軸馬力計算機

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はじめに

Brake Horsepower Calculator — Convert wheel horsepower to flywheel (brake) horsepower. Enter Wheel horsepower, Drivetrain loss (%) to get an instant, accurate result.

計算式

Brake horsepower (flywheel/crank estimate) = wheel horsepower / (1 − drivetrain loss % / 100).

ステップごとの説明

Enter the Wheel horsepower.
Enter the Drivetrain loss (%).
Click Calculate to see your result instantly.

実例

Example: With Wheel horsepower = 350, Drivetrain loss (%) = 15, the Brake Horsepower Calculator gives a result of 411.7647.

よくある質問

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.