery capacity (Wh, V, Ah), assist mode, speed, rider & cargo weight, terrain slope, wind, ambient temperature, and tire rolling resistance.
Specify battery capacity, motor assist level, and cruising speed.
78.0 kilometers • 3.2 hours runtime
| Assist Level | Range | Drain | Motor W |
|---|---|---|---|
| Eco (+50%) | 68 mi | 7.4 Wh/mi | 110 W |
| Tour (+100%) | 48 mi | 10.3 Wh/mi | 155 W |
| Sport / eMTB (+200%) | 33 mi | 15.1 Wh/mi | 226 W |
| Turbo (+300%) | 24 mi | 20.5 Wh/mi | 308 W |
| Throttle Only (0% Human) | 19 mi | 26.3 Wh/mi | 395 W |
Electric bikes consume under 1 kWh per 50 miles, emitting 20× less CO₂ per mile than standard passenger cars.
Almost every electric bicycle manufacturer markets their bikes with bold claims such as "Up to 60–80 Miles on a Single Charge!" Yet, when new owners take their e-bikes out into the real world, they often find the battery drained after just 22 to 30 miles.
This gap occurs because factory range tests are conducted under artificially optimal conditions: a 135 lb (60 kg) test rider pedaling at a gentle 11 mph (18 km/h) in the lowest Eco mode on glass-smooth pavement in 75°F (24°C) weather with zero wind. In contrast, real-world commuting involves aerodynamic drag scaling with the cube of speed (\(v^3\)), stop-and-go intersections, cold morning temperatures, hill climbs, and higher assist modes.
Our E-Bike Range Calculator computes exact real-world distance by balancing the fundamental resistive forces acting on the rider against usable stored electrochemical energy:
\[P_{\text{aero}} = \frac{1}{2} \rho C_d A (v + v_{\text{wind}})^2 v\] Air resistance accounts for over 70% of total motor power demand above 15 mph (24 km/h).
\[P_{\text{roll}} = C_{rr} m_{\text{total}} g v\] Governed by tire casing suppleness, width, and air pressure across total rider, bike, and cargo mass.
\[P_{\text{climb}} = m_{\text{total}} g v \sin(\theta)\] Climbing grades requires massive mechanical potential energy, spiking motor current draw.
The table below outlines common OEM battery configurations, nominal voltages, Amp-hour ratings, and realistic real-world range estimates across typical riding profiles:
| Battery Pack / Brand | Voltage & Ah | Capacity (Wh) | Eco Mode Range | Tour Mode Range | Turbo Mode Range |
|---|---|---|---|---|---|
| Specialized SL 1.1 / Mahle X35 | 36V • 8.9Ah | 320 Wh | 40–48 mi (65–77 km) | 28–34 mi (45–55 km) | 15–19 mi (24–30 km) |
| Bosch PowerPack 400 | 36V • 11.0Ah | 400 Wh | 50–60 mi (80–96 km) | 35–42 mi (56–67 km) | 18–24 mi (29–38 km) |
| Bosch PowerTube 500 / Shimano E8010 | 36V • 13.8Ah | 500 Wh | 62–74 mi (100–119 km) | 44–52 mi (70–84 km) | 22–28 mi (35–45 km) |
| Bosch PowerTube 625 / Shimano BT-E8036 | 36V • 16.7Ah | 625 Wh | 78–92 mi (125–148 km) | 55–65 mi (88–105 km) | 28–35 mi (45–56 km) |
| Rad Power Bikes / Aventon 48V | 48V • 14.0Ah | 672 Wh | 50–65 mi (80–105 km) | 35–45 mi (56–72 km) | 20–26 mi (32–42 km) |
| Bosch Smart System 750 | 36V • 20.1Ah | 750 Wh | 92–110 mi (148–177 km) | 65–78 mi (105–125 km) | 34–42 mi (55–68 km) |
| Juiced / Bafang 52V High-Output | 52V • 19.2Ah | 998 Wh | 75–95 mi (120–153 km) | 50–65 mi (80–105 km) | 28–36 mi (45–58 km) |
Enter your battery's total capacity in Watt-hours (Wh) or select a standard preset (Bosch, Shimano, Rad Power, Aventon). If you only know Voltage and Amp-hours, use the helper solver (\(\text{Wh} = V \times \text{Ah}\)).
Choose your primary assist level (Eco, Tour, Sport, Turbo, or Throttle) and input your desired cruising speed. Remember that riding at 20+ mph drastically accelerates aerodynamic battery drain.
Enter your body weight, bicycle and cargo weight, road slope gradient, headwind speed, and ambient temperature (factoring in lithium-ion cold-weather derating).
Review your estimated range in miles and kilometers, energy consumption rate (Wh/mi or Wh/km), riding duration, charging electricity cost, and the 5-mode comparison matrix.
Running out of battery on a heavy 55 lb (25 kg) e-bike turns a pleasant ride into an exhausting chore. By providing realistic physics-based estimates tailored to your exact terrain, hills, and headwinds, this calculator allows you to plan recharge points and select the optimal assist mode safely.
Many winter commuters are shocked when their battery dies halfway to work. Freezing temperatures (32°F / 0°C) increase internal cell resistance, temporarily reducing usable capacity by 20% to 35%. Our tool factors in ambient temperature so you are never stranded in the cold.
Charging a 500Wh e-bike battery costs only $0.07 to $0.12 in electricity. Our calculator displays exact charging costs per cycle and equivalent MPGe (>1,500 MPGe), proving how e-bikes deliver immense financial savings over combustion vehicles.
Power required to overcome aerodynamic resistance scales with the cube of speed. Increasing cruising speed from 15 mph to 22 mph doubles motor electrical draw.
Contributing 100 Watts of human pedal effort in Eco mode reduces motor load by 50%–70%, more than doubling your total riding distance compared to full throttle.
Lifting mass against gravity is pure mechanical work (\(E = mgh\)). A 5% climb increases energy consumption from 10 Wh/mi to over 28 Wh/mi.
Cold weather thickens battery electrolyte, increasing internal impedance. Storing the battery indoors before riding recovers 10%–15% of lost cold-weather range.
Under-inflated 4.0-inch fat tires generate up to 3× the rolling resistance of supple commuter tires at 50 PSI, draining 15% to 25% more battery per mile.
Accelerating a heavy e-bike from a dead stop pulls peak motor current (up to 750W–1000W). Coasting smoothly to stops conserves substantial battery reserves.
E-bike lithium-ion battery packs cost $400 to $900+ to replace. Follow these proven battery management guidelines to maintain maximum capacity and prevent premature cell degradation:
Leaving a lithium-ion pack at 100% full charge for weeks causes high anode voltage stress and electrolyte oxidation. If not riding for more than a few days, store your battery at 50% to 70% state-of-charge in a cool, dry room (50°F–68°F / 10°C–20°C).
Charging lithium-ion cells below freezing (32°F / 0°C) causes permanent lithium metal plating on the anode, which destroys cell capacity and creates internal short-circuit hazards. Always bring your battery indoors and allow it to reach room temperature before plugging in the charger.
Mid-drive motors operate at highest efficiency (85%+) when pedaling at 75 to 90 RPM. Grinding up steep hills in a high gear at 40 RPM forces the motor into low-RPM thermal inefficiency, wasting battery energy as heat instead of forward propulsion.
Motor placement significantly affects real-world energy efficiency and battery consumption:
Mid-drives drive the chain directly, allowing the motor to utilize the bike's rear cassette gears. On steep 6%–10% climbs, shifting into an easy cog keeps the motor spinning in its optimal efficiency sweet spot (85%+), consuming up to 30% less battery on hilly terrain than hub motors.
Hub motors are located inside the rear or front wheel hub and spin at wheel RPM. While highly reliable, simple, and quiet for flat commuting, hub motors bog down on steep hills, drawing high amperage at low efficiency (60%–70%) and generating excess heat that depletes battery reserves quickly.
Input battery capacity directly in Watt-hours (Wh) or solve automatically from nominal Voltage (\(36\text{V}, 48\text{V}, 52\text{V}\)) and Amp-hours (\(\text{Ah}\)).
Applies electrochemical temperature response curves to model cell internal impedance from warm \(22^\circ\text{C}\) down to sub-zero \(-10^\circ\text{C}\) winter conditions.
Implements fluid dynamic equations with frontal area coefficients (\(C_d A\)) matching upright commuter, drop-bar road, and wide mountain bike postures.
Dynamically outputs side-by-side distance, drain rates (Wh/mi & Wh/km), and motor power across Eco, Tour, Sport/eMTB, Turbo, and Throttle modes.
Accounts for rolling resistance coefficients (\(C_{rr}\)) across high-pressure road slicks, city commuter puncture-layers, knobby trail treads, and 4.0-inch fat tires.
Calculates cost per full charge (\(\$0.07\text{–}\$0.14\)) and gasoline-equivalent fuel economy exceeding \(1,500\text{ MPGe}\).
Bosch drive systems are among the world's most widely equipped e-bike powertrains. Understanding how different Bosch drive units and PowerTube capacities perform helps you optimize range:
| Bosch Drive Unit | Max Torque | Max Support | PowerTube 500 Range | PowerTube 750 Range | Primary Discipline |
|---|---|---|---|---|---|
| Active Line / Plus | 40–50 Nm | 250%–270% | 55–70 mi (88–112 km) | 80–105 mi (128–168 km) | City Commuting & Touring |
| Performance Line (Gen 3/4) | 65–75 Nm | 300% | 45–58 mi (72–93 km) | 68–88 mi (109–141 km) | Trekking & Fast Commute |
| Performance Line CX (Smart System) | 85 Nm | 340% | 35–48 mi (56–77 km) | 55–72 mi (88–115 km) | e-MTB Alpine Trail Riding |
| Cargo Line (Gen 4) | 85 Nm | 400% | 25–35 mi (40–56 km) | 38–52 mi (61–83 km) | Heavy Cargo & Family Hauling |
Mid-drive motors achieve peak electrical efficiency (85%+) at 75–85 RPM. Grinding up hills in heavy gears at 40 RPM causes high current draw and thermal loss, cutting battery life by up to 25%.
Aerodynamic drag scales with the cube of speed. Dropping cruising speed from 22 mph to 16 mph reduces aerodynamic power demand by more than 50%, adding 10 to 18 miles of range on a 500Wh pack.
Under-inflated tires increase rolling resistance by 30% to 50%. Check tire pressure weekly and inflate to manufacturer specifications to save 3 to 6 Wh per mile.
Accelerating from a standstill pulls peak current (up to 750W–1000W). Start off in an easy mechanical gear with human pedal force and coast gently toward stops instead of braking hard.
When planning long backcountry rides or hilly commutes, use these proven energy consumption rules of thumb:
Comprehensive answers to common questions about e-bike range, battery capacity, energy consumption, and charging.
