How many units does Flow rate have?

9 units with the base unit m³/s.

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Flow rate

Flow rate is volume per time, not volume. A pipe volume in litres cannot be converted into l/min directly; the time base is required. Flow rate is used in heating, plumbing, process engineering and irrigation.

Flow rate
Unit	Symbol	Formula
Cubic metre per second	m³/s	base
Cubic metre per hour	m³/h	1 m³/h = 0.0002777777777777778 m³/s
Litre per second	l/s	1 l/s = 0.001 m³/s
Litre per minute	l/min	1 l/min = 0.0000166666666666667 m³/s
Litre per hour	l/h	1 l/h = 0.000000277777777777778 m³/s
Millilitre per minute	ml/min	1 ml/min = 0.000000016666666666667 m³/s
US gallon per minute	US gal/min	1 US gal/min = 0.0000630901964 m³/s
US gallon per hour	US gal/h	1 US gal/h = 0.00000105150327 m³/s
Cubic foot per minute	ft³/min	1 ft³/min = 0.0004719474432 m³/s

Direct conversions

Every maintained pair of this family with formula, table and common mistake.

All conversions

Cubic metre per hour to Litre per minutem³/h → l/minFlow rate Litre per minute to Cubic metre per hourl/min → m³/hFlow rate Litre per second to Cubic metre per hourl/s → m³/hFlow rate Cubic metre per hour to Litre per secondm³/h → l/sFlow rate Litre per minute to Litre per secondl/min → l/sFlow rate Litre per second to Litre per minutel/s → l/minFlow rate US gallon per minute to Litre per minuteUS gal/min → l/minFlow rate Litre per minute to US gallon per minutel/min → US gal/minFlow rate Cubic metre per hour to Cubic foot per minutem³/h → ft³/minFlow rate Litre per hour to Litre per minutel/h → l/minFlow rate Litre per minute to Litre per hourl/min → l/hFlow rate Millilitre per minute to Litre per minuteml/min → l/minFlow rate

Base unitm³/s

UnitCloud is a calculation aid. Standards, contracts, medical decisions, engineering approvals and official requirements need original sources.

Units9

Every unit of this family converts through the same base unit.

Direct conversions12

Maintained pairs with their own page, table and common mistake.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Search and practice paths

FormulaTableExamplesCommon mistakeEveryday/engineeringExcel/CSVBatch converterPrint view

Flow rateFlow rate in heating and plumbing Data rateReading internet speed correctly

Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Flow rate. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.