Power Calculator

Speed: MPH
Weight: Pounds
Grade: Degrees

Required Power:


  • Speed is the target speed in miles per hour.
  • Weight is total vehicle weight including the rider(s) and cargo.
  • Grade: 0 degrees is flat ground and 90 degrees is a vertical wall. The grade is automatically set to 0 unless another number is entered.

This calculator provides a rough estimate of how much power it will take to go on flat ground or up a grade at a certain speed. It does and can not estimate all variables such as lower than normal motor and drivetrain efficiency, higher than normal rolling resistance, and head or tail winds. This calculators mathematical formula is based on real world road testing of electric scooters and bikes performed by ElectricScooterParts.com.

Electric motors provide a lot of torque under load so for example an electric scooter or bike with a 500 Watt motor and one rider could be geared to go 15 MPH on flat ground and with the same gearing it would be able to go up a 10 degrees grade at 7 MPH.

This calculator is designed for brushed motors. Calculations for brushless motors will be around 10% more efficient than the results that this calculator shows.

Note: This calculator is still under construction and currently being fine tuned.