How many GPM is 1 cubic meter per hour?

1 cubic meter per hour equals 4.40286754 US gallons per minute. For quick mental math, multiply m3/h by roughly 4.4 to get GPM.

How do I convert m3/hr to GPM manually?

Multiply the m3/hr value by 4.40286754. For example, 10 m3/hr × 4.40286754 = 44.029 GPM and 13.5 m3/hr × 4.40286754 = 59.439 GPM.

What is 55, 80 or 120 m3/hr in GPM?

55 m3/hr is about 242.16 US GPM, 80 m3/hr is about 352.23 US GPM and 120 m3/hr is about 528.34 US GPM, each found by multiplying by 4.40286754.

What is the exact conversion factor for m3/h to GPM?

The exact factor is 4.40286754189 GPM per m3/h, derived from 1 US gallon = 3.785411784 liters exactly, and 1 m3 = 1000 L, and 1 hour = 60 minutes.

Is m3/h to USGPM the same as m3/h to GPM?

Yes, when GPM means US gallons per minute. USGPM simply spells out the US gallon, so 1 m3/h = 4.40287 USGPM. Imperial GPM is a different unit (1 m3/h ≈ 3.666 UK GPM).

Does this use US gallons or UK imperial gallons?

This converter uses US liquid gallons. Imperial (UK) gallons are larger — 1 imperial gallon ≈ 4.546 L versus 3.785 L for a US gallon. For imperial GPM, 1 m3/h ≈ 3.666 UK GPM.

What are typical flow rates for industrial pumps in m3/h?

Small centrifugal pumps handle 1–10 m3/h (4.4–44 GPM). Mid-range HVAC pumps run 10–100 m3/h (44–440 GPM). Large industrial or municipal pumps can exceed 1,000 m3/h (4,400+ GPM).

m3/h to GPM Converter

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

To convert m3/h to GPM, multiply by 4.402868: 1 cubic meter per hour equals 4.402868 US gallons per minute, because 1,000 L ÷ 3.785411784 L per gallon ÷ 60 minutes = 4.402868.

Flow Rate Converter

Cubic meters per hour (m³/h)

= — US gallons per minute (GPM)

US gallons per minute (GPM) — reverse

= — cubic meters per hour (m³/h)

1 m³/h = 4.40286754 US GPM | 1 GPM = 0.227124707 m³/h

Common conversions

m³/h	GPM (US)

Quick answer

To convert m3/h to GPM, multiply by 4.402868: 1 cubic meter per hour equals 4.402868 US gallons per minute, because 1,000 L ÷ 3.785411784 L per gallon ÷ 60 minutes = 4.402868. To go from GPM back to m3/h, multiply by 0.227125.

Examples

m³/h	US GPM
1	4.4029
10	44.0287
13.5	59.4387
55	242.1577
80	352.2294

Type any m³/h value for instant GPM, convert back, and copy the result.

Summary

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

How it works

Enter a flow rate value in cubic meters per hour (m3/h) in the top input field.
The GPM result appears instantly as you type — no button press needed.
Use the reverse field to convert GPM back to m3/h.
Click "Copy" next to any result to copy it to your clipboard.
Click any row in the reference table to load that value into the converter.
The formula is: GPM = m3/h × 4.40286754 (based on 1 US gal = 3.785411784 L).

Use cases

Convert industrial pump flow ratings between metric and US specifications.
Size HVAC chilled-water or cooling-tower circuits when mixing metric and imperial equipment.
Verify water treatment plant throughput against GPM-stated permit limits.
Cross-check irrigation mainline flow rates between metric design specs and US GPM emitters.
Compare centrifugal pump performance curves from different international manufacturers.
Convert fire-suppression or sprinkler system flow requirements for international projects.
Calculate GPM output for boiler feedwater or process cooling systems specified in m3/h.
Convert municipal water supply flow rates for engineering reports.

Frequently Asked Questions

Last updated: 2026-09-14 · Reviewed by Nham Vu