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Volumetric Flow Rate

gpm (US)toIGal/hr

Convert US gallons per minute (gpm (US)) to Imperial gallons per hour (IGal/hr).

Factor1 gpm (US) = 49.96045 IGal/hr

Converter

gpm (US)

Accepts numbers or expressions, e.g. 150 + 14.7

Result
49.9605IGal/hr

Rendered to 6 significant figures.

Formula

Formula
IGal/hr = gpm (US) × 49.96045

Multiply any value in US gallons per minute by 49.96045 to obtain the value in Imperial gallons per hour.

Worked example

Convert 1 gpm (US) to IGal/hr.

  1. 01Start with 1 gpm (US).
  2. 02Multiply by the conversion factor: 1 × 49.96045 = 49.9605 IGal/hr.
Result1 gpm (US) = 49.9605 IGal/hr

Conversion table

gpm (US)IGal/hr
149.96
299.921
5249.8
10499.6
20999.21
502498
1004996
2009992.1
50024980
100049960

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gpm (US) to IGal/hr?
1 gpm (US) equals 49.96045 IGal/hr. To convert, multiply the value in US gallons per minute by 49.96045.
How do I convert 1 gpm (US) to IGal/hr?
1 gpm (US) = 49.9605 IGal/hr. For any value, multiply by 49.96045.
How do I convert IGal/hr back to gpm (US)?
Divide by the same factor — or equivalently, multiply by 0.02001583. So 1 IGal/hr = 0.0200158 gpm (US).
When would I need to convert US gallon per minute to Imperial gallon per hour?
Flow-rate conversions show up in pump curve interpretation, control valve sizing (Cv vs Kv), and aligning vendor specifications with process simulation outputs. gpm (US) to IGal/hr is a frequently needed conversion for flow datasheet preparation.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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