Engine Motor Horsepower Estimate From Elapsed Time Calculator

Drag Race - Quarter Mile Run

Car Truck Automobile Motorcycle

Trap Speed to HP Elapsed Time to HP Tire Size Calculator Paycheck Calculator


Do you have a high performance car, motorcycle, truck or vehicle, built a new engine, performed a tune up or installed a performance part? Try out this calculator get a rough estimate of horsepower.

This calculator computes the estimated engine or motor horsepower from elapsed time. Elapsed time is the duration a vehicle takes to complete a run in a competition. This rich Internet app uses the quarter mile distance or 400 meter track.

Note: This is a rough and quick estimate of engine horsepower. There are many factors which affect horsepower. Some examples are weather, temperature, humidity, elevation and fuel type. To get more accurate measurement of power rating, the engine should be placed under load using a dynamometer or dyno. This will give a true measurement of peak torque and horsepower.

Note: The ET equation or formula for the calculation uses standard or US units. When using SI units, the units are converted to standard units before the solution is computed.

Note: This web application uses HTML5. It should work on all devices (smart phone, tablet, desktop, laptop, hybrids) and operating systems. If any bugs, errors or issues are found, email the author using the address below.

Calculation Instructions:

  1. Enter vehicle weight - This can be done by entering value or using the up and down arrows to step the number field.
  2. Enter elapsed time - This is the time duration it takes the vehicle to complete a 1/4 mile run.
  3. Analyze/inspect calculations and results in solution, charts and graphs.


Unit Unit Type Unit Used Description
vehicle weight mass pound US (lb) or kilogram (kg) The weight of the car, truck or automobile including the driver, passenger and accessories.
elapsed time time seconds (s) The duration it takes the car to complete of a quarter mile run.


Unit Unit Type Unit Used Description
horsepower power horsepower (hp) The horsepower the electric, diesel or gasoline engine is capable of producing.
Chart or Graph Not applicable Not applicable Shows an Engine Horsepower versus Time plot.

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