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Permeability

µm²tomm²

Convert square micrometres (permeability) (µm²) to square millimetres (permeability) (mm²).

Factor1 µm² = 1e-6 mm²

Converter

µm²

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

Result
1mm²

Rendered to 6 significant figures.

Formula

Formula
mm² = µm² × 1e-6

Multiply any value in square micrometres (permeability) by 1e-6 to obtain the value in square millimetres (permeability).

Worked example

Convert 1.00000e+6 µm² to mm².

  1. 01Start with 1.00000e+6 µm².
  2. 02Multiply by the conversion factor: 1.00000e+6 × 1e-6 = 1 mm².
Result1.00000e+6 µm² = 1 mm²

Conversion table

µm²mm²
11e-6
22e-6
55e-6
101e-5
202e-5
505e-5
1000.0001
2000.0002
5000.0005
10000.001

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from µm² to mm²?
1 µm² equals 1e-6 mm². To convert, multiply the value in square micrometres (permeability) by 1e-6.
How do I convert 1 µm² to mm²?
1 µm² = 1e-6 mm². For any value, multiply by 1e-6.
How do I convert mm² back to µm²?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 mm² = 1.00000e+6 µm².
When would I need to convert square micrometre (permeability) to square millimetre (permeability)?
Permeability conversions between µm² and mm² 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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