GPM Calculator

Enter the volume and time in the tool, and the calculator will determine the flow rate of liquid in various units.

Volume:

cm³ ▾

days:

hrs ▾

Flow Rate:

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GPM Calculator

The GPM calculator calculates flow rate in gallons per minute, gallons per hour, and in various Metric and British Imperial units.

What is GPM?

GPM stands for "Gallons per Minute" and measures the flow rate of liquids. It indicates how much liquid passes through pipes, pumps, or other systems per minute. GPM can use either the US liquid gallon or the British imperial gallon.

Definitions:

US Gallon: 3.785 liters
British Imperial Gallon: 4.546 liters

How to Calculate Gallons per Minute?

GPM measures the volumetric flow rate, typically for water or other liquids. Our calculator supports multiple units and converts between LPM to GPM, GPH to GPM, and more.

Manually, measure the time to fill a container with a known volume. For example, filling a 1-gallon container in 10 seconds gives a flow rate of 6 GPM (60 ÷ 10 = 6).

Formula:

GPM = Volume ÷ Time

Steps to measure GPM:

Use a container and record the time to fill it.
Convert the liquid volume to gallons.
Divide the volume by the time in seconds to get gallons per second.
Multiply by 60 to convert to gallons per minute.

To convert liters per minute (LPM) to GPM, enter the volume and time in our calculator and it will convert instantly.

GPM to LPM Conversion Table

Quick reference for converting GPM to liters per minute (LPM):

1 gal/m = 3.7854 L/m	11 gal/m = 41.6395 L/m	21 gal/m = 79.4936 L/m
2 gal/m = 7.5708 L/m	12 gal/m = 45.4249 L/m	22 gal/m = 83.2791 L/m
3 gal/m = 11.3562 L/m	13 gal/m = 49.2104 L/m	23 gal/m = 87.0645 L/m
4 gal/m = 15.1416 L/m	14 gal/m = 52.9958 L/m	24 gal/m = 90.8499 L/m
5 gal/m = 18.9271 L/m	15 gal/m = 56.7812 L/m	25 gal/m = 94.6353 L/m
6 gal/m = 22.7125 L/m	16 gal/m = 60.5666 L/m	26 gal/m = 98.4207 L/m
7 gal/m = 26.4979 L/m	17 gal/m = 64.352 L/m	27 gal/m = 102.206 L/m
8 gal/m = 30.2833 L/m	18 gal/m = 68.1374 L/m	28 gal/m = 105.992 L/m
9 gal/m = 34.0687 L/m	19 gal/m = 71.9228 L/m	29 gal/m = 109.777 L/m
10 gal/m = 37.8541 L/m	20 gal/m = 75.7082 L/m	30 gal/m = 113.562 L/m
40 gal/m = 151.416 L/m	70 gal/m = 264.979 L/m	100 gal/m = 378.541 L/m
50 gal/m = 189.271 L/m	80 gal/m = 302.833 L/m	110 gal/m = 416.395 L/m
60 gal/m = 227.125 L/m	90 gal/m = 340.687 L/m	120 gal/m = 454.249 L/m
200 gal/m = 757.082 L/m	500 gal/m = 1892.71 L/m	800 gal/m = 3028.33 L/m
300 gal/m = 1135.62 L/m	600 gal/m = 2271.25 L/m	900 gal/m = 3406.87 L/m
400 gal/m = 1514.16 L/m	700 gal/m = 2649.79 L/m	1000 gal/m = 3785.41 L/m