Brake Horsepower Calculator
Convert wheel horsepower to flywheel (brake) horsepower.
Amortization schedule
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Showing first 12 of months.
Growth over time
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Introduction
Brake Horsepower Calculator — Convert wheel horsepower to flywheel (brake) horsepower. Enter Wheel horsepower, Drivetrain loss (%) to get an instant, accurate result.
Formula
Brake horsepower (flywheel/crank estimate) = wheel horsepower / (1 − drivetrain loss % / 100).
Step-by-step
- Enter the Wheel horsepower.
- Enter the Drivetrain loss (%).
- Click Calculate to see your result instantly.
Real-world example
Example: With Wheel horsepower = 350, Drivetrain loss (%) = 15, the Brake Horsepower Calculator gives a result of 411.7647.
Frequently Asked Questions
Why is wheel horsepower lower than crank horsepower?
Power is lost to friction and inertia as it travels through the clutch/transmission, driveshaft, and differential before reaching the wheels — typically 10-15% for a manual RWD car, more for AWD.
What drivetrain loss percentage should I use?
A common estimate is 15% for RWD, 10% for FWD, and 15-20%+ for AWD, though it varies by specific drivetrain design.
What inputs does the Brake Horsepower Calculator need?
You'll need to provide: Wheel horsepower, Drivetrain loss (%). All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.
How accurate is the Brake Horsepower Calculator?
The Brake Horsepower Calculator applies the formula exactly as calculated — Brake horsepower (flywheel/crank estimate) = wheel horsepower / (1 − drivetrain loss % / 100). — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.
Is the Brake Horsepower Calculator free to use?
Yes, the Brake Horsepower Calculator is completely free, requires no signup, and runs instantly in your browser.
About the Brake Horsepower Calculator
The Brake Horsepower Calculator uses a real, verifiable formula — Brake horsepower (flywheel/crank estimate) = wheel horsepower / (1 − drivetrain loss % / 100). — so results are accurate every time, not an approximation.