| Engine Speed | Torque |
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Torque, Horsepower, and the Number 5252
Engine torque is the rotational force at the crankshaft, while horsepower measures the rate of doing work. They are tied together by RPM through one equation: horsepower equals torque times RPM divided by 5252. Know any two of the three and you can find the third, which is exactly what this calculator does.
Why Curves Cross at 5252
On any dyno graph, the torque and horsepower lines intersect at 5252 RPM. It is not a coincidence; it falls straight out of the formula, because at that engine speed the multiplier between the two becomes one. Below 5252 torque reads higher than horsepower, and above it horsepower pulls ahead.
What This Means for Performance
Torque is what you feel pushing you back in the seat; horsepower is what carries that push to high speed. A big, lazy engine makes huge torque at low RPM, while a small, screaming engine makes its power by spinning fast. Gearing lets either one deliver strong acceleration at the wheels.
Frequently Asked Questions
Is torque or horsepower more important?
Both matter. Torque determines low-end pull and how the car feels; horsepower sets top-end performance. Gearing multiplies torque, so peak power often decides outright acceleration.
Why does the same power give different torque?
Because torque depends on RPM. The same horsepower at a lower engine speed means more torque, and at a higher speed, less. That is the whole basis of gearing.
What units should I use?
This tool shows pound-feet and newton-metres for torque, plus kilowatts and metric PS for power, so you can match whatever a spec sheet uses.