Permeability
µDtomD
Convert microdarcy (µD) to millidarcy (mD).
Factor1 µD = 0.001 mD
Converter
µD
Accepts numbers or expressions, e.g. 150 + 14.7
Result
mD
Rendered to 6 significant figures.
Formula
Formula
mD = µD × 0.001
Multiply any value in microdarcy by 0.001 to obtain the value in millidarcy.
Worked example
Convert 1000 µD to mD.
- 01Start with 1000 µD.
- 02Multiply by the conversion factor: 1000 × 0.001 = 1 mD.
Result1000 µD = 1 mD
Conversion table
| µD | mD |
|---|---|
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 50 | 0.05 |
| 100 | 0.1 |
| 200 | 0.2 |
| 500 | 0.5 |
| 1000 | 1 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from µD to mD?
1 µD equals 0.001 mD. To convert, multiply the value in microdarcy by 0.001.
How do I convert 1 µD to mD?
1 µD = 0.001 mD. For any value, multiply by 0.001.
How do I convert mD back to µD?
Divide by the same factor — or equivalently, multiply by 1000. So 1 mD = 1000 µD.
When would I need to convert microdarcy to millidarcy?
Permeability conversions between µD and mD 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).