How many cubic meters per hour is 1 GPM?

1 US gallon per minute equals 0.227124707 cubic meters per hour (m³/h). This comes from multiplying the gallon-to-cubic-meter factor (0.00378541 m³/gal) by 60 minutes.

How many GPM is 1 m³/h?

1 cubic meter per hour equals approximately 4.40287 US gallons per minute. This is the inverse of the forward conversion factor.

Does this convert UK gallons or US gallons?

This tool uses US gallons. 1 US gallon = 3.78541 liters. If you need UK (imperial) gallons, multiply your GPM by 1.20095 first to convert to US gallons, then use this converter.

What is the exact conversion formula?

GPM × 0.227124707 = m³/h. In full: 1 US gal = 0.00378541 m³, and 1 minute = 1/60 hour, so 1 GPM = 0.00378541 × 60 = 0.227124707 m³/h.

When would I use GPM vs m³/h?

GPM is standard in North American plumbing, fire protection, and HVAC. Cubic meters per hour is the metric standard used in Europe, Asia, and international engineering documents. Converting between them is common when sourcing equipment globally.

GPM to m3/h Converter

Name: GPM to m3/h Converter
Availability: InStock
Author: Nham Vu

Enter US gallons per minute (GPM) to get the equivalent flow rate in cubic meters per hour (m³/h), with reverse conversion and a reference table.

Convert Flow Rate

Gallons Per Minute (GPM)

converts both ways

Cubic Meters Per Hour (m³/h)

Common Values

GPM	m³/h

Conversion factor

1 GPM = 0.227124707 m³/h

1 m³/h = 4.40287 GPM

Summary

Enter US gallons per minute (GPM) to get the equivalent flow rate in cubic meters per hour (m³/h), with reverse conversion and a reference table.

How it works

Enter a flow rate in US gallons per minute (GPM) in the top field.
The cubic meters per hour result appears instantly.
Use the reverse field to convert m³/h back to GPM.
The formula section shows the exact calculation.
Click "Copy" next to any result to copy it to your clipboard.
Click any row in the reference table to load that value.

Use cases

Size pumps and select equipment across imperial and metric datasheets.
Convert HVAC chilled-water or condenser-water flow rates for international projects.
Verify irrigation system flow rates for metric-based design standards.
Translate municipal water supply figures between US and metric specs.
Cross-check industrial process flow rates on equipment from different regions.
Compare pump curves listed in different unit systems.

Frequently Asked Questions

Last updated: 2026-07-23 · Reviewed by Nham Vu