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Permeability

m²tomm²

Convert square metres (permeability) (m²) to square millimetres (permeability) (mm²).

Factor1 m² = 1000000 mm²

Converter

m²

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

Result
1.00000e+6mm²

Rendered to 6 significant figures.

Formula

Formula
mm² = m² × 1000000

Multiply any value in square metres (permeability) by 1000000 to obtain the value in square millimetres (permeability).

Worked example

Convert 1 m² to mm².

  1. 01Start with 1 m².
  2. 02Multiply by the conversion factor: 1 × 1000000 = 1.00000e+6 mm².
Result1 m² = 1.00000e+6 mm²

Conversion table

m²mm²
11.0000e+6
22.0000e+6
55.0000e+6
101e+7
202e+7
505e+7
1001e+8
2002e+8
5005e+8
10001e+9

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from m² to mm²?
1 m² equals 1000000 mm². To convert, multiply the value in square metres (permeability) by 1000000.
How do I convert 1 m² to mm²?
1 m² = 1.00000e+6 mm². For any value, multiply by 1000000.
How do I convert mm² back to m²?
Divide by the same factor — or equivalently, multiply by 1e-6. So 1 mm² = 1e-6 m².
When would I need to convert square metre (permeability) to square millimetre (permeability)?
Permeability conversions between m² 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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