The unified atomic mass unit or dalton (symbol: u, or Da) is a standard unit of mass that quantifies mass on an atomic or molecular scale (atomic mass).
| Definition | Relation to SI units |
|---|---|
| troy pound | petagram | short hundredweight | milligram | tonne | yottagram | stone | femtogram |
|---|---|---|---|---|---|---|---|
| 1 | 3.732417216 × 10-13 | 0.0082286 | 373,241.7216 | 0.0003732 | 3.732417216 × 10-22 | 0.0587755 | 3.732417216 × 1017 |
| 2 679 228 880 719 | 1 | 22,046,226,218.488 | 1.0 × 1018 | 1 000 000 000 | 1.0 × 10-9 | 157,473,044,417.77 | 1.0 × 1030 |
| 121.5277778 | 4.5359237 × 10-11 | 1 | 45 359 237 | 0.0453592 | 4.5359237 × 10-20 | 7.1428571 | 4.5359237 × 1019 |
| 2.679228880719 × 10-6 | 1.0 × 10-18 | 2.2046226218488 × 10-8 | 1 | 1.0 × 10-9 | 1.0 × 10-27 | 1.5747304441777 × 10-7 | 1 000 000 000 000 |
| 2,679.2288807 | 1.0 × 10-9 | 22.0462262 | 1 000 000 000 | 1 | 1.0 × 10-18 | 157.4730444 | 1.0 × 1021 |
| 2.679228880719 × 1021 | 1 000 000 000 | 2.2046226218488 × 1019 | 1.0 × 1027 | 1.0 × 1018 | 1 | 1.5747304441777 × 1020 | 1.0 × 1039 |
| 17.0138889 | 6.35029318 × 10-12 | 0.14 | 6,350,293.18 | 0.0063503 | 6.35029318 × 10-21 | 1 | 6.35029318 × 1018 |
| 2.679228880719 × 10-18 | 1.0 × 10-30 | 2.2046226218488 × 10-20 | 1.0 × 10-12 | 1.0 × 10-21 | 1.0 × 10-39 | 1.5747304441777 × 10-19 | 1 |
| Symbol | Definition |
|---|---|
| ≡ | exactly equal |
| ≈ | approximately equal to |
| = | equal to |
| digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |
| 1 atomic mass unit | = 1.66053904E-27 kilograms |
| 2.5 atomic mass unit | = 4.1513476E-27 kilograms |
| 4 atomic mass unit | = 6.64215616E-27 kilograms |
| 5.5 atomic mass unit | = 9.13296472E-27 kilograms |
| 7 atomic mass unit | = 1.162377328E-26 kilograms |
| 8.5 atomic mass unit | = 1.411458184E-26 kilograms |
| 10 atomic mass unit | = 1.66053904E-26 kilograms |