▸ processconvert
Permeability

mm²tokD

Convert square millimetres (permeability) (mm²) to kilodarcy (kD).

Factor1 mm² = 1013.25 kD

Converter

mm²

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

Result
1013.25kD

Rendered to 6 significant figures.

Formula

Formula
kD = mm² × 1013.25

Multiply any value in square millimetres (permeability) by 1013.25 to obtain the value in kilodarcy.

Worked example

Convert 1 mm² to kD.

  1. 01Start with 1 mm².
  2. 02Multiply by the conversion factor: 1 × 1013.25 = 1013.25 kD.
Result1 mm² = 1013.25 kD

Conversion table

mm²kD
11013.2
22026.5
55066.2
1010132
2020265
5050662
1001.0132e+5
2002.0265e+5
5005.0662e+5
10001.0132e+6

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from mm² to kD?
1 mm² equals 1013.25 kD. To convert, multiply the value in square millimetres (permeability) by 1013.25.
How do I convert 1 mm² to kD?
1 mm² = 1013.25 kD. For any value, multiply by 1013.25.
How do I convert kD back to mm²?
Divide by the same factor — or equivalently, multiply by 0.0009869233. So 1 kD = 0.000986923 mm².
When would I need to convert square millimetre (permeability) to kilodarcy?
Permeability conversions between mm² and kD 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