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Permeability

mm²toµD

Convert square millimetres (permeability) (mm²) to microdarcy (µD).

Factor1 mm² = 1.01325e+12 µD

Converter

mm²

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

Result
1.01325e+12µD

Rendered to 6 significant figures.

Formula

Formula
µD = mm² × 1.01325e+12

Multiply any value in square millimetres (permeability) by 1.01325e+12 to obtain the value in microdarcy.

Worked example

Convert 1 mm² to µD.

  1. 01Start with 1 mm².
  2. 02Multiply by the conversion factor: 1 × 1.01325e+12 = 1.01325e+12 µD.
Result1 mm² = 1.01325e+12 µD

Conversion table

mm²µD
11.0132e+12
22.0265e+12
55.0662e+12
101.0132e+13
202.0265e+13
505.0662e+13
1001.0132e+14
2002.0265e+14
5005.0662e+14
10001.0132e+15

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mm² to µD?
1 mm² equals 1.01325e+12 µD. To convert, multiply the value in square millimetres (permeability) by 1.01325e+12.
How do I convert 1 mm² to µD?
1 mm² = 1.01325e+12 µD. For any value, multiply by 1.01325e+12.
How do I convert µD back to mm²?
Divide by the same factor — or equivalently, multiply by 9.869233e-13. So 1 µD = 9.86923e-13 mm².
When would I need to convert square millimetre (permeability) to microdarcy?
Permeability conversions between mm² and µD 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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