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Permeability

µm²toD

Convert square micrometres (permeability) (µm²) to darcy (D).

Factor1 µm² = 1.01325 D

Converter

µm²

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

Result
1.01325D

Rendered to 6 significant figures.

Formula

Formula
D = µm² × 1.01325

Multiply any value in square micrometres (permeability) by 1.01325 to obtain the value in darcy.

Worked example

Convert 1 µm² to D.

  1. 01Start with 1 µm².
  2. 02Multiply by the conversion factor: 1 × 1.01325 = 1.01325 D.
Result1 µm² = 1.01325 D

Conversion table

µm²D
11.0132
22.0265
55.0662
1010.132
2020.265
5050.662
100101.32
200202.65
500506.62
10001013.2

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from µm² to D?
1 µm² equals 1.01325 D. To convert, multiply the value in square micrometres (permeability) by 1.01325.
How do I convert 1 µm² to D?
1 µm² = 1.01325 D. For any value, multiply by 1.01325.
How do I convert D back to µm²?
Divide by the same factor — or equivalently, multiply by 0.9869233. So 1 D = 0.986923 µm².
When would I need to convert square micrometre (permeability) to darcy?
Permeability conversions between µm² and D 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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