18 daltons
2.989 × 10⁻²⁶ kgMass · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Mass
Just how heavy is 18 daltons?
Particles & molecules
18 Da
2.989 × 10⁻²⁶ kgkilograms
6.5896 × 10⁻²⁶ lbpounds
2.989 × 10⁻²⁹ ttonnes
01
18 daltons2.989 × 10⁻²⁶ kgMass · definition
02
Water molecule2.992 × 10⁻²⁶ kgMass · representative
Bar length measures mass, not physical size.
A little perspective
18 daltons and Water molecule have approximately the same mass.
Measurements, assumptions & sources +
18 daltons
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Water molecule
A chosen 0.28 nm molecular-scale model. Effective molecular size depends on the definition.
University of Utah — Cell size and scale
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.
Water molecule
2.992 × 10⁻²⁶ kgMass · representative
A chosen 0.28 nm molecular-scale model. Effective molecular size depends on the definition.
- Comparing
- Mass ↔ Mass
- Relative size
- The two selected measurements are approximately equal.
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Water molecule is labelled representative; 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.