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Volumetric Flux

gpm/ft²togfd

Convert US gallons per minute per square foot (gpm/ft²) to US gallons per square foot per day (gfd).

Factor1 gpm/ft² = 1440 gfd

Converter

gpm/ft²

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

Result
1440gfd

Rendered to 6 significant figures.

Formula

Formula
gfd = gpm/ft² × 1440

Multiply any value in US gallons per minute per square foot by 1440 to obtain the value in US gallons per square foot per day.

Worked example

Convert 1 gpm/ft² to gfd.

  1. 01Start with 1 gpm/ft².
  2. 02Multiply by the conversion factor: 1 × 1440 = 1440 gfd.
Result1 gpm/ft² = 1440 gfd

Conversion table

gpm/ft²gfd
11440
22880
57200
1014400
2028800
5072000
1001.4400e+5
2002.8800e+5
5007.2000e+5
10001.4400e+6

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gpm/ft² to gfd?
1 gpm/ft² equals 1440 gfd. To convert, multiply the value in US gallons per minute per square foot by 1440.
How do I convert 1 gpm/ft² to gfd?
1 gpm/ft² = 1440 gfd. For any value, multiply by 1440.
How do I convert gfd back to gpm/ft²?
Divide by the same factor — or equivalently, multiply by 0.0006944444. So 1 gfd = 0.000694444 gpm/ft².
When would I need to convert US gallon per minute per square foot to US gallon per square foot per day?
Volumetric-flux conversions between gpm/ft² and gfd 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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