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Volumetric Flux

cm/hrtogpm/ft²

Convert centimetres per hour (volumetric flux) (cm/hr) to US gallons per minute per square foot (gpm/ft²).

Factor1 cm/hr = 0.004090502 gpm/ft²

Converter

cm/hr

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

Result
4.0905gpm/ft²

Rendered to 6 significant figures.

Formula

Formula
gpm/ft² = cm/hr × 0.004090502

Multiply any value in centimetres per hour (volumetric flux) by 0.004090502 to obtain the value in US gallons per minute per square foot.

Worked example

Convert 1000 cm/hr to gpm/ft².

  1. 01Start with 1000 cm/hr.
  2. 02Multiply by the conversion factor: 1000 × 0.004090502 = 4.0905 gpm/ft².
Result1000 cm/hr = 4.0905 gpm/ft²

Conversion table

cm/hrgpm/ft²
10.0040905
20.008181
50.020453
100.040905
200.08181
500.20453
1000.40905
2000.8181
5002.0453
10004.0905

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from cm/hr to gpm/ft²?
1 cm/hr equals 0.004090502 gpm/ft². To convert, multiply the value in centimetres per hour (volumetric flux) by 0.004090502.
How do I convert 1 cm/hr to gpm/ft²?
1 cm/hr = 0.0040905 gpm/ft². For any value, multiply by 0.004090502.
How do I convert gpm/ft² back to cm/hr?
Divide by the same factor — or equivalently, multiply by 244.4688. So 1 gpm/ft² = 244.469 cm/hr.
When would I need to convert centimetre per hour (volumetric flux) to US gallon per minute per square foot?
Volumetric-flux conversions between cm/hr and gpm/ft² are routine in membrane filtration (RO, UF, MF, NF permeate flux), hydraulic loading specification, water-treatment design, hydrometallurgy and packed-bed column loading, and environmental engineering. LMH (L/m²/h) and gfd (gal/ft²/day) dominate membrane datasheets; m³/m²/h and m³/m²/day cover SI engineering ladders; m/day and cm/s appear as superficial velocity in hydromet and packed-bed work. Volumetric flux is the same physical quantity as superficial velocity (m³/m²/s ≡ m/s) but is kept distinct from the velocity and flow categories because the engineering intent is volumetric throughput per unit area, not bulk motion or total throughput.
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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