Reference table
Flow rate: m³/h, l/min and l/s
Heating and plumbing work in cubic metres per hour, pumps and fittings often in litres per minute. This table shows the same flow rate in every notation.
| m³/h | l/min | l/s | US gal/min |
|---|---|---|---|
| 0.5 | 8.33333333 l/min | 0.13888889 l/s | 2.20143377 US gal/min |
| 1 | 16.66666667 l/min | 0.27777778 l/s | 4.40286754 US gal/min |
| 1.5 | 25 l/min | 0.41666667 l/s | 6.60430131 US gal/min |
| 2 | 33.33333333 l/min | 0.55555556 l/s | 8.80573508 US gal/min |
| 2.5 | 41.66666667 l/min | 0.69444444 l/s | 11.00716885 US gal/min |
| 3 | 50 l/min | 0.83333333 l/s | 13.20860262 US gal/min |
| 5 | 83.33333333 l/min | 1.38888889 l/s | 22.0143377 US gal/min |
| 10 | 166.66666667 l/min | 2.77777778 l/s | 44.02867539 US gal/min |
| 20 | 333.33333333 l/min | 5.55555556 l/s | 88.05735079 US gal/min |
Volumetric flow is independent of pipe diameter; the diameter only affects flow velocity and pressure loss. One litre per minute equals about 0.06 m³/h. Sizing circuits and pumps additionally requires pressure and temperature difference — flow rate alone says nothing about the power transferred.