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Horsepower Calculator

Write down your vehicle weight and time and the calculator will determine the horsepower it is producing by employing various physical horsepower formulas.

Calculation Method

Vehicle weight

lbs ▾

Time

sec ▾

Related

This horsepower calculator estimates the power output of a vehicle using different calculation methods. It works on standard horsepower formulas and converts between various units.

What Is Horsepower?

Horsepower is a unit of power that measures the rate at which work is done. It is commonly used to describe engine output in vehicles. Two common types are:

Mechanical (imperial) horsepower: 1 HP = 745.7 watts
Metric horsepower (PS)

How to Calculate Horsepower?

Horsepower can be calculated using several methods—manually using formulas or via a calculator.

Elapsed Time (ET) Technique

This method uses the vehicle's weight and the elapsed time to cover a quarter-mile (402.3 meters):

HP = Weight × (Speed ÷ 234)³
Example: Weight = 50, Speed = 7 → HP ≈ 47.4 kW

Trap-Speed Technique

This method uses the vehicle weight and the trap speed (speed at the end of a quarter-mile):

HP = Weight × (Speed)³ ÷ 234
Example: Weight = 20, Speed = 30 mph → HP ≈ 0.2 kW

RPM & Torque Technique

This method calculates horsepower from engine RPM and torque:

HP = (RPM × Torque) ÷ 5,252
Example: RPM = 5,600, Torque = 350 ft·lb → HP ≈ 373.19 HP

Different Types of Horsepower

Mechanical horsepower
Metric horsepower
Tax horsepower
Electrical horsepower
Hydraulic horsepower
Boiler horsepower
Drawbar horsepower
RAC horsepower

How to Use the Horsepower Calculator

Elapsed Time (ET) Method

Inputs:

Vehicle weight (kg or lbs)
Elapsed time to cover a quarter-mile (seconds, minutes, hours)
Click Calculate

Outputs:

Mechanical horsepower (HP)
Metric horsepower (PS)
Kilowatts (kW)
Foot-pounds per second (ft·lb/s)

Trap-Speed Method

Inputs:

Vehicle weight (kg or lbs)
Vehicle speed at the end of quarter-mile (mph, km/h, m/s, km/s)
Click Calculate

Outputs:

HP, PS, kW, ft·lb/s

RPM & Torque Method

Inputs:

Select calculation type: Engine Horsepower or Engine Torque
Enter engine RPM
Enter engine torque
Click Calculate

Outputs:

Engine Horsepower → HP, PS, kW, ft·lb/s
Engine Torque → Torque of the engine

Definition Method

Inputs:

Force applied
Distance covered (m, km, or yards)
Time taken to cover distance
Click Calculate

Outputs:

Engine power in watts (W)
Mechanical horsepower (HP)
Metric horsepower (PS)
Kilowatts (kW)
Foot-pounds per second (ft·lb/s)
Electrical horsepower (EHP)
Boiler horsepower (BHP)

References

Wikipedia: Horsepower
Crown Toyota: Horsepower of the 2020 Toyota Tundra

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