▸ processconvert
Volumetric Flux

LMHtogfd

Convert litres per square metre per hour (LMH) to US gallons per square foot per day (gfd).

Factor1 LMH = 0.5890322 gfd

Converter

LMH

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

Result
17.671gfd

Rendered to 6 significant figures.

Formula

Formula
gfd = LMH × 0.5890322

Multiply any value in litres per square metre per hour by 0.5890322 to obtain the value in US gallons per square foot per day.

Worked example

Convert 30 LMH to gfd.

  1. 01Start with 30 LMH.
  2. 02Multiply by the conversion factor: 30 × 0.5890322 = 17.671 gfd.
Result30 LMH = 17.671 gfd

Conversion table

LMHgfd
10.58903
21.1781
52.9452
105.8903
2011.781
5029.452
10058.903
200117.81
500294.52
1000589.03

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from LMH to gfd?
1 LMH equals 0.5890322 gfd. To convert, multiply the value in litres per square metre per hour by 0.5890322.
How do I convert 1 LMH to gfd?
1 LMH = 0.589032 gfd. For any value, multiply by 0.5890322.
How do I convert gfd back to LMH?
Divide by the same factor — or equivalently, multiply by 1.6977. So 1 gfd = 1.6977 LMH.
When would I need to convert litre per square metre per hour to US gallon per square foot per day?
Volumetric-flux conversions between LMH 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).

Related conversions