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Permeability

mDtoµm²

Convert millidarcy (mD) to square micrometres (permeability) (µm²).

Factor1 mD = 0.0009869233 µm²

Converter

mD

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

Result
0.986923µm²

Rendered to 6 significant figures.

Formula

Formula
µm² = mD × 0.0009869233

Multiply any value in millidarcy by 0.0009869233 to obtain the value in square micrometres (permeability).

Worked example

Convert 1000 mD to µm².

  1. 01Start with 1000 mD.
  2. 02Multiply by the conversion factor: 1000 × 0.0009869233 = 0.986923 µm².
Result1000 mD = 0.986923 µm²

Conversion table

mDµm²
10.00098692
20.0019738
50.0049346
100.0098692
200.019738
500.049346
1000.098692
2000.19738
5000.49346
10000.98692

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mD to µm²?
1 mD equals 0.0009869233 µm². To convert, multiply the value in millidarcy by 0.0009869233.
How do I convert 1 mD to µm²?
1 mD = 0.000986923 µm². For any value, multiply by 0.0009869233.
How do I convert µm² back to mD?
Divide by the same factor — or equivalently, multiply by 1013.25. So 1 µm² = 1013.25 mD.
When would I need to convert millidarcy to square micrometre (permeability)?
Permeability conversions between mD and µm² 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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