Torque From Horsepower
Calculator
Results
- Torque (lb·ft)
- 218.833333
- Torque (N·m)
- 296.698161
- Power (kW)
- 186.424967
Results
| Torque (lb·ft) | 218.833333 |
| Torque (N·m) | 296.698161 |
| Power (kW) | 186.424967 |
formula-map diagram
- Torque (lb·ft)
- 218.833333
- Torque (N·m)
- 296.698161
- Power (kW)
- 186.424967
Formula breakdown
Formula
torque (lb·ft) = hp × 5252 ÷ rpm= 218.83333333333
Note
Simplified model: results use idealised textbook relationships and ignore real-world factors such as driving style, load, temperature, aerodynamic and rolling losses, drivetrain efficiency, tyre and brake condition and road surface. CO2 figures are tailpipe only, based on the standard 2.31 kg CO2 per litre of petrol (2.68 kg per litre of diesel), and exclude fuel production and distribution. Use them as estimates, not as legal, safety or load-rating figures.
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See all →Frequently asked questions
How is torque derived from horsepower and RPM?+
Rearranging the standard relationship gives: torque (lb-ft) = horsepower × 5,252 ÷ RPM. This shows that for a fixed horsepower figure, torque is inversely proportional to RPM — the same horsepower produces less torque at higher RPM and more torque at lower RPM.
Why does the same horsepower rating produce very different torque values at different RPMs?+
Because torque and RPM trade off to produce a given power output — a high-revving engine reaches its horsepower peak with relatively low torque at high RPM, while a low-revving engine needs much higher torque at low RPM to produce that same horsepower figure.
What's a common misconception when comparing two engines' torque from their peak horsepower alone?+
You can't compare torque characteristics between two engines just from their peak horsepower numbers, because the RPM at which that horsepower is produced changes the derived torque substantially. A 300 hp engine peaking at 4,000 RPM has significantly more torque at that point than a 300 hp engine peaking at 7,000 RPM.
Does this calculation give torque at every RPM, or just one point?+
It calculates torque at the single RPM you enter alongside the horsepower figure. Since real engines produce different horsepower at different RPMs (following a power curve), this only gives an accurate torque figure if the horsepower value entered actually corresponds to that specific RPM.
Why is understanding this relationship useful for gearing or performance work?+
Because low-end torque (usually at lower RPM) is what determines how strong acceleration feels from a stop or how well a vehicle can tow or climb, converting a horsepower spec into torque at relevant RPMs helps evaluate real-world usability rather than relying on a single peak horsepower number.