This accurate rpm to hp calculator helps convert Revolutions Per Minute (RPM) into Horsepower (HP), using Horsepower (HP) = (Torque (lb-ft) × RPM) ÷ 5,252 formula.
If you have an engine running at 3,000 RPM with a torque of 150 ft-lbs, the calculator can quickly determine the horsepower output, considering all relevant variables.
RPM to HP Calculator
| RPM | Torque (ft-lbs) | Horsepower |
|---|---|---|
| 1000 | 150 | 28.5 |
| 1200 | 160 | 30.6 |
| 1500 | 160 | 45.7 |
| 1800 | 170 | 56.8 |
| 2000 | 180 | 68.5 |
| 2200 | 190 | 79.6 |
| 2500 | 200 | 95.2 |
| 2600 | 210 | 111.4 |
| 2700 | 210 | 106.3 |
| 2800 | 220 | 122.9 |
| 2900 | 230 | 139.5 |
| 3000 | 220 | 125.7 |
| 3200 | 230 | 145.1 |
| 3500 | 240 | 160.0 |
| 3600 | 250 | 179.4 |
| 3700 | 250 | 179.4 |
| 4000 | 230 | 175.2 |
| 4200 | 240 | 190.1 |
| 4500 | 220 | 188.5 |
| 4800 | 210 | 198.6 |
| 5000 | 210 | 200.0 |
| 5500 | 200 | 207.5 |
| 6000 | 190 | 214.9 |
| 6500 | 180 | 221.4 |
| 10000 | 150 | 285.7 |
RPM to Horsepower Conversion Formula
Horsepower = (Torque × RPM) ÷ 5,252Where:
- Torque is measured in foot-pounds (ft-lbs)
- RPM is the engine’s rotational speed
- 5,252 is a constant derived from the relationship between torque and horsepower
Let’s calculate the horsepower for an engine with:
- Torque: 200 ft-lbs
- RPM: 4,000
HP = (200 × 4,000) ÷ 5,252 = 152.32 HPHow to Convert RPM to HP?
Converting RPM to HP requires these detailed steps:
- Measure the torque i.e. 1800
- Record the RPM at which the torque measurement was taken
- Apply the conversion formula: Multiply torque by RPM and Divide the result by 5,252
Let’s convert measurements from an engine test:
- Measured torque: 180 ft-lbs
- Engine speed: 3,500 RPM
Calculation:
Multiply: 180 × 3,500 = 630,000
Divide by 5,252: 630,000 ÷ 5,252 = 119.95 HP
What is 1500 RPM to HP?
Assuming a torque of 160 ft-lbs at 1500 RPM:
HP = (160 × 1500) ÷ 5,252 = 45.7 HP
This relatively low horsepower output at 1500 RPM is typical for many engines, as they generally produce peak power at higher RPMs.
References
- SAE International – Society of Automotive Engineers https://www.sae.org/standards/
- Massachusetts Institute of Technology – Engine Dynamics https://ocw.mit.edu/courses/mechanical-engineering/
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