Flow Rate Unit Converter
One flow, every unit: L/s, m³/h, US gpm, UK gpm, cfm, MGD side by side.
US and UK gallons differ by 20% — a classic source of pump-order errors on international projects.
Formula
Flow Rate Unit Converter is a free flow rate converter for process, mechanical and water engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Flow Rate Unit Converter
One flow, every unit: L/s, m³/h, US gpm, UK gpm, cfm, MGD side by side. The calculation implements 1 L/s = 3.6 m³/h = 15.85 US gpm = 13.20 imp gpm = 2.119 cfm (NIST SP 811 — unit conversion). US and UK gallons differ by 20% — a classic source of pump-order errors on international projects.
How to use Flow Rate Unit Converter
- 1Enter Flow rate in L/s.
- 2Read Cubic metres/hour, US gallons/min, UK gallons/min instantly — no submit button needed.
- 3Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Flow Rate Unit Converter?
- ✓Implements the standard formula — 1 L/s = 3.6 m³/h = 15.85 US gpm = 13.20 imp gpm = 2.119 cfm
- ✓Reference cited on-page: NIST SP 811 — unit conversion
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Flow Rate Unit Converter use?+
It computes 1 L/s = 3.6 m³/h = 15.85 US gpm = 13.20 imp gpm = 2.119 cfm, per NIST SP 811 — unit conversion. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
US and UK gallons differ by 20% — a classic source of pump-order errors on international projects.
Does this work for any fluid?+
Yes — density and viscosity are inputs (with common fluids suggested in the field hints), so the same physics applies to water, oils, gases and process fluids. Compute always runs in SI internally, so unit mix-ups can't corrupt the result.
Is the Flow Rate Unit Converter free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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