Free · Everyday planning calculators
Wheel Power from Drivetrain Efficiencies
Combine user-supplied component efficiencies for front or rear wheel drive.
- Formula & worked example
- Private in your browser
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Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
Eight 90% factors retain 43.046721% of input power, giving 86.093442 hp from 200 hp.
Wheel power = engine power × product of stage efficiencies
Worked example
Enter these known values and leave the other values blank.
- Drive type
- Rear wheel drive (RWD)
- Engine horsepower
- 200 hp(l)
- Bearing efficiency
- .9
- Number of bearings
- 1
- Gear mesh efficiency
- .9
- Number of gear meshes
- 1
- Bearing efficiency
- .9
- Number of bearings
- 1
- Universal joint efficiency
- .9
- Number of universal joints
- 1
- Bearing efficiency
- .9
- Number of bearings
- 1
- Gear mesh efficiency
- .9
- Number of gear meshes
- 1
- Rzeppa joint efficiency
- .9
- Tripod joint efficiency
- .9
- Gearbox efficiency
- 0.81
- Propeller shaft efficiency
- 0.81
- Differential efficiency
- 0.81
- Driveshaft efficiency
- 0.81
- Rear wheel drivetrain efficiency
- 0.4305
- Wheel horsepower
- 86.1 hp(l)
Assumptions and limitations
- Losses multiply, rather than adding as percentages. The supplied efficiencies and component counts are planning inputs, not measured drivetrain losses. A chassis dynamometer or actual measured efficiency is needed for a vehicle-specific result.
Common questions
What does this estimate assume?
Losses multiply, rather than adding as percentages. The supplied efficiencies and component counts are planning inputs, not measured drivetrain losses. A chassis dynamometer or actual measured efficiency is needed for a vehicle-specific result.
Can I find a missing input?
Clear the unknown field and enter compatible known values. The controls retain supported inverse calculations, while rounded counts and one-way outputs stay directional.
References
The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.
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