A cubic metre per second (m3s−1, m3/s, cumecs or cubic meter per second in American English) is a derived SI unit of volumetric flow rate equal to that of a stere or cube with sides of one metre (~39.37 in) in length exchanged or moving each second. It is popularly used for water flow, especially in rivers and streams, and fractions for HVAC values measuring air flow.
| (cubic foot) per minute | liter per hour | liter per second | (cubic meter) per minute | (cubic foot) per second | (cubic inch) per minute | megaliter per day | kiloliter per hour |
|---|---|---|---|---|---|---|---|
| 1 | 1,699.0107955 | 0.4719474 | 0.0283168 | 0.0166667 | 1 728 | 0.0407763 | 1.6990108 |
| 0.0005886 | 1 | 0.0002778 | 1.6666666666667 × 10-5 | 9.8096296448579 × 10-6 | 1.0170624 | 2.4 × 10-5 | 0.001 |
| 2.1188800 | 3 600 | 1 | 0.06 | 0.0353147 | 3,661.4246457 | 0.0864 | 3.6 |
| 35.3146667 | 60 000 | 16.6666667 | 1 | 0.5885778 | 61,023.7440947 | 1.44 | 60 |
| 60 | 101,940.6477312 | 28.3168466 | 1.6990108 | 1 | 103 680 | 2.4465755 | 101.9406477 |
| 0.0005787 | 0.9832238 | 0.0002731 | 1.6387064 × 10-5 | 9.6450617283951 × 10-6 | 1 | 2.359737216 × 10-5 | 0.0009832 |
| 24.5240741 | 41,666.6666667 | 11.5740741 | 0.6944444 | 0.4087346 | 42,377.6000658 | 1 | 41.6666667 |
| 0.5885778 | 1 000 | 0.2777778 | 0.0166667 | 0.0098096 | 1,017.0624016 | 0.024 | 1 |
| 10 (cubic meter) per second = 10 (cubic meter) per second |
| 20 (cubic meter) per second = 20 (cubic meter) per second |
| 30 (cubic meter) per second = 30 (cubic meter) per second |
| 40 (cubic meter) per second = 40 (cubic meter) per second |
| 50 (cubic meter) per second = 50 (cubic meter) per second |
| 60 (cubic meter) per second = 60 (cubic meter) per second |
| 70 (cubic meter) per second = 70 (cubic meter) per second |
| 80 (cubic meter) per second = 80 (cubic meter) per second |
| 90 (cubic meter) per second = 90 (cubic meter) per second |
| 100 (cubic meter) per second = 100 (cubic meter) per second |