Convert Darcies to Millidarcies (D to mD)
1 darcy (D) = 1000 millidarcies (mD). 1 mD = 0.001 D. Example: 15 D = 15 × 1000 = 15000 mD.
Also searched as darcies to mD, darcies in mD, darcies into millidarcies, D to mD, D in millidarcies, D into millidarcy, darcy to millidarcy, D to millidarcies converter and how many millidarcies in a darcy.
1 D = 1000 mD
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk darcy to millidarcy converter to paste a column from Excel.
How to Convert Darcy to Millidarcy
- 1 D = 1000 mD
- 1 mD = 0.001 D
- Example: convert 15 D to mD: 15 D = 15 × 1000 mD = 15000 mD
Formula
mD = D × 1000
Derivation from SI units:
- 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 = 10⁻³ D = 9.869233 × 10⁻¹⁶ m².
- 1 D = 9.869233 × 10⁻¹³ m² ÷ 9.869233 × 10⁻¹⁶ m² per mD = 1000 mD
One unit is a measured value, so the factor is approximate. Darcy definition: darcy; Millidarcy definition: millidarcy.
Worked examples
- A reading of 0.1 D converts to 100 mD.
0.1 D × 1000 = 100 mD - A value of 2 D is 2000 mD.
2 D × 1000 = 2000 mD
Darcy to Millidarcy conversion table
| Darcies (D) | Millidarcies (mD) |
|---|---|
| 0.001 D | 1 mD |
| 0.01 D | 10 mD |
| 0.05 D | 50 mD |
| 0.1 D | 100 mD |
| 0.5 D | 500 mD |
| 1 D | 1000 mD |
| 2 D | 2000 mD |
| 5 D | 5000 mD |
| 10 D | 10000 mD |
| 100 D | 100000 mD |
Where it's used
Darcies are used for oil and gas reservoir permeability, while millidarcies appear in reservoir rock classification. Both measure intrinsic permeability of a porous medium, so the conversion is a fixed factor.
Darcy to other intrinsic permeability units
| Conversion | 1 D equals |
|---|---|
| darcy to millidarcy | 1000 mD |
| darcy to square metre | 9.869233 × 10⁻¹³ m² |
| darcy to square micrometre | 0.9869233 µm² |
| darcy to square centimetre | 9.869233 × 10⁻⁹ cm² |
Frequently asked questions
How many millidarcies are in 1 darcy?
1 D = 1000 mD.
How do I convert darcies to millidarcies?
Multiply the value in D by 1000. For example, 15 D × 1000 = 15000 mD.
Is the D to mD conversion exact?
Not exactly. The darcy is a measured value (see sources). The millidarcy 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 Darcies to Millidarcies (D to mD). Retrieved October 29, 2026, from https://scientificconverters.com/intrinsic-permeability/darcies-to-millidarcies/
IEEE
Scientific Converters, "Convert Darcies to Millidarcies (D to mD)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/intrinsic-permeability/darcies-to-millidarcies/