Convert Millibarn to Microbarn
Convert millibarns to microbarns instantly. 1 millibarn = 1000 microbarn — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Microbarn to Millibarn converter for the reverse conversion.
Units explained
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
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 to Microbarn conversion formula
The relationship between millibarns and microbarns:
To convert millibarns to microbarns, multiply the value in millibarns by 1000. To reverse, multiply microbarns by 0.001.
How to use this converter
Type a value into the calculator. The result in microbarns updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Microbarn to Millibarn converter for the reverse direction.
Step-by-step: convert millibarns to microbarns
- Write down the value in millibarns (mb).
- Multiply that value by the factor 1000.
- The product is the equivalent value in microbarns (µb).
- To reverse, multiply the microbarn value by 0.001.
Worked examples
Example 1 — Convert 1 mb to µb:
1 × 1000 = 1000 µb
Example 2 — Convert 100 mb to µb:
100 × 1000 = 100000 µb
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 millibarns) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 mb × 1000 = 2000 µb
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 millibarns can be re-expressed in microbarns for direct comparison with another instrument's calibration data sheet.
800 mb × 1000 = 800000.0000000001 µb
Millibarn to Microbarn conversion table
Standard reference values for converting millibarns to microbarns:
| Millibarn [mb] | Microbarn [µb] |
|---|---|
| 0.01 | 10 |
| 0.1 | 100 |
| 1 | 1000 |
| 2 | 2000 |
| 3 | 3000 |
| 4 | 4000 |
| 5 | 5000 |
| 10 | 10000 |
| 20 | 20000 |
| 30 | 30000 |
| 40 | 40000 |
| 50 | 50000 |
| 100 | 100000 |
| 500 | 500000.0000000001 |
| 1000 | 1000000.0000000001 |
Frequently asked questions
How many microbarns is 1 millibarn?
How do I convert millibarns to microbarns?
How do I convert microbarns back to millibarns?
How many microbarns is 100 millibarns?
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Imperial / US Customary (3 units)
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Sources & references
Conversion factor (1 mb = 1000 µb) 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.