Convert Millidarcies to Darcies (mD to D)
1 millidarcy (mD) = 0.001 darcies (D). 1 D = 1000 mD. Example: 15 mD = 15 × 0.001 = 0.015 D.
Also searched as millidarcies to D, millidarcies in D, millidarcies into darcies, mD to D, mD in darcies, mD into darcy, millidarcy to darcy, mD to darcies converter and how many darcies in a millidarcy.
1 mD = 0.001 D
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millidarcy to darcy converter to paste a column from Excel.
How to Convert Millidarcy to Darcy
- 1 mD = 0.001 D
- 1 D = 1000 mD
- Example: convert 15 mD to D: 15 mD = 15 × 0.001 D = 0.015 D
Formula
D = mD ÷ 1000
Derivation from SI units:
- 1 mD = 10⁻³ D = 9.869233 × 10⁻¹⁶ m².
- 1 D passes 1 cm³/s of a 1 cP fluid through 1 cm² under 1 atm/cm: 9.869233 × 10⁻¹³ m².
- 1 mD = 9.869233 × 10⁻¹⁶ m² ÷ 9.869233 × 10⁻¹³ m² per D = 0.001 D
One unit is a measured value, so the factor is approximate. Millidarcy definition: millidarcy; Darcy definition: darcy.
Worked examples
- A reading of 1 mD converts to 0.001 D.
1 mD × 0.001 = 0.001 D - A value of 100 mD is 0.1 D.
100 mD × 0.001 = 0.1 D
Millidarcy to Darcy conversion table
| Millidarcies (mD) | Darcies (D) |
|---|---|
| 0.001 mD | 0.000001 D |
| 0.01 mD | 0.00001 D |
| 0.1 mD | 0.0001 D |
| 1 mD | 0.001 D |
| 10 mD | 0.01 D |
| 50 mD | 0.05 D |
| 100 mD | 0.1 D |
| 250 mD | 0.25 D |
| 500 mD | 0.5 D |
| 1000 mD | 1 D |
Where it's used
Millidarcies are used for reservoir rock classification, while darcies appear in oil and gas reservoir permeability. Both measure intrinsic permeability of a porous medium, so the conversion is a fixed factor.
Millidarcy to other intrinsic permeability units
| Conversion | 1 mD equals |
|---|---|
| millidarcy to darcy | 0.001 D |
| millidarcy to square metre | 9.869233 × 10⁻¹⁶ m² |
| millidarcy to square micrometre | 0.0009869233 µm² |
| millidarcy to square centimetre | 9.869233 × 10⁻¹² cm² |
Frequently asked questions
How many darcies are in 1 millidarcy?
1 mD = 0.001 D.
How do I convert millidarcies to darcies?
Multiply the value in mD by 0.001, or divide it by 1000. For example, 15 mD × 0.001 = 0.015 D.
Is the mD to D conversion exact?
Not exactly. The millidarcy is a measured value (see sources). The darcy is a measured value (see sources). Results are good to about 5 significant figures.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "darcy".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Millidarcies to Darcies (mD to D). Retrieved October 29, 2026, from https://scientificconverters.com/intrinsic-permeability/millidarcies-to-darcies/
IEEE
Scientific Converters, "Convert Millidarcies to Darcies (mD to D)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/intrinsic-permeability/millidarcies-to-darcies/