Industrial Unit Converter — Flow, Torque, Power, Temperature
Units that get mixed on site: flow m³/h, L/min, gpm; torque N·m, kgf·cm, lbf·ft; power kW, horsepower (hp, PS), kcal/h, refrigeration tons; °C, °F, K.
Definitions and factors
- 1 L = 1 dm³ = 0.001 m³, 1 m³/h = 16.667 L/min
- US gallon = 231 in³ = 3.785 411 784 L, imperial gallon = 4.546 09 L
- 1 kgf = 9.806 65 N, 1 lbf = 0.453 592 37 kg × 9.806 65 m/s² ≈ 4.448 222 N
- 1 kgf·m = 9.806 65 N·m, 1 lbf·ft ≈ 1.355 818 N·m
- 1 hp = 550 ft·lbf/s ≈ 745.70 W, 1 PS = 75 kgf·m/s = 735.498 75 W
- 1 kcal/h = 4186.8 J ÷ 3600 s = 1.163 W, 1 ton of refrigeration = 12 000 Btu/h ≈ 3516.85 W
- °F = °C × 9/5 + 32, K = °C + 273.15, °R = K × 9/5
Two horsepowers are in use: imperial/US horsepower (hp, 550 ft·lbf/s ≈ 0.7457 kW) and metric horsepower (PS, CV, 75 kgf·m/s ≈ 0.7355 kW), about 1.4 % apart. kcal uses the international calorie (4.1868 J). Refrigeration tons differ between countries; only the US ton (12 000 Btu/h) is used here.
kW ↔ horsepower (motor sizes, calculated)
| kW | hp (550 ft·lbf/s) | PS (metric) |
|---|---|---|
| 0.4 | 0.5364 | 0.5438 |
| 0.75 | 1.006 | 1.02 |
| 1.5 | 2.012 | 2.039 |
| 2.2 | 2.95 | 2.991 |
| 3.7 | 4.962 | 5.031 |
| 5.5 | 7.376 | 7.478 |
| 7.5 | 10.06 | 10.2 |
| 11 | 14.75 | 14.96 |
| 15 | 20.12 | 20.39 |
| 18.5 | 24.81 | 25.15 |
| 22 | 29.5 | 29.91 |
| 30 | 40.23 | 40.79 |
| 37 | 49.62 | 50.31 |
| 45 | 60.35 | 61.18 |
| 55 | 73.76 | 74.78 |
| 75 | 100.6 | 102 |
Calculated values. Motor ratings come in separate kW and horsepower series, so a nameplate «HP» does not match this table to the decimal.
Flow table
| m³/h | L/min | L/s | gpm (US) | cfm |
|---|---|---|---|---|
| 1 | 16.667 | 0.27778 | 4.4029 | 0.58858 |
| 5 | 83.333 | 1.3889 | 22.014 | 2.9429 |
| 10 | 166.67 | 2.7778 | 44.029 | 5.8858 |
| 50 | 833.33 | 13.889 | 220.14 | 29.429 |
| 100 | 1666.7 | 27.778 | 440.29 | 58.858 |
Torque table
| N·m | kgf·cm | kgf·m | lbf·ft | lbf·in |
|---|---|---|---|---|
| 0.1 | 1.0197 | 0.010197 | 0.073756 | 0.88507 |
| 1 | 10.197 | 0.10197 | 0.73756 | 8.8507 |
| 10 | 101.97 | 1.0197 | 7.3756 | 88.507 |
| 100 | 1019.7 | 10.197 | 73.756 | 885.07 |
FAQ
How many horsepower is 1 kW?
About 1.341 hp (imperial/US) or 1.360 PS (metric). Conversely, 1 hp ≈ 0.7457 kW and 1 PS ≈ 0.7355 kW.
How do I convert kgf·cm to N·m?
1 kgf·cm = 0.098 066 5 N·m, so multiply N·m by about 10.197 to get kgf·cm. Example: 1.27 N·m ≈ 12.95 kgf·cm.
m³/h to L/min?
1 m³/h = 1000 L ÷ 60 min ≈ 16.667 L/min. A 60 L/min pump moves 3.6 m³/h.
Can it convert Nm³/h (normal)?
No. Nm³/h is a gas volume referred to standard temperature and pressure, so converting to m³/h needs the actual temperature and pressure and the reference conditions of that Nm³, which differ between industries and makers — check the flowmeter specification.