Permeability Converter — darcy, millidarcy, m²

Convert intrinsic permeability between darcy, millidarcy, µm² and m² — used in petroleum and groundwater engineering.

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Permeability Converter

Fluids • 5 units

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How to Use the Permeability Converter

Enter a value — type any number. Invalid text and symbols are blocked automatically.
Select From and To units — choose the units to convert between.
Read the animated result — the converted value, factor, and full reference table update instantly.
Use Swap (⇄) — reverse the conversion in one click.

Why Use This Permeability Converter

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Accurate Standards

Built on internationally recognised SI and standards-body conversion factors for dependable results.

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Instant & Animated

Results update live as you type, with a clear visual breakdown across every unit at once.

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Common Permeability Converter Values

Quick reference — 1 Darcy (darcy) is equal to:

Meter²	m²	9.869233e-13
Millidarcy	mD	1,000
Micrometer²	µm²	0.9869233
Centimeter²	cm²	0.0000000099

Permeability Converter FAQ

What is a darcy? ▾

A darcy is a unit of intrinsic permeability ≈ 9.869×10⁻¹³ m². Reservoir rocks are usually rated in millidarcies (mD); 1 darcy ≈ 1,000 mD.

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✔ Reviewed by the True Value Calc editorial team🗓 Last updated June 2026📚 Sources: NIST, BIPM SI unit definitions