Bottle cap
2.8 cm - Diameter; example.
A bottle cap is a small closure used to seal the opening of a bottle and keep its contents secure.
A defined 28 mm diameter cap.
Defined examples — our methodologyThe diameter of a bottle cap is about 1.15 times the diameter of a US quarter. Selected basis: an example for Bottle cap; approximate values.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
2.8 cm - Diameter; example.
A bottle cap is a small closure used to seal the opening of a bottle and keep its contents secure.
A defined 28 mm diameter cap.
Defined examples — our methodology2.426 cm - Diameter; specified.
A US quarter is a coin worth twenty-five cents, commonly used in United States currency.
Standard copper-nickel clad US quarter: 24.26 mm diameter, 1.75 mm thickness and 5.67 g mass. Earlier silver quarters do not share this mass. The illustrated relief is representative; the circular rim is the measured span.
US Mint — circulating coin specificationsThere’s always another scale
Side by side

Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scale
Illustrative artwork · not to scaleGot a good eye for scale?