Torqueto Hp Converter
Our free force pressure & torque converter handles torqueto hp conversions. See tables, ratios, and examples for quick reference.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Torqueto Hp Converter
Calculator
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Formula: HP = (Torque x RPM) / 5252
Worked example โ 400 lb-ft at 4000 RPM = 304.65 HP (227.14 kW)
Formula
HP = (Torque x RPM) / 5252
Horsepower equals torque (in lb-ft) multiplied by RPM, divided by 5252. The constant 5252 is derived from 33,000 ft-lb/min (the definition of 1 HP) divided by 2 times pi. This formula links the static rotational force (torque) with the rate of rotation (RPM) to produce a measure of power output.
Worked Examples
Example 1: V8 Engine at Peak Torque
Problem:A V8 engine produces 400 lb-ft of torque at 4000 RPM. What is the horsepower?
Solution:HP = (Torque x RPM) / 5252 HP = (400 x 4000) / 5252 HP = 1,600,000 / 5252 HP = 304.65 kW = 304.65 x 0.7457 = 227.14 kW
Result:400 lb-ft at 4000 RPM = 304.65 HP (227.14 kW)
Example 2: Electric Motor in Nm
Problem:An electric motor produces 350 Nm at 6000 RPM. Convert to horsepower.
Solution:Convert to lb-ft: 350 x 0.7376 = 258.16 lb-ft HP = (258.16 x 6000) / 5252 HP = 1,548,960 / 5252 HP = 294.93 HP
Result:350 Nm at 6000 RPM = 294.93 HP (219.90 kW)
Frequently Asked Questions
What is the difference between horsepower and torque?
Torque is a rotational force measured at an instant, while horsepower is a rate of doing work over time. Torque tells you how much twisting force the engine produces, and horsepower tells you how quickly that force can do work. In practical terms, torque determines how strongly a vehicle accelerates at low speeds and how well it handles loads, while horsepower determines top speed and sustained high-speed performance. An engine with high torque but low RPM can still have modest horsepower.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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