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Volumetric Flux

m/stogfd

Convert metres per second (volumetric flux) (m/s) to US gallons per square foot per day (gfd).

Factor1 m/s = 2120516 gfd

Converter

m/s

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

Result
2.12052e+6gfd

Rendered to 6 significant figures.

Formula

Formula
gfd = m/s × 2120516

Multiply any value in metres per second (volumetric flux) by 2120516 to obtain the value in US gallons per square foot per day.

Worked example

Convert 1 m/s to gfd.

  1. 01Start with 1 m/s.
  2. 02Multiply by the conversion factor: 1 × 2120516 = 2.12052e+6 gfd.
Result1 m/s = 2.12052e+6 gfd

Conversion table

m/sgfd
12.1205e+6
24.2410e+6
51.0603e+7
102.1205e+7
204.241e+7
501.0603e+8
1002.1205e+8
2004.241e+8
5001.0603e+9
10002.1205e+9

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from m/s to gfd?
1 m/s equals 2120516 gfd. To convert, multiply the value in metres per second (volumetric flux) by 2120516.
How do I convert 1 m/s to gfd?
1 m/s = 2.12052e+6 gfd. For any value, multiply by 2120516.
How do I convert gfd back to m/s?
Divide by the same factor — or equivalently, multiply by 4.715833e-7. So 1 gfd = 4.71583e-7 m/s.
When would I need to convert metre per second (volumetric flux) to US gallon per square foot per day?
Volumetric-flux conversions between m/s 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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