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Torque to HP Calculator

Convert between torque and horsepower with RPM calculations for engines and motors

Torque & Horsepower Converter

rpm

Rotations per minute

Horsepower Results

31.599 hp(I)
Mechanical Horsepower

Calculation Details

Power: 23563.2 W
Engine Speed: 1500 rpm
Input Torque: 150 N⋅m
Formula Used: P = T × ω / 9.5488

Common Engine Examples

Small Car Engine

Typical compact car

Torque: 150 N⋅m
Speed: 4000 rpm
Power: ~100 hp

Motorcycle Engine

Sport bike engine

Torque: 85 N⋅m
Speed: 6000 rpm
Power: ~75 hp

Truck Engine

Heavy-duty diesel

Torque: 500 lb⋅ft
Speed: 1800 rpm
Power: ~300 hp

Electric Motor

Electric vehicle motor

Torque: 400 N⋅m
Speed: 3000 rpm
Power: ~200 hp

Small Generator

Portable generator

Torque: 25 N⋅m
Speed: 3600 rpm
Power: ~15 hp

Industrial Motor

Heavy machinery

Torque: 1200 N⋅m
Speed: 1750 rpm
Power: ~350 hp

Conversion Formulas

Power Formula

P = T × ω / 9.5488

P: Power (Watts)

T: Torque (N⋅m)

ω: Angular velocity (rpm)

Imperial Formula

HP = (T × RPM) / 5252
For torque in lb⋅ft and mechanical HP

Horsepower Types

hp(I)
Mechanical Horsepower
745.7 W
hp(M)
Metric Horsepower
735.499 W
hp(E)
Electrical Horsepower
746 W
hp(S)
Boiler Horsepower
9,809.5 W
ahp
Air Horsepower
944 W
whp
Water Horsepower
746.043 W

Quick Reference

Typical RPM Ranges

Idle speed: 600-1000 rpm

Car engines: 1500-6000 rpm

Diesel engines: 1000-4000 rpm

Electric motors: 1000-10000 rpm

Power Relationships

1 hp = 745.7 W

1 kW = 1.34 hp

Torque ∝ 1/RPM (constant power)

Understanding Torque vs. Horsepower

What is Torque?

Torque is the rotational equivalent of force. It measures the ability to rotate an object around an axis. Torque is what gets things moving from rest and determines acceleration.

What is Horsepower?

Horsepower measures the rate at which work is done - essentially how quickly energy is transferred. It's torque multiplied by rotational speed, representing total power output.

The Relationship

Horsepower = Torque × RPM ÷ 5252

(For torque in lb⋅ft and mechanical horsepower)

Practical Applications

  • •High Torque: Better for towing, acceleration, off-road driving
  • •High Horsepower: Better for top speed, sustained high-speed performance
  • •Diesel Engines: High torque at low RPM
  • •Gas Engines: Higher RPM capability for horsepower

Key Differences

Torque: Measures twisting force (N⋅m, lb⋅ft)
Horsepower: Measures power output rate (hp, kW)
Speed Relationship: At constant power, torque decreases as RPM increases

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