Convert Millidarcies to Square Micrometres (mD to um2)
1 millidarcy (mD) = 0.0009869233 square micrometres (µm²). 1 µm² = 1013.249966 mD. Example: 15 mD = 15 × 0.0009869233 = 0.0148038495 µm².
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1 mD = 0.0009869233 µm²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millidarcy to square micrometre converter to paste a column from Excel.
How to Convert Millidarcy to Square Micrometre
- 1 mD = 0.0009869233 µm²
- 1 µm² = 1013.249966 mD
- Example: convert 15 mD to µm²: 15 mD = 15 × 0.0009869233 µm² = 0.0148038495 µm²
Formula
µm² = mD × 0.0009869233
or µm² = mD ÷ 1013.249965828
Derivation from SI units:
- 1 mD = 10⁻³ D = 9.869233 × 10⁻¹⁶ m².
- 1 µm² = 10⁻¹² m², almost exactly one darcy (1 D = 0.9869 µm²).
- 1 mD = 9.869233 × 10⁻¹⁶ m² ÷ 1 × 10⁻¹² m² per µm² = 0.0009869233 µm²
One unit is a measured value, so the factor is approximate. Millidarcy definition: millidarcy; Square Micrometre definition: square micrometre.
Worked examples
- A reading of 1 mD converts to 0.0009869233 µm².
1 mD × 0.0009869233 = 0.0009869233 µm² - A value of 100 mD is 0.09869233 µm².
100 mD × 0.0009869233 = 0.09869233 µm²
Millidarcy to Square Micrometre conversion table
| Millidarcies (mD) | Square Micrometres (µm²) |
|---|---|
| 0.001 mD | 9.869233 × 10⁻⁷ µm² |
| 0.01 mD | 0.000009869233 µm² |
| 0.1 mD | 0.00009869233 µm² |
| 1 mD | 0.0009869233 µm² |
| 10 mD | 0.009869233 µm² |
| 50 mD | 0.049346165 µm² |
| 100 mD | 0.09869233 µm² |
| 250 mD | 0.246730825 µm² |
| 500 mD | 0.49346165 µm² |
| 1000 mD | 0.9869233 µm² |
Where it's used
Millidarcies are used for reservoir rock classification, while square micrometres appear in petroleum reservoir data in SI. 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 square micrometre | 0.0009869233 µm² |
| millidarcy to square metre | 9.869233 × 10⁻¹⁶ m² |
| millidarcy to darcy | 0.001 D |
| millidarcy to square centimetre | 9.869233 × 10⁻¹² cm² |
Frequently asked questions
How many square micrometres are in 1 millidarcy?
1 mD = 0.0009869233 µm².
How do I convert millidarcies to square micrometres?
Multiply the value in mD by 0.0009869233, or divide it by 1013.249966. For example, 15 mD × 0.0009869233 = 0.0148038495 µm².
Is the mD to µm² conversion exact?
Not exactly. 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".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (derived units) and Table 8 (non-SI units accepted for use with the SI).
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 Square Micrometres (mD to um2). Retrieved October 29, 2026, from https://scientificconverters.com/intrinsic-permeability/millidarcies-to-square-micrometers/
IEEE
Scientific Converters, "Convert Millidarcies to Square Micrometres (mD to um2)," scientificconverters.com. Accessed: Oct. 29, 2026. [Online]. Available: https://scientificconverters.com/intrinsic-permeability/millidarcies-to-square-micrometers/