Convert Microbarn to Millibarn
Convert microbarns to millibarns instantly. 1 microbarn = 0.001 millibarn — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Millibarn to Microbarn converter for the reverse conversion.
Units explained
Microbarn
A microbarn is a scientific unit of area equal to exactly 10⁻³⁴ m² (10⁻⁶ barn).
Derived from the barn using the standard SI micro- prefix. Identical in value to the humor unit 'outhouse'.
Microbarns appear in particle physics for moderately rare process cross-sections. They are widely used in heavy-ion physics and electroweak cross-section measurements.
Standard derivative of the barn unit.
Millibarn
A millibarn is a scientific unit of area equal to exactly 10⁻³¹ m² (1/1000 of a barn).
Derived from the barn using the standard SI milli- prefix.
Millibarns are widely used in particle physics for medium-strength interaction cross-sections. The total proton-proton inelastic cross-section is on the order of 70 mb at LHC energies.
Standard derivative of the barn unit.
Microbarn to Millibarn conversion formula
The relationship between microbarns and millibarns:
To convert microbarns to millibarns, multiply the value in microbarns by 0.001. To reverse, multiply millibarns by 1000.
How to use this converter
Type a value into the calculator. The result in millibarns updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Millibarn to Microbarn converter for the reverse direction.
Step-by-step: convert microbarns to millibarns
- Write down the value in microbarns (µb).
- Multiply that value by the factor 0.001.
- The product is the equivalent value in millibarns (mb).
- To reverse, multiply the millibarn value by 1000.
Worked examples
Example 1 — Convert 1 µb to mb:
1 × 0.001 = 0.001 mb
Example 2 — Convert 100 µb to mb:
100 × 0.001 = 0.1 mb
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 microbarns) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 µb × 0.001 = 0.002 mb
Real-world example — Wavelengths across the spectrum
Optical and atomic-scale phenomena are routinely cross-converted between sub-micron units. A photon of wavelength 800 microbarns can be re-expressed in millibarns for direct comparison with another instrument's calibration data sheet.
800 µb × 0.001 = 0.8 mb
Microbarn to Millibarn conversion table
Standard reference values for converting microbarns to millibarns:
| Microbarn [µb] | Millibarn [mb] |
|---|---|
| 0.01 | 1e-5 |
| 0.1 | 1e-4 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 100 | 0.1 |
| 500 | 0.5 |
| 1000 | 1 |
Frequently asked questions
How many millibarns is 1 microbarn?
How do I convert microbarns to millibarns?
How do I convert millibarns back to microbarns?
How many millibarns is 100 microbarns?
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Sources & references
Conversion factor (1 µb = 0.001 mb) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.