Flow Rate Converter
Convert liters per second and minute, cubic meters per hour, US and UK gallons per minute, cubic feet per second and minute, and milliliters per minute.
· CalcFlow Editorial
1 GPM = 3.7854118 L/min
Results shown are estimates for informational purposes only. Nothing on CalcFlow is financial, tax, legal, or medical advice. Always consult a qualified professional before making important decisions.
Common Flow Rate Conversions
| US gallons per minute | Liters per minute | Liters per second | Cubic meters per hour | Cubic meters per second | UK gallons per minute |
|---|---|---|---|---|---|
| 1 GPM | 3.7854118 | 0.063090196 | 0.22712471 | 0.000063090196 | 0.83267418 |
| 2 GPM | 7.5708236 | 0.12618039 | 0.45424941 | 0.00012618039 | 1.6653484 |
| 5 GPM | 18.927059 | 0.31545098 | 1.1356235 | 0.00031545098 | 4.1633709 |
| 10 GPM | 37.854118 | 0.63090196 | 2.2712471 | 0.00063090196 | 8.3267418 |
| 20 GPM | 75.708236 | 1.2618039 | 4.5424941 | 0.0012618039 | 16.653484 |
| 50 GPM | 189.27059 | 3.1545098 | 11.356235 | 0.0031545098 | 41.633709 |
| 100 GPM | 378.54118 | 6.3090196 | 22.712471 | 0.0063090196 | 83.267418 |
| 500 GPM | 1,892.7059 | 31.545098 | 113.56235 | 0.031545098 | 416.33709 |
| 1,000 GPM | 3,785.4118 | 63.090196 | 227.12471 | 0.063090196 | 832.67418 |
Popular Flow Rate Conversions
Formula
cubic meters per second = value x unit factor (1 GPM = 3.785411784 L / 60 s; 1 m3/h = 1/3,600 m3/s)Understanding Flow Rate Conversion
Flow rate is volume per unit of time. Plumbing and pumps in the US are rated in gallons per minute, while metric plumbing uses liters per minute or cubic meters per hour. Air handling uses cubic feet per minute, and rivers are measured in cubic meters or cubic feet per second. The same number means different things for US and UK gallons, so check which one a pump label uses.
Tips and Best Practices
- 1Multiply US gallons per minute by 3.785 to get liters per minute.
- 2Divide cubic meters per hour by 3.6 to get liters per second.
- 3Shower heads in the US are limited to about 2.5 GPM, roughly 9.5 L/min.
Real-World Example
A pump rated at 10 GPM moves 10 x 3.785411784 = 37.85 liters per minute, which is 2.27 cubic meters per hour.
Common Mistakes to Avoid
- Mixing US and UK GPM.
- Confusing m3/h with m3/s, a factor of 3,600.
- Reading a pump curve at the wrong head or pressure rather than the quoted flow.
How to Use
- Pick the unit you have in the left selector and the unit you want in the right selector.
- Type a number in either box; the other box updates instantly.
- Use the swap button to reverse the direction and Copy result to copy the answer.
Frequently Asked Questions
How many liters per minute is 1 GPM?
How do I convert m3/h to L/min?
What is CFM?
Sources: NIST SP 811 (US gallon, cubic foot); UK imperial gallon = 4.54609 L.