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Permeability

mDtoft²

Convert millidarcy (mD) to square feet (permeability) (ft²).

Factor1 mD = 1.062315e-14 ft²

Converter

mD

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

Result
1.06232e-14ft²

Rendered to 6 significant figures.

Formula

Formula
ft² = mD × 1.062315e-14

Multiply any value in millidarcy by 1.062315e-14 to obtain the value in square feet (permeability).

Worked example

Convert 1 mD to ft².

  1. 01Start with 1 mD.
  2. 02Multiply by the conversion factor: 1 × 1.062315e-14 = 1.06232e-14 ft².
Result1 mD = 1.06232e-14 ft²

Conversion table

mDft²
11.0623e-14
22.1246e-14
55.3116e-14
101.0623e-13
202.1246e-13
505.3116e-13
1001.0623e-12
2002.1246e-12
5005.3116e-12
10001.0623e-11

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mD to ft²?
1 mD equals 1.062315e-14 ft². To convert, multiply the value in millidarcy by 1.062315e-14.
How do I convert 1 mD to ft²?
1 mD = 1.06232e-14 ft². For any value, multiply by 1.062315e-14.
How do I convert ft² back to mD?
Divide by the same factor — or equivalently, multiply by 9.4134e+13. So 1 ft² = 9.4134e+13 mD.
When would I need to convert millidarcy to square foot (permeability)?
Permeability conversions between mD and ft² appear in petroleum and reservoir engineering, hydrogeology, geotechnical engineering, packed-bed filtration and porous-materials research. The darcy (D) and its sub-multiples (mD, µD, nD) dominate petroleum-engineering documentation; SI area-equivalent units (m², µm², mm², cm², ft²) appear in geophysics and porous-media research. Intrinsic permeability is a property of the porous medium alone — this category does NOT include hydraulic conductivity (m/s, requires fluid density and viscosity), gas permeability (Klinkenberg slip corrections) or membrane-permeability coefficients, all of which are different physical quantities and require explicit assumptions.
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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