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Quick guide
Understand the calculation
Volumetric flow rate describes how much volume passes per unit of time. This tool converts the same reading across 23 laboratory and engineering units, from nanolitres per minute (nL/min) to cubic metres per second (m³/s). To convert a volume without time, use the Length, Area and Volume Converter.
When to use this tool
Use it to compare laboratory pump readings, work with microfluidic flow rates in microlitres (µL) and nanolitres (nL), express irrigation flow in L/min or m³/h, and read equipment specifications in gallons or cubic feet per minute. From the Physics, Chemistry, Biology and Geosciences pages, you can also open it as a floating tool alongside a calculator.
How the conversion works
Type only the number and choose the value and result units. Signed values, a decimal comma or point, and scientific notation are supported: 2.5e-3 means 0.0025. The conversion changes volume and time: to go from L/min to m³/h, divide by 1000 and multiply by 60. Open “How this conversion works” to see those two changes separately. Changing or swapping units keeps the number you typed and interprets it in the new value unit. Choose 6 or 10 significant figures: these are the digits retained when rounding the result. In the relation between the units, = indicates an exact value and ≈ a rounded one, so an exact relation may show more digits than the result. “Show all equivalents” displays the same flow rate in the other 22 units.
It only changes the flow rate unit: it does not correct pressure or temperature, or convert mass flow, velocity or gas units tied to specific reference conditions, such as SCCM, SCFM or NL/min. It does not calculate filling times. A day (d) equals 24 hours. If a result is too large or too close to zero to display, “—” appears and the other equivalents remain available.
Verified examples
- Litres per minute to cubic metres per hour
1 L/min = 0.001 × 60 m³/h = 0.06 m³/h - Litres per second and cubic metres per hour
1 L/s = 3.6 m³/h; 1 m³/h ≈ 0.277778 L/s - Millilitres per hour to microlitres per minute
1 mL/h = (1000/60) µL/min ≈ 16.6667 µL/min - Laboratory reading
250 µL/min = 15 mL/h - CFM: cubic feet per minute
1 ft³/min = 1.69901079552 m³/h - GPM: gallons per minute
1 gal (US)/min = 3.785411784 L/min; 1 gal (imp.)/min = 4.54609 L/min
Frequently asked questions
How do I convert L/min to m³/h?
Multiply by 0.06: each litre is 0.001 m³ and each hour contains 60 minutes. For example, 25 L/min = 1.5 m³/h. To go the other way, divide by 0.06: 1 m³/h ≈ 16.6667 L/min.
How many L/s is 1 m³/h?
1 m³/h ≈ 0.277778 L/s, because 1 m³ is 1000 L and an hour has 3600 seconds: 1000/3600. Conversely, 1 L/s = 3.6 m³/h exactly. For example, an 18 m³/h pump delivers 5 L/s.
How do I convert mL/h to µL/min?
Multiply by 1000 to change millilitres to microlitres, then divide by 60 to change per hour to per minute. So 1 mL/h ≈ 16.6667 µL/min and 15 mL/h = 250 µL/min.
Are mL/min and cm³/min the same?
Yes. A millilitre equals exactly one cubic centimetre, so 1 mL/min = 1 cm³/min. Both options are included to match the unit written on an equipment specification.
Does GPM mean US or imperial gallons?
GPM means gallons per minute and needs a stated convention. The US liquid gallon equals 231 cubic inches, or 3.785411784 L; the imperial gallon (imp.) equals 4.54609 L. If the specification does not say, check with the manufacturer: the imperial gallon is about 20 % larger.
Can I convert CFM and SCFM with the same factor?
CFM means ft³/min: cubic feet per minute, using the international foot of 0.3048 m. SCFM expresses gas flow at a specified reference temperature and pressure. Relating it to flow under operating conditions requires those conditions and a gas model. SCFM, SCCM and other reference units are not included.
Can I convert flow rate to mass or velocity?
Converting volumetric flow to mass flow requires density. Obtaining average velocity requires the cross-sectional flow area. These are different calculations that need additional inputs and are outside this unit converter.