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.
How It Works
Formula
Variables, symbols and units
- Input flow rate
- Converted flow rate
- m³/s factor of the source unit(m³/s)
- m³/s factor of the target unit(m³/s)
Calculation method explained
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
How 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.
Why 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.
Why 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.
How 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.
What 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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