Permeability Converter
Convert permeability between square meters, darcy, millidarcy, square centimeters, square feet, and more.
How Permeability Conversion Works
Permeability units use linear scaling — convert between units using conversion factors:
Example: 1 m² = 1e12 darcy
Actual Calculation
Why Trust This Converter?
Conversion Formula
Accuracy & Standards
Unit Relationship Diagram
Permeability Unit Comparison
| Unit | Symbol | Equals (in m²) | Used In |
|---|---|---|---|
| Square meter | m² | 1 | 🌍 Worldwide |
| Darcy | D | 9.869e-13 | 🛢️ Petroleum |
| Millidarcy | mD | 9.869e-16 | 🛢️ Petroleum |
| Square centimeter | cm² | 1e-4 | 🌍 Worldwide |
| Square foot | ft² | 0.092903 | 🇺🇸 USA |
| Permeability inch (0°C) | perm in | 2.54e-17 | 🛢️ Petroleum |
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How This Converter Works
This permeability converter uses linear scaling — converting between units using multiplication factors based on the permeability relationship.
Step 1: Convert input value using the "From" unit's factor
Step 2: Convert to the "To" unit using the target unit's factor
Real Examples
Limitations
- • This tool is for informational purposes only
- • Results should not be used for legal or certified measurements
- • Always verify critical calculations with official sources
Trust & Privacy
All calculations are performed locally in your browser. No personal information is stored or shared.
References
- BIPM SI Brochure – International System of Units
- NIST Special Publication 811 – Guide to SI Units
- ISO 80000-3 – Quantities and Units, Space and Time
References were selected from recognized standards organizations and are reviewed periodically for accuracy.
Editorial Process
The CalculatorKits editorial team reviews this tool periodically.
- Conversion formula accuracy
- Unit definitions and standards
- User guidance and clarity
- Educational content
Last reviewed: July 2026
Frequently Asked Questions
Enter a value, select the "From" and "To" units, and the result appears instantly.
We support m², darcy, mD, cm², ft², and permeability inches.
Yes, it uses standard SI conversion factors and is accurate for all supported units.
1 m² = 1e12 darcy. This is a common conversion for permeability.
Yes, your recent conversions are saved locally in your browser.
📍 Permeability Converter — For educational and informational use only
Permeability Converter: Convert Darcy, Millidarcy and m²
Permeability is an important property when studying how fluids move through porous materials.
It appears in petroleum engineering, hydrology, geology, filtration, soil studies, and material science.
The challenge is that permeability may be reported in SI units such as square meters or in industry specific units such as darcy and millidarcy.
A Permeability Converter makes those conversions much easier.
The CalculatorKits tool supports permeability units including m², darcy, millidarcy, cm², ft², and permeability inches.
Try the Permeability Converter
What Is Permeability?
Permeability describes how easily a fluid can move through a porous material when a pressure difference is applied.
It is important to distinguish permeability from porosity.
Porosity describes how much empty or pore space a material contains.
Permeability describes how easily fluid can move through connected pore spaces.
A material can have substantial porosity but relatively low permeability if its pores are poorly connected.
What Is a Permeability Converter?
A permeability converter changes a permeability value from one unit into another.
Common units include:
- m²
- Darcy
- Millidarcy
- cm²
- ft²
- Permeability inch
The CalculatorKits tool currently supports seven or more permeability units.
How to Use the Permeability Converter
1. Enter the Permeability
Type your numerical value.
2. Select the From Unit
Choose the original permeability unit.
3. Select the To Unit
Choose the target unit.
4. Convert
The result appears immediately.
5. Review the Conversion
The calculator displays the factor and calculation used.
Darcy to m²
The darcy is commonly encountered in petroleum and geological applications.
NIST notes that the darcy is a unit used for permeability of porous solids.
The CalculatorKits page gives:
1 darcy = 9.869 × 10⁻¹³ m²
Therefore:
1 m² = approximately 1.013 × 10¹² darcy
The tool uses these relationships to convert between the systems.
What Is a Millidarcy?
A millidarcy is one thousandth of a darcy.
It is commonly written:
mD
Millidarcy is particularly familiar in petroleum engineering because reservoir rocks can have permeability values much smaller than one darcy.
For example, CalculatorKits gives an illustrative oil reservoir value of 100 mD.
Permeability vs Porosity
These terms are often confused.
Porosity answers:
How much pore space is there?
Permeability answers:
How easily can fluid move through that pore structure?
High porosity does not automatically mean high permeability.
The size, shape, connectivity, and arrangement of pores can strongly influence fluid movement.
Where Is a Permeability Converter Used?
A permeability unit converter can be useful in:
Petroleum Engineering
Reservoir permeability is often reported in darcy or millidarcy.
Hydrology
Permeability and related hydraulic properties are important when studying groundwater movement.
Geology
Rock properties may be expressed using different unit systems.
Filtration
Porous materials and membranes can be evaluated in terms of fluid transport.
Material Science
Porous ceramics and other materials can have measurable permeability.
Why Use a Permeability Converter?
Permeability values can involve extremely small numbers when expressed in square meters.
For example:
1 darcy ≈ 9.869 × 10⁻¹³ m²
Working with scientific notation manually increases the chance of decimal errors.
A converter makes the scaling immediate.
CalculatorKits uses a factor based method and shows the conversion calculation on the page.
Permeability and Fluid Flow
Permeability is only one factor affecting fluid movement through porous material.
Fluid viscosity, pressure gradient, geometry, saturation, and other properties can also affect the actual flow.
This means that converting permeability units is only one part of a complete fluid flow analysis.
For flow rate conversions, you can use the Flow Converter.
Limitations
The calculator converts permeability units.
It does not measure permeability.
It also does not calculate reservoir performance, groundwater flow, or filtration efficiency.
Those applications require additional physical parameters and appropriate models.
CalculatorKits recommends independent verification for critical engineering calculations.
Frequently Asked Questions
What is permeability?
Permeability measures how easily fluid can move through a porous material.
What is the SI unit of permeability?
Permeability is expressed dimensionally in square meters, m².
What is a darcy?
Darcy is a traditional unit used to express permeability of porous materials.
What is a millidarcy?
A millidarcy is one thousandth of a darcy.
Is permeability the same as porosity?
No. Porosity describes pore volume, while permeability describes the ease of fluid movement through the material.
Can the calculator measure rock permeability?
No. It converts an existing permeability value.
Key Takeaways
- A Permeability Converter converts permeability values between different unit systems.
- Common units include m², darcy, and millidarcy.
- Darcy is widely used in petroleum and geological applications.
- Permeability is different from porosity.
- Permeability values can be extremely small when expressed in m².
- CalculatorKits supports seven or more permeability units.
- The tool converts values but does not measure physical permeability.
Reference Links
Written and reviewed by the CalculatorKits Editorial Team
Last Updated: September 9, 2026