Atomic Mass Unit to Kilogram Converter
Convert Atomic Mass Unit (u) to Kilogram (kg) instantly. 1 u = 1.660539e-27 kg.
Mass Converter
26 units available
1 u = 1.660539e-27 kg
Formula:
kg = u × 1.660539e-27With your value: 1 u = 1.660539e-27 kg
How big is that?
Everyday references on a logarithmic scale, all expressed in atomic mass unit so you can sanity-check the result.
Other Atomic Mass Unit to Kilogram conversions
Atomic Mass Unit to Kilogram Conversion Table
| Atomic Mass Unit (u) | Kilogram (kg) |
|---|---|
| 0.5 | 8.302695e-28 |
| 1 | 1.660539e-27 |
| 2 | 3.321078e-27 |
| 5 | 8.302695e-27 |
| 10 | 1.660539e-26 |
| 15 | 2.490809e-26 |
| 20 | 3.321078e-26 |
| 25 | 4.151348e-26 |
| 50 | 8.302695e-26 |
| 100 | 1.660539e-25 |
| 250 | 4.151348e-25 |
| 500 | 8.302695e-25 |
| 1000 | 1.660539e-24 |
Kilogram to Atomic Mass Unit Conversion Table
| Kilogram (kg) | Atomic Mass Unit (u) |
|---|---|
| 0.5 | 3.011070e+26 |
| 1 | 6.022141e+26 |
| 2 | 1.204428e+27 |
| 5 | 3.011070e+27 |
| 10 | 6.022141e+27 |
| 15 | 9.033211e+27 |
| 20 | 1.204428e+28 |
| 25 | 1.505535e+28 |
| 50 | 3.011070e+28 |
| 100 | 6.022141e+28 |
| 250 | 1.505535e+29 |
| 500 | 3.011070e+29 |
| 1000 | 6.022141e+29 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Atomic Mass Unit (u)
Mass
The unified atomic mass unit is 1/12 the mass of a free carbon-12 atom: 1.660 539 068 92(52) × 10⁻²⁷ kg.
Experimentally determined; the last digits carry the CODATA 2022 uncertainty.
Source: CODATA Internationally Recommended Values of the Fundamental Physical Constants (2022 adjustment)
CODATA / NIST · Reviewed 2026-07-01
Kilogram (kg)
Mass
The kilogram is defined by taking the Planck constant to be exactly 6.626 070 15 × 10⁻³⁴ J·s.
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Atomic Mass Unit to Kilogram
To convert from Atomic Mass Unit (u) to Kilogram (kg), multiply the value by 1.660539e-27.
Formula: kg = u × 1.660539e-27
Reverse: u = kg × 6.022141e+26
Step-by-Step Example
- Start with your value in Atomic Mass Unit. For example: 5 u
- Multiply by the conversion factor: 5 x 1.660539e-27
- The result is: 8.302695e-27 kg
About Atomic Mass Unit
The unified atomic mass unit (dalton) is 1/12 the mass of a carbon-12 atom, about 1.66054×10⁻²⁷ kg.
Common uses: chemistry, mass spectrometry, molecular biology.
About Kilogram
The kilogram is the base unit of mass in the SI system. Since 2019, it is defined by the Planck constant rather than a physical artifact.
Fun Fact: Until 2019, the kilogram was defined by a platinum-iridium cylinder kept in Paris, called "Le Grand K."
Common uses: body weight, cooking, shipping.
Frequently Asked Questions
How many Kilogram are in 1 Atomic Mass Unit?
There are exactly 1.660539e-27 Kilogram in 1 Atomic Mass Unit. This means the conversion factor from Atomic Mass Unit to Kilogram is 1.660539e-27.
What is the formula to convert Atomic Mass Unit to Kilogram?
The formula to convert Atomic Mass Unit to Kilogram is: kg = u × 1.660539e-27. For example, to convert 10 Atomic Mass Unit to Kilogram, you would multiply 10 by 1.660539e-27.
What is a Atomic Mass Unit?
The unified atomic mass unit (dalton) is 1/12 the mass of a carbon-12 atom, about 1.66054×10⁻²⁷ kg.
What is a Kilogram?
The kilogram is the base unit of mass in the SI system. Since 2019, it is defined by the Planck constant rather than a physical artifact.
What are the common uses of Atomic Mass Unit?
The Atomic Mass Unit is commonly used in chemistry, mass spectrometry, molecular biology.
Related Mass Conversions
Cite this page
UnitConvertLab. (2026). Atomic Mass Unit to Kilogram converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/atomic_mass_unit-to-kilogram