Microdarcies to Millidarcies Converter
Enter the permeability in microdarcies below to convert it to millidarcies.
Convert Microdarcies to Millidarcies
Enter a value in microdarcies (µD) to convert to millidarcies (mD).
Microdarcy to Millidarcy Conversion Table
Table showing various microdarcy measurements converted to millidarcies. Click any preset value or arrow to load it into the converter.
How to Convert Microdarcies to Millidarcies
To convert microdarcies to millidarcies, multiply the permeability by the following conversion ratio: 0.001 millidarcies/microdarcy.
Since one microdarcy is equal to 0.001 millidarcies, you can use this simple formula to convert:
The permeability in millidarcies is equal to the permeability in microdarcies multiplied by 0.001.
For example, here's how to convert 5 microdarcies to millidarcies using the formula above.
How Many Millidarcies Are in a Microdarcy?
There are 0.001 millidarcies in a microdarcy, which is why we use this value in the formula above.
Our microdarcy to millidarcy calculator automatically converts your permeability measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Microdarcies and millidarcies are both units used to measure permeability. Keep reading to learn more about each unit.
What Is a Microdarcy?
A microdarcy is a unit of permeability equal to 1/1,013,249,965,828,144,900 of a square meter (9.869233e-19 m²). Tight shale permeability unit (10⁻⁶ Darcy). [1]
The microdarcy is classified as a standard unit of permeability. Microdarcies can be abbreviated as µD; for example, 1 microdarcy can be written as 1 µD.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microdarcy (µD) a convenient decimal multiple of the square meter (m²).
In practice, microdarcies (µD) are widely used across fine-tolerance laboratory, analytical, and micro-scale permeability measurements within international standard workflows, engineering documentation, and technical data sheets.
What Is a Millidarcy?
A millidarcy is a unit of permeability equal to 9.869233e-16 square meters (m²), the base unit for permeability. One-thousandth of a Darcy (9.869×10⁻¹⁶ m²). [2]
The millidarcy is classified as a standard unit of permeability. Millidarcies can be abbreviated as mD; for example, 1 millidarcy can be written as 1 mD.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millidarcy (mD) a convenient decimal multiple of the square meter (m²).
In practice, millidarcies (mD) are widely used across fine-tolerance laboratory, analytical, and micro-scale permeability measurements within international standard workflows, engineering documentation, and technical data sheets.
When converting permeability between microdarcies (µD) and millidarcies (mD), keep full floating-point precision (1 µD = 0.001 mD; 1 mD = 1,000 µD) during intermediate calculations and round only the final millidarcy figure to match your instrument tolerance.
More Microdarcy & Millidarcy Conversions
Need to calculate in the opposite direction? Use our millidarcies to microdarcies calculator to switch your starting unit immediately. You can also explore related tools such as converting millidarcies to microdarcies, converting square meters (m²) to millidarcies, or converting microdarcies to square meters (m²).
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Permeability Metrology Standard — Microdarcies (µD) to Millidarcies (mD)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Microdarcy (µD) & Millidarcy (mD)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (µD to mD)