▸ processconvert
Permeability

nDtomm²

Convert nanodarcy (nD) to square millimetres (permeability) (mm²).

Factor1 nD = 9.869233e-16 mm²

Converter

nD

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

Result
9.86923e-16mm²

Rendered to 6 significant figures.

Formula

Formula
mm² = nD × 9.869233e-16

Multiply any value in nanodarcy by 9.869233e-16 to obtain the value in square millimetres (permeability).

Worked example

Convert 1 nD to mm².

  1. 01Start with 1 nD.
  2. 02Multiply by the conversion factor: 1 × 9.869233e-16 = 9.86923e-16 mm².
Result1 nD = 9.86923e-16 mm²

Conversion table

nDmm²
19.8692e-16
21.9738e-15
54.9346e-15
109.8692e-15
201.9738e-14
504.9346e-14
1009.8692e-14
2001.9738e-13
5004.9346e-13
10009.8692e-13

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from nD to mm²?
1 nD equals 9.869233e-16 mm². To convert, multiply the value in nanodarcy by 9.869233e-16.
How do I convert 1 nD to mm²?
1 nD = 9.86923e-16 mm². For any value, multiply by 9.869233e-16.
How do I convert mm² back to nD?
Divide by the same factor — or equivalently, multiply by 1.01325e+15. So 1 mm² = 1.01325e+15 nD.
When would I need to convert nanodarcy to square millimetre (permeability)?
Permeability conversions between nD 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).

Related conversions