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Volumetric Flux

gfdtom³/m²/s

Convert US gallons per square foot per day (gfd) to cubic metres per square metre per second (m³/m²/s).

Factor1 gfd = 4.715833e-7 m³/m²/s

Converter

gfd

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

Result
0.471583m³/m²/s

Rendered to 6 significant figures.

Formula

Formula
m³/m²/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 cubic metres per square metre per second.

Worked example

Convert 1.00000e+6 gfd to m³/m²/s.

  1. 01Start with 1.00000e+6 gfd.
  2. 02Multiply by the conversion factor: 1.00000e+6 × 4.715833e-7 = 0.471583 m³/m²/s.
Result1.00000e+6 gfd = 0.471583 m³/m²/s

Conversion table

gfdm³/m²/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 m³/m²/s?
1 gfd equals 4.715833e-7 m³/m²/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 m³/m²/s?
1 gfd = 4.71583e-7 m³/m²/s. For any value, multiply by 4.715833e-7.
How do I convert m³/m²/s back to gfd?
Divide by the same factor — or equivalently, multiply by 2120516. So 1 m³/m²/s = 2.12052e+6 gfd.
When would I need to convert US gallon per square foot per day to cubic metre per square metre per second?
Volumetric-flux conversions between gfd and m³/m²/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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