Drivetrain loss sensitivity table
Compare wheel-power scenarios across selected loss assumptions. Change an input to explore the relationship.
Input parameters
Set your values below. The table updates automatically.
Drivetrain loss sensitivity results
Percentages are scenarios, not claimed losses for particular drivetrain types.
| Assumed loss (%) | Engine hp | Estimated wheel hp | Estimated wheel kW |
|---|---|---|---|
| 0.00 | 400 | 400 | 298.28 |
| 5.00 | 400 | 380 | 283.37 |
| 10.00 | 400 | 360 | 268.45 |
| 15.00 | 400 | 340 | 253.54 |
| 20.00 | 400 | 320 | 238.62 |
| 25.00 | 400 | 300 | 223.71 |
| 30.00 | 400 | 280 | 208.8 |
How this table is calculated
wheel power = engine power × (1 − loss/100)Rows use the same assumptions while varying the value in the first column. Input-unit controls change the units used to enter values; column headers always state the output units.
How to read this comparison
Engine power remains fixed while the assumed loss percentage changes. Read across a row to compare the resulting wheel-power scenario in mechanical horsepower and kilowatts.
A worked example with the initial inputs
At the initial 400 hp, a selected 15% loss leaves 400 × 0.85 = 340 wheel hp. A 20% assumption leaves 320 hp. The 20 hp difference comes entirely from changing the assumption.
The live table changes when you edit its controls.
Use the interactive calculator to explore more scenarios, units and relevant inputs.
Frequently asked questions
Which row is the correct drivetrain loss for my car?
The table cannot determine that. No row is assigned to a drivetrain type, and a selected percentage does not measure efficiency. Use appropriate engine and wheel measurements for an actual comparison.
Why do input controls and column headers show different units?
The unit toggle changes how you enter dimensional inputs. Each output column keeps its stated unit so you can compare values consistently. Read the column header before copying a result.
Understand the method in more detail
Source and assumptions
Power and rate of work; mechanical horsepower conversion follows 550 ft·lbf/s.
NASA Glenn — What is power?Read the calculation methodology for model scope, unit conventions and review status.