Permeability
in²toD
Convert square inches (permeability) (in²) to darcy (D).
Factor1 in² = 6.537083e+8 D
Converter
in²
Accepts numbers or expressions, e.g. 150 + 14.7
Result
D
Rendered to 6 significant figures.
Formula
Formula
D = in² × 6.537083e+8
Multiply any value in square inches (permeability) by 6.537083e+8 to obtain the value in darcy.
Worked example
Convert 1 in² to D.
- 01Start with 1 in².
- 02Multiply by the conversion factor: 1 × 6.537083e+8 = 6.53708e+8 D.
Result1 in² = 6.53708e+8 D
Conversion table
| in² | D |
|---|---|
| 1 | 6.5371e+8 |
| 2 | 1.3074e+9 |
| 5 | 3.2685e+9 |
| 10 | 6.5371e+9 |
| 20 | 1.3074e+10 |
| 50 | 3.2685e+10 |
| 100 | 6.5371e+10 |
| 200 | 1.3074e+11 |
| 500 | 3.2685e+11 |
| 1000 | 6.5371e+11 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from in² to D?
1 in² equals 6.537083e+8 D. To convert, multiply the value in square inches (permeability) by 6.537083e+8.
How do I convert 1 in² to D?
1 in² = 6.53708e+8 D. For any value, multiply by 6.537083e+8.
How do I convert D back to in²?
Divide by the same factor — or equivalently, multiply by 1.529734e-9. So 1 D = 1.52973e-9 in².
When would I need to convert square inch (permeability) to darcy?
Permeability conversions between in² and D appear in petroleum and reservoir engineering, hydrogeology, geotechnical engineering, packed-bed filtration and porous-materials research. The darcy (D) and its sub-multiples (mD, µD, nD) dominate petroleum-engineering documentation; SI area-equivalent units (m², µm², mm², cm², ft²) appear in geophysics and porous-media research. Intrinsic permeability is a property of the porous medium alone — this category does NOT include hydraulic conductivity (m/s, requires fluid density and viscosity), gas permeability (Klinkenberg slip corrections) or membrane-permeability coefficients, all of which are different physical quantities and require explicit assumptions.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).