Convert Atomic Mass Unit to Neutron Mass
Convert atomic mass unit to neutron mass instantly. 1 atomic mass unit = 0.9914095443 neutron mass — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Neutron Mass to Atomic Mass Unit converter for the reverse conversion.
Units explained
Atomic Mass Unit
One unified atomic mass unit (u) is defined as 1/12 the mass of a carbon-12 atom, about 1.6605E-27 kg.
Introduced to give atomic and molecular masses convenient numerical values.
Atomic, molecular, and nuclear physics and chemistry.
The unified (carbon-12) scale was adopted by IUPAC and IUPAP in 1960-1961.
Neutron Mass
The neutron rest mass is about 1.6749E-27 kg, slightly more than the proton.
The mass of the neutron, the neutral nucleon.
Nuclear physics and reactor science.
Determined after James Chadwick discovered the neutron in 1932.
Atomic Mass Unit to Neutron Mass conversion formula
Note: this conversion uses a generally accepted modern value. Historical and regional definitions of this unit varied across times and places.
The relationship between atomic mass unit and neutron mass:
To convert atomic mass unit to neutron mass, multiply the value in atomic mass unit by 0.9914095443. To reverse, multiply neutron mass by 1.0086648911.
How to use this converter
Type a value into the calculator. The result in neutron mass updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Neutron Mass to Atomic Mass Unit converter for the reverse direction.
Step-by-step: convert atomic mass unit to neutron mass
- Write down the value in atomic mass unit (u).
- Multiply that value by the factor 0.9914095443.
- The product is the equivalent value in neutron mass (mn).
- To reverse, multiply the neutron mass value by 1.0086648911.
Worked examples
Example 1 — Convert 1 u to mn:
1 × 0.9914095443 = 0.9914095443 mn
Example 2 — Convert 100 u to mn:
100 × 0.9914095443 = 99.1409544264 mn
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 atomic mass unit can be re-expressed in neutron mass for direct comparison with another instrument's calibration data sheet.
800 u × 0.9914095443 = 793.1276354108 mn
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 atomic mass unit) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 u × 0.9914095443 = 1.9828190885 mn
Atomic Mass Unit to Neutron Mass conversion table
Standard reference values for converting atomic mass unit to neutron mass:
| Atomic Mass Unit [u] | Neutron Mass [mn] |
|---|---|
| 0.01 | 0.0099140954 |
| 0.1 | 0.0991409544 |
| 1 | 0.9914095443 |
| 2 | 1.9828190885 |
| 3 | 2.9742286328 |
| 4 | 3.9656381771 |
| 5 | 4.9570477213 |
| 10 | 9.9140954426 |
| 20 | 19.8281908853 |
| 30 | 29.7422863279 |
| 40 | 39.6563817705 |
| 50 | 49.5704772132 |
| 100 | 99.1409544264 |
| 500 | 495.7047721318 |
| 1000 | 991.4095442636 |
Frequently asked questions
How many neutron mass is 1 atomic mass unit?
How do I convert atomic mass unit to neutron mass?
How do I convert neutron mass back to atomic mass unit?
How many neutron mass is 100 atomic mass unit?
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Indian / South Asian (6 units)
Scientific / Atomic (8 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 u = 0.9914095443 mn) 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 Hydrographic Organization — Resolution on the Nautical Mile
International authority that standardised the nautical mile at exactly 1852 m in 1929 — the value adopted worldwide for sea and air navigation.