▸ processconvert
Volumetric Flux

gpm/ft²toLMH

Convert US gallons per minute per square foot (gpm/ft²) to litres per square metre per hour (LMH).

Factor1 gpm/ft² = 2444.688 LMH

Converter

gpm/ft²

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

Result
2444.69LMH

Rendered to 6 significant figures.

Formula

Formula
LMH = gpm/ft² × 2444.688

Multiply any value in US gallons per minute per square foot by 2444.688 to obtain the value in litres per square metre per hour.

Worked example

Convert 1 gpm/ft² to LMH.

  1. 01Start with 1 gpm/ft².
  2. 02Multiply by the conversion factor: 1 × 2444.688 = 2444.69 LMH.
Result1 gpm/ft² = 2444.69 LMH

Conversion table

gpm/ft²LMH
12444.7
24889.4
512223
1024447
2048894
501.2223e+5
1002.4447e+5
2004.8894e+5
5001.2223e+6
10002.4447e+6

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from gpm/ft² to LMH?
1 gpm/ft² equals 2444.688 LMH. To convert, multiply the value in US gallons per minute per square foot by 2444.688.
How do I convert 1 gpm/ft² to LMH?
1 gpm/ft² = 2444.69 LMH. For any value, multiply by 2444.688.
How do I convert LMH back to gpm/ft²?
Divide by the same factor — or equivalently, multiply by 0.0004090502. So 1 LMH = 0.00040905 gpm/ft².
When would I need to convert US gallon per minute per square foot to litre per square metre per hour?
Volumetric-flux conversions between gpm/ft² and LMH 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