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Permeability

mDtoin²

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

Factor1 mD = 1.529734e-12 in²

Converter

mD

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

Result
1.52973e-12in²

Rendered to 6 significant figures.

Formula

Formula
in² = mD × 1.529734e-12

Multiply any value in millidarcy by 1.529734e-12 to obtain the value in square inches (permeability).

Worked example

Convert 1 mD to in².

  1. 01Start with 1 mD.
  2. 02Multiply by the conversion factor: 1 × 1.529734e-12 = 1.52973e-12 in².
Result1 mD = 1.52973e-12 in²

Conversion table

mDin²
11.5297e-12
23.0595e-12
57.6487e-12
101.5297e-11
203.0595e-11
507.6487e-11
1001.5297e-10
2003.0595e-10
5007.6487e-10
10001.5297e-9

Reference values rounded to 5 significant figures for display.

FAQ

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