Conversion method
Intrinsic permeability describes porous media and has dimensions of area. It is not magnetic permeability or water-vapor permeance (perm). Darcy factors use the conventional atmosphere.
D = x × 1013250000000
10 m² = 1.013250e+13 D.
| m² | D |
|---|---|
| 1 | 1.013250e+12 |
| 5 | 5.066250e+12 |
| 10 | 1.013250e+13 |
| 25 | 2.533125e+13 |
| 50 | 5.066250e+13 |
| 100 | 1.013250e+14 |
Unit definitions and sources
Intrinsic permeability describes porous media and has dimensions of area. It is not magnetic permeability or water-vapor permeance (perm). Darcy factors use the conventional atmosphere.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Square meter (m²); si | Common units | Square meter: base (m2) = value × 1. Common use: Intrinsic Permeability. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Darcy (D); si | Common units | Darcy: base (m2) = value × 9.869232667160128e-13. Common use: Intrinsic Permeability. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millidarcy (mD); si | Specialist units | Millidarcy: base (m2) = value × 9.86923266716013e-16. Common use: Intrinsic Permeability. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Square micrometer (µm²); si | Specialist units | Square micrometer: base (m2) = value × 1e-12. Common use: Intrinsic Permeability. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Nanodarcy (nD); si | Specialist units | Nanodarcy: base (m2) = value × 9.869232667160127e-22. Common use: Intrinsic Permeability. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of intrinsic permeability conversions
All 5 intrinsic permeability units convert through Square meter (m²). 5 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.