CalcLibrary

Flow Rate Converter

Convert one known flow rate between L/s, L/min, L/h, mL/min, m³/h, m³/s, US gpm, UK gpm, and CFM. Built for pump specs, faucet ratings, irrigation quotes, filters, aquariums, and airflow comparisons.

Examples

Convert a 30 US gpm pump listing into L/min for a side-by-side spec check.

Converted flow rate
113.5624 L/min
m³/s conversion path
30 US gpm -> 0.001892705892 m³/s -> 113.5624 L/min; 1 US gpm = 0.000063090196 m³/s, 1 L/min = 0.000016666667 m³/s

The result is larger because the target flow unit is smaller. One source unit contains about 3.79 target units.

Unit converter only — this page does not size pumps, estimate pipe losses, analyze pressure drop, design HVAC ductwork, or estimate water-use cost.

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Examples

How It Works

Formula

r=v×ffromftor = v \times \dfrac{f_{\text{from}}}{f_{\text{to}}}

Variables

vv

Input flow rate

rr

Converted flow rate

ffromf_{\text{from}}

m³/s factor of the source unit(m³/s)

ftof_{\text{to}}

m³/s factor of the target unit(m³/s)

The calculator uses cubic meters per second as the canonical base unit. Your value is converted into m³/s first, then into the target unit. The comparison panel shows the same flow in practical reference units so you can line up a product page, quote, or manual quickly without switching selectors repeatedly.

Reference factors used by the calculator (m³/s per unit):

  • 1 L/s = 0.001 m³/s
  • 1 L/min = 0.000016666666667 m³/s
  • 1 L/h = 0.000000277777778 m³/s
  • 1 mL/min = 0.000000016666667 m³/s
  • 1 m³/h = 0.000277777777778 m³/s
  • 1 m³/s = 1 m³/s
  • 1 US gpm = 0.0000630901964 m³/s
  • 1 UK gpm = 0.000075768166667 m³/s
  • 1 CFM = 0.0004719474432 m³/s

The calculator multiplies the entered value by the source factor to get m³/s, then divides by the target factor to reach the chosen unit.

Frequently Asked Questions

01How is flow rate different from volume?
Volume is a fixed amount, such as a 200-liter tank. Flow rate adds time, such as 30 liters per minute. Use this tool when you need volume per second, minute, or hour rather than the size of a container.
02Why do US gpm and UK gpm give different results?
Because a US gallon and a UK (Imperial) gallon are not the same size. This converter keeps them separate with fixed factors, so pump and faucet specs do not get mixed accidentally.
03Why is CFM included in a flow-rate converter?
CFM means cubic feet per minute, so it is still a physical volume-per-time unit. It is common on ventilation, duct, fan, and filter specifications where the metric equivalent is often m³/h or m³/s.
04How does the conversion path stay consistent?
Every supported unit is defined as a fixed amount of cubic meters per second. The calculator always converts the source value into m³/s first, then converts from m³/s into the target unit.
05What does this tool not do?
It does not size pumps, estimate pipe losses, analyze pressure drop, design ducts, interpret pressure, or estimate water-use cost. It only restates one known flow rate in another unit.

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