1 dalton
1.661 × 10⁻²⁷ kgMass · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Mass
Just how heavy is 1 dalton?
Particles & molecules
1 Da
1.6605 × 10⁻²⁷ kgkilograms
3.6609 × 10⁻²⁷ lbpounds
1.6605 × 10⁻³⁰ ttonnes
01
1 dalton1.661 × 10⁻²⁷ kgMass · definition
02
Proton1.673 × 10⁻²⁷ kgMass · measured constant
Bar length measures mass, not physical size.
A little perspective
Proton has about 1.01 times the mass of 1 dalton.
Measurements, assumptions & sources +
1 dalton
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Proton
Twice the approximately 0.8409 fm charge radius. The charge distribution has no hard boundary; the illustration is schematic.
NIST — 2022 CODATA fundamental constants
The marked mass is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
The visual compares mass with mass. The records below preserve each value’s basis and caveats.
Proton
1.673 × 10⁻²⁷ kgMass · measured constant
Twice the approximately 0.8409 fm charge radius. The charge distribution has no hard boundary; the illustration is schematic.
- Comparing
- Mass ↔ Mass
- Relative size
- Proton is larger on this measurement by a factor of about 1.01. Proton's selected measurement is approximately 0.728% greater than 1 dalton's.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Proton is labelled measured constant; treat the displayed value as a comparison anchor rather than false precision.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
A little smaller. A little larger.