Millidarcies to Microdarcies Converter
Enter the permeability in millidarcies below to convert it to microdarcies.
Convert Millidarcies to Microdarcies
Enter a value in millidarcies (mD) to convert to microdarcies (µD).
Millidarcy to Microdarcy Conversion Table
Table showing various millidarcy measurements converted to microdarcies. Click any preset value or arrow to load it into the converter.
How to Convert Millidarcies to Microdarcies
To convert millidarcies to microdarcies, multiply the permeability by the following conversion ratio: 1,000 microdarcies/millidarcy.
Since one millidarcy is equal to 1,000 microdarcies, you can use this simple formula to convert:
The permeability in microdarcies is equal to the permeability in millidarcies multiplied by 1,000.
For example, here's how to convert 5 millidarcies to microdarcies using the formula above.
How Many Microdarcies Are in a Millidarcy?
There are 1,000 microdarcies in a millidarcy, which is why we use this value in the formula above.
Our millidarcy to microdarcy calculator automatically converts your permeability measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Millidarcies and microdarcies are both units used to measure permeability. Keep reading to learn more about each unit.
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). [1]
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.
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). [2]
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.
When converting permeability between millidarcies (mD) and microdarcies (µD), keep full floating-point precision (1 mD = 1,000 µD; 1 µD = 0.001 mD) during intermediate calculations and round only the final microdarcy figure to match your instrument tolerance.
More Millidarcy & Microdarcy Conversions
Need to calculate in the opposite direction? Use our microdarcies to millidarcies calculator to switch your starting unit immediately. You can also explore related tools such as converting microdarcies to millidarcies, converting square meters (m²) to microdarcies, or converting millidarcies to square meters (m²).
Convert from Millidarcies
Convert to Microdarcies
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Permeability Metrology Standard — Millidarcies (mD) to Microdarcies (µD)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Millidarcy (mD) & Microdarcy (µD)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (mD to µD)