1 ounce
28.35 gMass · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Mass
Just how heavy is 1 ounce?
In your hand
1 oz
1 ounce
The quantity is exact as entered.
0.02835 kgMass in kilograms
0 kg
Sand dollar
A sand dollar is a flat, burrowing sea urchin with a rigid, disc-shaped skeleton, often found in sandy coastal waters.
0.025 kgDefined live mass in kilograms
0 kg
Bar length measures mass, not physical size. Both bars start at zero kilograms (kg). Pictures identify the objects only.
A little perspective
1 ounce is about 1.13 times the live mass of a sand dollar.
Measurements, assumptions & sources +
1 ounce
Mass: 28.35 g; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Sand dollar
Defined live mass: 25 g; defined specimen; range 10 g–50 g.
A defined living sand dollar with an 8 cm test diameter and 25 g mass. Species and maturity vary; short spines are included visually but do not define the rigid test span.
Smithsonian Ocean — Sea urchins and sand dollars
The marked defined live mass is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 1 ounce with the live mass of a sand dollar. The notes below explain how each value was chosen.
Sand dollar
25 gDefined live mass · defined specimen · range 10 g–50 g
A defined living sand dollar with an 8 cm test diameter and 25 g mass. Species and maturity vary; short spines are included visually but do not define the rigid test span.
- Comparing
- Mass ↔ Defined live mass
- Relative size
- 1 ounce is about 1.13 times the live mass of a sand dollar. 1 ounce is approximately 13.4% greater than the live mass of a sand dollar.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- We use 25 g for the live mass of a sand dollar; the recorded range is 10 g–50 g.
- The live mass of a sand dollar: This is an illustrative comparison value, not a claim that every example is the same.
- The recorded ranges overlap, so the ordering can vary even though the central values differ.
Mass is distinct from weight: an object’s mass stays the same as gravity changes.
0.02835 kgkilograms
0.0625 lbpounds
2.835 × 10⁻⁵ ttonnes
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