Select torque, shaft power or rotational speed to solve for, or convert power to work rate and constant-power energy. Mechanical hp and metric PS use different factors. Torque needs rotational speed; energy needs duration.
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HP To Ft-Lbs Formula
The following formula is used to calculate the torque, horsepower, or rotational speed when the other two variables are known.
Variables:
- T is torque in pound-feet (lbfยทft), a turning moment rather than energy.
- HP is mechanical horsepower (550 ftยทlbf/s); metric PS is converted separately.
- RPM is the rotational speed in revolutions per minute
To calculate torque in lbfยทft, multiply mechanical horsepower by 33,000/(2ฯ), approximately 5,252.113122, and divide by positive rotational speed in RPM.
| Horsepower (HP) | Torque @ 1000 RPM (ft-lb) | Torque @ 1500 RPM (ft-lb) | Torque @ 2000 RPM (ft-lb) | Torque @ 2500 RPM (ft-lb) | Torque @ 3000 RPM (ft-lb) | Torque @ 4000 RPM (ft-lb) | Torque @ 5000 RPM (ft-lb) |
|---|---|---|---|---|---|---|---|
| 5 | 26.3 | 17.5 | 13.1 | 10.5 | 8.8 | 6.6 | 5.3 |
| 10 | 52.5 | 35.0 | 26.3 | 21.0 | 17.5 | 13.1 | 10.5 |
| 15 | 78.8 | 52.5 | 39.4 | 31.5 | 26.3 | 19.7 | 15.8 |
| 20 | 105.0 | 70.0 | 52.5 | 42.0 | 35.0 | 26.3 | 21.0 |
| 25 | 131.3 | 87.5 | 65.7 | 52.5 | 43.8 | 32.8 | 26.3 |
| 30 | 157.6 | 105.0 | 78.8 | 63.0 | 52.5 | 39.4 | 31.5 |
| 40 | 210.1 | 140.1 | 105.0 | 84.0 | 70.0 | 52.5 | 42.0 |
| 50 | 262.6 | 175.1 | 131.3 | 105.0 | 87.5 | 65.7 | 52.5 |
| 60 | 315.1 | 210.1 | 157.6 | 126.1 | 105.0 | 78.8 | 63.0 |
| 75 | 393.9 | 262.6 | 197.0 | 157.6 | 131.3 | 98.5 | 78.8 |
| 100 | 525.2 | 350.1 | 262.6 | 210.1 | 175.1 | 131.3 | 105.0 |
| 125 | 656.5 | 437.7 | 328.3 | 262.6 | 218.8 | 164.1 | 131.3 |
| 150 | 787.8 | 525.2 | 393.9 | 315.1 | 262.6 | 197.0 | 157.6 |
| 175 | 919.1 | 612.7 | 459.6 | 367.6 | 306.4 | 229.8 | 183.8 |
| 200 | 1050.4 | 700.3 | 525.2 | 420.2 | 350.1 | 262.6 | 210.1 |
| 250 | 1313.0 | 875.4 | 656.5 | 525.2 | 437.7 | 328.3 | 262.6 |
| 300 | 1575.6 | 1050.4 | 787.8 | 630.3 | 525.2 | 393.9 | 315.1 |
| 350 | 1838.2 | 1225.5 | 919.1 | 735.3 | 612.7 | 459.6 | 367.6 |
| 400 | 2100.8 | 1400.6 | 1050.4 | 840.3 | 700.3 | 525.2 | 420.2 |
| 500 | 2626.1 | 1750.7 | 1313.0 | 1050.4 | 875.4 | 656.5 | 525.2 |
| Uses mechanical hp and T(lbfยทft) = HP ร [33,000 รท (2ฯ)] รท RPM. Values are rounded to 1 decimal; 5,252 is a rounded coefficient. NIST power and torque conversions. | |||||||
What is HP To Ft-Lbs?
The hp to ft-lbs calculator is a tool used to convert horsepower (HP) to torque (ft-lbs) or vice versa, given the rotational speed (RPM). Horsepower is a unit of power that measures the rate at which work is done, while torque is a measure of the rotational force applied to an object. The relationship between horsepower, torque, and rotational speed is crucial in various applications, including automotive engineering, machinery, and mechanical systems. Understanding this relationship helps in optimizing performance and efficiency in engines and other rotating equipment.
How to Calculate hp To ft-lbs?
The following steps outline how to calculate the hp to ft-lbs.
- First, determine the horsepower (HP).
- Next, determine the rotational speed (RPM).
- Select Torque from power and speed, choose mechanical hp and enter RPM. The calculator uses T = HP ร [33,000/(2ฯ)] / RPM.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Horsepower (HP) = 150
Rotational Speed (RPM) = 3000
