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Volumetric Flux

gfdtom/s

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

Factor1 gfd = 4.715833e-7 m/s

Converter

gfd

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

Result
0.471583m/s

Rendered to 6 significant figures.

Formula

Formula
m/s = gfd × 4.715833e-7

Multiply any value in US gallons per square foot per day by 4.715833e-7 to obtain the value in metres per second (volumetric flux).

Worked example

Convert 1.00000e+6 gfd to m/s.

  1. 01Start with 1.00000e+6 gfd.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 4.715833e-7 = 0.471583 m/s.
Result1.00000e+6 gfd = 0.471583 m/s

Conversion table

gfdm/s
14.7158e-7
29.4317e-7
52.3579e-6
104.7158e-6
209.4317e-6
502.3579e-5
1004.7158e-5
2009.4317e-5
5000.00023579
10000.00047158

Reference values rounded to 5 significant figures for display.

FAQ

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