Flow Rate Converter

Runs locally in your browser. Nothing leaves your device.

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

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

Metric - cubic metres

Cubic metre per day (m³/d)
1.44
Cubic metre per hour (m³/h)
0.06
Cubic metre per minute (m³/min)
0.001
Cubic metre per second (m³/s)
0.0000166666667

US gallons

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

Imperial gallons

Imperial gallons per hour (Imp gal/h)
13.1981549
Imperial gallons per minute (Imp gal/min)
0.219969248

Cubic inch and cubic foot

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

Oil industry

US oil barrels per day (bbl (US oil)/d)
9.05732751

How it works

  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.

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.

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.

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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