Wheel Horsepower Estimator
Estimate wheel horsepower from crank horsepower and drivetrain loss.
Wheel Horsepower Estimator measurements
Enter your values, then calculate.
Result
How to calculate wheel horsepower estimator
Translate an engine horsepower rating into an approximate amount delivered at the tires.
How the calculation works
Drivetrain components consume part of the engine output. Subtracting the chosen loss percentage from crank horsepower estimates wheel horsepower.
Example
An engine rated at 400 hp with a 15% drivetrain loss is estimated to deliver 340 hp at the wheels.
Frequently asked questions
What drivetrain loss should I enter?
A rough range is often 10–15% for many two-wheel-drive cars and 15–25% for some all-wheel-drive systems, but actual losses vary.
Wheel Horsepower Estimator
Drivetrain components consume part of the engine output. Subtracting the chosen loss percentage from crank horsepower estimates wheel horsepower.
Let's understand your wheel horsepower estimator result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Wheel Horsepower Estimator
- Use a loss estimate appropriate to the drivetrain and transmission.
- Treat this as a planning estimate; a chassis dynamometer measures actual output.
Common Wheel Horsepower Estimator Mistakes to Avoid
- Adding the loss percentage to wheel horsepower is not the same calculation as subtracting it from crank horsepower.
When to Use This Calculator
Translate an engine horsepower rating into an approximate amount delivered at the tires.