Convert Darcy to Millimetre squared
Convert Darcy (D) to Millimetre squared (mm²) instantly and accurately.
Conversion Formula
mm² = D × 9.869232667e-7
About Darcy
The darcy (D) ≈ 9.869 × 10⁻¹³ m², the oilfield-standard permeability unit defined by Darcy's law: 1 D passes 1 cm³/s of 1 cP fluid through 1 cm² cross-section under a 1 atm/cm gradient. Highly permeable consolidated sandstone: 1-5 D; unconsolidated sand: 5-20 D. 1 D = 1 000 mD ≈ 0.9869 µm².
About Millimetre squared
The millimetre squared (mm²) equals 10⁻⁶ m² ≈ 1.013 × 10⁹ D, representing extremely high permeabilities beyond the range of most geological materials. It appears in geotechnical research for open rock fractures, coarse gravel channel beds, and large-cell open-foam engineered materials. 1 mm² = 10⁶ µm² = 10⁻⁶ m².
Quick Reference Table
| Darcy (D) | Millimetre squared (mm²) |
|---|---|
| 1 D | 9.869 × 10-7 mm² |
| 2 D | 1.974 × 10-6 mm² |
| 5 D | 4.935 × 10-6 mm² |
| 10 D | 9.869 × 10-6 mm² |
| 25 D | 2.467 × 10-5 mm² |
| 50 D | 4.935 × 10-5 mm² |
| 100 D | 9.869 × 10-5 mm² |