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Flow Rate Converter

Instantly convert volumetric flow rates between L/min, m³/h, US gal/min, Imp gal/min, ft³/min and US oil barrels per day.

Use a comma or period as the decimal separator; do not use thousands separators.

All units

Metric - litres and small volumes

Use as target unit: Litre per day
Litre per day (L/d)
1,440
Use as target unit: Millilitre per minute
Millilitre per minute (mL/min)
1,000
Use as target unit: Litre per hour
Litre per hour (L/h)
60
Use as target unit: Millilitre per second
Millilitre per second (mL/s)
16.6666667
Use as target unit: Litre per minute
Litre per minute (L/min)
From
1
Use as target unit: Litre per second
Litre per second (L/s)
0.0166666667

Metric - cubic metres

Use as target unit: Cubic metre per day
Cubic metre per day (m³/d)
1.44
Use as target unit: Cubic metre per hour
Cubic metre per hour (m³/h)
0.06
Use as target unit: Cubic metre per minute
Cubic metre per minute (m³/min)
0.001
Use as target unit: Cubic metre per second
Cubic metre per second (m³/s)
0.0000166666667

US gallons

Use as target unit: US gallons per day
US gallons per day (US gal/d)
380.407755
Use as target unit: US gallons per hour
US gallons per hour (US gal/h)
15.8503231
Use as target unit: US gallons per minute
US gallons per minute (US gal/min)
To
0.264172052
Use as target unit: US gallons per second
US gallons per second (US gal/s)
0.00440286754

Imperial gallons

Use as target unit: Imperial gallons per hour
Imperial gallons per hour (Imp gal/h)
13.1981549
Use as target unit: Imperial gallons per minute
Imperial gallons per minute (Imp gal/min)
0.219969248

Cubic inch and cubic foot

Use as target unit: Cubic inch per minute
Cubic inch per minute (in³/min)
61.0237441
Use as target unit: Cubic foot per hour
Cubic foot per hour (ft³/h)
2.11888
Use as target unit: Cubic inch per second
Cubic inch per second (in³/s)
1.0170624
Use as target unit: Cubic foot per minute
Cubic foot per minute (ft³/min)
0.0353146667
Use as target unit: Cubic foot per second
Cubic foot per second (ft³/s)
0.000588577779

Oil industry

Use as target unit: US oil barrels per day
US oil barrels per day (bbl (US oil)/d)
9.05732751
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Good to know

The flow rate converter converts directly in your browser between metric cubic meter, liter, US gallon, imperial gallon, and oil-industry units, following Q = dV/dt. 1 US gal equals 3.785411784 L, 1 imperial gal 4.54609 L, and one US oil barrel equals 42 US liquid gallons.

Typical searches include liters per minute to m3/h, convert flow rate, and gpm to l/min. Calculation runs locally in the browser. Important: this tool converts volumetric flow — mass flow additionally needs density, flow velocity needs cross-section, and US gal/min is a different unit than imperial gal/min.

Typical use cases

Compare pump output between units

Convert manufacturer specs in gal/min or l/min to compare pumps from different markets.

Convert flow rates for pipe planning

Convert m³/h to l/s or gal/min to compare system and pipe data from different standards.

Tips for better results

Don't confuse volumetric flow with mass flow

For mass flow (kg/s), the medium's density is additionally required — this tool converts volumetric flow exclusively.

Distinguish US and imperial gallons per minute

US gal/min and imperial gal/min are different units — check which system your source uses.

How it works

Step by step

  1. 1

    Enter value and source unit

    Enter the flow rate value and choose the source unit.

  2. 2

    Choose the target unit

    Choose the target unit from one of the five groups.

  3. 3

    Copy the result

    Copy one or all results for further use.

Features

Five unit groups

Metric (cubic meter and liter), US gallons, imperial gallons, and oil industry are separated.

Local conversion

Calculation happens directly in the browser, without transmission to a server.

Exact volume definitions

US gallon, imperial gallon, and oil barrel are based on exact, transparent definitions.

Frequently asked questions

Can I convert mass flow?

Not directly — mass flow additionally requires the medium's density. This tool converts volumetric flow exclusively.

Are my inputs uploaded?

No. Conversion runs entirely locally in the browser.

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