Convert Millimetre squared to Darcy
Convert Millimetre squared (mm²) to Darcy (D) instantly and accurately.
Conversion Formula
D = mm² × 1013250
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.
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.
Quick Reference Table
| Millimetre squared (mm²) | Darcy (D) |
|---|---|
| 1 mm² | 1013250 D |
| 2 mm² | 2026500 D |
| 5 mm² | 5066250 D |
| 10 mm² | 10132500 D |
| 25 mm² | 25331300 D |
| 50 mm² | 50662500 D |
| 100 mm² | 101325000 D |