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Permeability

in²tomD

Convert square inches (permeability) (in²) to millidarcy (mD).

Factor1 in² = 6.537083e+11 mD

Converter

in²

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

Result
6.53708e+11mD

Rendered to 6 significant figures.

Formula

Formula
mD = in² × 6.537083e+11

Multiply any value in square inches (permeability) by 6.537083e+11 to obtain the value in millidarcy.

Worked example

Convert 1 in² to mD.

  1. 01Start with 1 in².
  2. 02Multiply by the conversion factor: 1 × 6.537083e+11 = 6.53708e+11 mD.
Result1 in² = 6.53708e+11 mD

Conversion table

in²mD
16.5371e+11
21.3074e+12
53.2685e+12
106.5371e+12
201.3074e+13
503.2685e+13
1006.5371e+13
2001.3074e+14
5003.2685e+14
10006.5371e+14

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from in² to mD?
1 in² equals 6.537083e+11 mD. To convert, multiply the value in square inches (permeability) by 6.537083e+11.
How do I convert 1 in² to mD?
1 in² = 6.53708e+11 mD. For any value, multiply by 6.537083e+11.
How do I convert mD back to in²?
Divide by the same factor — or equivalently, multiply by 1.529734e-12. So 1 mD = 1.52973e-12 in².
When would I need to convert square inch (permeability) to millidarcy?
Permeability conversions between in² and mD 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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