The Terrain Resistance Calculator estimates how much rolling resistance and uphill gradient force your eBike must overcome on roads, trails, dirt or steep climbs. Weight, slope, tire type and air drag all combine to determine the total power your motor needs to maintain speed on different terrain.
Every surface adds a different rolling coefficient. Smooth pavement wastes less energy, while gravel or mud absorbs significantly more power. When elevation increases, gravitational force becomes a major component, requiring higher motor torque and more current draw from the battery.
When riding uphill, your eBike must lift both you and the bike against gravity. Even a mild 5% slope dramatically increases required watts. Weight and slope angle multiply each other, making elevation changes the single largest factor in hill power consumption.
Smooth asphalt has a low rolling resistance, while off-road surfaces like gravel, sand and grass can triple the friction coefficient. Wider soft tires further increase drag, especially at lower pressure. This calculator helps visualize how much extra power various surfaces require.