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Flow Converter – Convert Flow Rate Units Online

Convert volumetric flow between m³/s, litres per minute, gallons per minute and more.

Flow Rate Converter What is this? ↓
About the Flow Rate Converter

What is the Flow Rate Converter?

A flow rate converter changes a volumetric flow between metric and imperial units used for water, air and fluids.

Why use this calculator?

Plumbing, HVAC, pumps and aquariums each specify flow differently, so converting flow rates keeps systems matched.

How to use it

  1. Enter the flow rate value.
  2. Choose the source and target units.
  3. Read the converted flow rate.

Formula

All units are defined relative to cubic meters per second.
US gallon per minute (gpm) is a common pump and plumbing rating.
Frequently Asked Questions
How many litres per minute is 1 gpm?
One US gallon per minute is about 3.785 litres per minute.
What is volumetric flow rate?
It is the volume of fluid passing a point per unit time, for example litres per second or cubic meters per hour.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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