Drivetrain Loss Calculator

Disclaimer: While we strive to ensure the accuracy of our calculator tools, we cannot be held responsible for any damages or financial losses resulting from their use.

Are you looking to determine how much power is lost between your engine and wheels? Our Drivetrain Loss Calculator helps you estimate the percentage of power lost due to drivetrain inefficiencies. Whether you have an FWD, RWD, or AWD vehicle, this tool provides quick and accurate results.

Enter your engine horsepower (HP) and wheel horsepower (WHP) to see the drivetrain loss percentage and an estimate of your drivetrain type.

What Is Drivetrain Loss?

Drivetrain loss refers to the power that is lost between the engine and the wheels as the power is transmitted through the various components of the drivetrain.

These components typically include the transmission, driveshaft, differential, axles, and other mechanical parts. The loss occurs due to factors such as friction, heat, and mechanical inefficiencies in these components.

Key Points About Drivetrain Loss:

1. Measurement: It is usually expressed as a percentage of the engine’s total power output. For example, if an engine produces 300 horsepower (Engine HP) but only 270 horsepower reaches the wheels (Wheel Horsepower, or WHP), the drivetrain loss is 10%.
2. Typical Values:
   • Rear-wheel-drive (RWD) vehicles: ~15% loss.
   • Front-wheel-drive (FWD) vehicles: ~10% loss.
   • All-wheel-drive (AWD) vehicles: ~20% or 25%% loss.
3. Factors Affecting Drivetrain Loss:
   • Type of drivetrain (RWD, FWD, AWD).
   • Mechanical condition of components (e.g., worn-out bearings increase loss).
   • Lubrication quality.
   • Temperature and operating conditions.

Formula to Calculate Drivetrain Loss (%):

Drivetrain Loss % = (Engine HP−WHP/Engine HP​) × 100

Where:

• Engine HP = Horsepower at the crank (before drivetrain loss)
• WHP = Horsepower at the wheels (after drivetrain loss)

Example 1: RWD Car (Rear-Wheel Drive)

• Engine HP = 400 HP
• WHP = 340 HP

Drivetrain Loss Calculation:

(400−340/400) × 100 = (60/400) × 100 = 15%

Result: 15% drivetrain loss (RWD typically has ~15% loss)

Example 2: FWD Car (Front-Wheel Drive)

• Engine HP = 300 HP
• WHP = 270 HP

Drivetrain Loss Calculation:

(300−270/300) × 100 = (30/300) × 100 = 10%

Result: 10% drivetrain loss (FWD typically has ~10% loss)

Example 3: AWD Car (All-Wheel Drive)

• Engine HP = 500 HP
• WHP = 400 HP

Drivetrain Loss Calculation:

(500−400/500) × 100 = (100/500) × 100 = 20%

Result: 20% drivetrain loss (AWD typically has ~20% loss)

Related Calculators:

Wheel torque calculator

Whp to hp calculator

Torque to hp calculator