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Flow Rate Converter

Convert a volumetric flow rate between metric units (mL/s, mL/min, L/s, L/min, L/h, m³/s, m³/min, m³/h, m³/day), US units (gallons per second, minute, hour and day, million gallons per day, cubic feet per second and minute, oil barrels per day) and UK gallons per minute and hour. Factors are exact, derived from the legal liter, foot and gallon definitions.

Unit Converters Runs in your browser

Convert a Volumetric Flow Rate

US and UK gallons differ (3.785411784 L versus 4.54609 L), so check which one your pump or tap rating uses.

Decimals and scientific notation such as 2.5e3 are accepted.
Automatic shows exact results in full and rounds long ones to 12 significant digits.

How to Use the Flow Rate

  1. Enter the number in Value to convert.
  2. Choose the flow unit you have in From unit and the one you need in To unit; the lists are grouped by system.
  3. The result, the multiplier and the formula appear straight away under the form. Swap units reverses the direction.
  4. Check the table for the same value in every unit, set Precision if you want fewer digits, or press Copy result.

About This Tool

Plumbers sizing pipes and pumps, HVAC technicians working in CFM, gardeners checking irrigation, water and wastewater engineers using MGD, and oil and gas staff converting barrels per day.

Input: A number and a unit  ·  Output: The same flow rate in every unit.

Features and Limitations

Features

  • Nineteen units across metric, US customary and imperial UK.
  • Exact factors: 1 US gpm = 0.0630901964 L/s, 1 CFM = 0.471947443 L/s, 1 bbl/day = 0.0018401307283333 L/s.
  • Formula and one-unit equivalence for every pair.
  • Rejects negative flow and shows tiny or huge numbers in scientific notation.

Limitations

  • This is volumetric flow (volume per time). Mass flow (kg/s) needs the fluid density and is not converted.
  • Gas flow in CFM is often quoted at standard conditions (SCFM); converting between actual and standard flow needs pressure and temperature and is not done here.
  • Results are computed in your browser; nothing you enter is sent to a server.

Example

10 L/min = 2.6417 US gpm = 2.1997 UK gpm = 0.6 m³/h. 100 CFM = 169.9 m³/h = 47.19 L/s. 1 MGD = 3785.41 m³/day = 43.81 L/s.

Frequently Asked Questions

How do I convert L/min to gallons per minute?

Divide by 3.785411784 for US gallons or by 4.54609 for UK gallons. 20 L/min is 5.28 US gpm or 4.40 UK gpm.

What is CFM?

Cubic feet per minute, the usual unit for air flow from fans, compressors and ventilation in the US. 1 CFM ≈ 1.699 m³/h ≈ 0.472 L/s.

How much is one barrel per day?

An oil barrel is 42 US gallons (158.987 L), so 1 bbl/day is 158.987 L per day, about 0.11 L/min.

Can I convert flow to pipe velocity?

Velocity equals flow divided by the pipe's internal area. This tool converts the flow units; divide the result in m³/s by the area in m² to get m/s.

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