Why divide by 5252?
5252 is the constant that relates horsepower to pound-feet of torque at a given RPM in US customary units.
ATV Calculator
ATV Horsepower Calculator
Convert a torque figure and engine speed into estimated horsepower. This is the common SAE relationship used for gasoline engines.
Results
Values update after you calculate. Empty or invalid inputs will not invent a number.
Enter the values and choose Calculate to see estimates.
How it works
Enter torque in pound-feet and the RPM where that torque was measured. Horsepower is torque times RPM divided by 5252.
Horsepower = torque (lb-ft) × RPM ÷ 5252. Kilowatts = horsepower × 0.7457.
These results are estimates for planning only. They are not OEM specifications, safety certifications, or professional mechanical, legal, or financial advice.
Horsepower Calculator FAQs
Is this wheel horsepower or crank horsepower?
The formula does not know where torque was measured. If you enter crank torque you get crank horsepower; wheel torque gives a wheel estimate.
Can I use Newton-metres?
Convert N·m to lb-ft first (divide by 1.3558), then enter that torque here.
Related ATV calculators
Torque Calculator
Calculate ATV torque from horsepower and RPM using the 5252 horsepower relationship.
Fuel Injector Size Calculator
Estimate ATV injector flow in lb/hr and cc/min from horsepower, cylinder count, duty cycle, and fuel type.
Engine Displacement Calculator
Calculate ATV engine displacement in cc, cubic inches, and litres from bore, stroke, and cylinder count.
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