Volumetric Flux
gfdtom³/m²/day
Convert US gallons per square foot per day (gfd) to cubic metres per square metre per day (m³/m²/day).
Factor1 gfd = 0.0407448 m³/m²/day
Converter
gfd
Accepts numbers or expressions, e.g. 150 + 14.7
Result
m³/m²/day
Rendered to 6 significant figures.
Formula
Formula
m³/m²/day = gfd × 0.0407448
Multiply any value in US gallons per square foot per day by 0.0407448 to obtain the value in cubic metres per square metre per day.
Worked example
Convert 100 gfd to m³/m²/day.
- 01Start with 100 gfd.
- 02Multiply by the conversion factor: 100 × 0.0407448 = 4.07448 m³/m²/day.
Result100 gfd = 4.07448 m³/m²/day
Conversion table
| gfd | m³/m²/day |
|---|---|
| 1 | 0.040745 |
| 2 | 0.08149 |
| 5 | 0.20372 |
| 10 | 0.40745 |
| 20 | 0.8149 |
| 50 | 2.0372 |
| 100 | 4.0745 |
| 200 | 8.149 |
| 500 | 20.372 |
| 1000 | 40.745 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from gfd to m³/m²/day?
1 gfd equals 0.0407448 m³/m²/day. To convert, multiply the value in US gallons per square foot per day by 0.0407448.
How do I convert 1 gfd to m³/m²/day?
1 gfd = 0.0407448 m³/m²/day. For any value, multiply by 0.0407448.
How do I convert m³/m²/day back to gfd?
Divide by the same factor — or equivalently, multiply by 24.54301. So 1 m³/m²/day = 24.543 gfd.
When would I need to convert US gallon per square foot per day to cubic metre per square metre per day?
Volumetric-flux conversions between gfd and m³/m²/day 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).
Related conversions
- m³/m²/day → gfdcubic metre per square metre per day → US gallon per square foot per day
- m/s → m³/m²/daymetre per second (volumetric flux) → cubic metre per square metre per day
- m³/m²/day → m/scubic metre per square metre per day → metre per second (volumetric flux)
- m/s → gfdmetre per second (volumetric flux) → US gallon per square foot per day
- gfd → m/sUS gallon per square foot per day → metre per second (volumetric flux)
- m³/m²/s → m³/m²/daycubic metre per square metre per second → cubic metre per square metre per day