Convert Kilogram to Atomic Mass Unit
Convert kilograms to atomic mass unit instantly. 1 kilogram = 6.022137e+26 atomic mass unit — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Atomic Mass Unit to Kilogram converter for the reverse conversion.
Units explained
Kilogram
The kilogram (kg) is the SI base unit of mass, defined by fixing the Planck constant h at 6.62607015E-34 J s.
From Greek 'khilioi' (thousand) plus 'gramma' (small weight).
The worldwide base unit of mass in science, commerce, and everyday life.
Adopted in 1795; redefined through the Planck constant on 20 May 2019.
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.
Kilogram to Atomic Mass Unit conversion formula
The relationship between kilograms and atomic mass unit:
To convert kilograms to atomic mass unit, multiply the value in kilograms by 6.022137e+26. To reverse, multiply atomic mass unit by 1.66054e-27.
How to use this converter
Type a value into the calculator. The result in atomic mass unit updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Atomic Mass Unit to Kilogram converter for the reverse direction.
Step-by-step: convert kilograms to atomic mass unit
- Write down the value in kilograms (kg).
- Multiply that value by the factor 6.022137e+26.
- The product is the equivalent value in atomic mass unit (u).
- To reverse, multiply the atomic mass unit value by 1.66054e-27.
Worked examples
Example 1 — Convert 1 kg to u:
1 × 6.022137e+26 = 6.022137e+26 u
Example 2 — Convert 100 kg to u:
100 × 6.022137e+26 = 6.022137e+28 u
Real-world example — Human-scale to atomic dimensions
One kilogram equals one billion atomic mass unit — the canonical metric conversion bridging everyday objects and atomic-scale features in physics, chemistry, and electronics.
1 kg × 6.022137e+26 = 6.022137e+26 u
Real-world example — Meter to nanoscale
One kilogram equals one billion atomic mass unit. Physics curricula use this conversion to teach orders of magnitude when introducing the electromagnetic spectrum.
1 kg × 6.022137e+26 = 6.022137e+26 u
Kilogram to Atomic Mass Unit conversion table
Standard reference values for converting kilograms to atomic mass unit:
| Kilogram [kg] | Atomic Mass Unit [u] |
|---|---|
| 0.01 | 6.022137e+24 |
| 0.1 | 6.022137e+25 |
| 1 | 6.022137e+26 |
| 2 | 1.204427e+27 |
| 3 | 1.806641e+27 |
| 4 | 2.408855e+27 |
| 5 | 3.011068e+27 |
| 10 | 6.022137e+27 |
| 20 | 1.204427e+28 |
| 30 | 1.806641e+28 |
| 40 | 2.408855e+28 |
| 50 | 3.011068e+28 |
| 100 | 6.022137e+28 |
| 500 | 3.011068e+29 |
| 1000 | 6.022137e+29 |
Frequently asked questions
How many atomic mass unit is 1 kilogram?
How do I convert kilograms to atomic mass unit?
How do I convert atomic mass unit back to kilograms?
How many atomic mass unit is 100 kilograms?
Popular weight unit conversions
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Metric / SI (17 units)
Avoirdupois (15 units)
Troy & Apothecary (10 units)
Indian / South Asian (6 units)
Scientific / Atomic (9 units)
Astronomical (4 units)
Biblical / Ancient (14 units)
Sources & references
Conversion factor (1 kg = 6.022137e+26 u) 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.