Bottle cap
A bottle cap is a small closure used to seal the opening of a bottle and keep its contents secure.
How big is it?
2.8 cm across
Also 1.102 in
Diameter · example
A little perspective
Bottle cap vs UK £2 coin: diameter comparison
The diameter of a UK £2 coin is about 1.01 times the diameter of a bottle cap.
A bottle cap is a small closure used to seal the opening of a bottle and keep its contents secure.
A UK £2 coin is the bimetallic two-pound denomination of the pound sterling circulation coinage.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Bottle cap
Diameter: 2.8 cm; example.
A defined 28 mm diameter cap.
Defined examples — our methodology
The marked diameter is calibrated. Unmeasured illustration details are representative.
UK £2 coin
Specified diameter: 2.84 cm; specified.
Bimetallic UK two-pound circulation format: 28.4 mm diameter, 2.5 mm thickness and 12 g mass. Bimetallic means an outer ring and inner disc; earlier single-metal or collector issues are not the comparison input.
Royal Mint — bimetallic £2 specifications
The marked specified diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 2.8 cm
We compare the diameter of a bottle cap. This is an illustrative comparison value, not a claim that every example is the same.
A defined 28 mm diameter cap.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2.8 cm | Not recorded | example |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueEveryday objectsUK 50p coin2.73 cmSpecified maximum diameterA UK 50p coin is the seven-sided fifty-pence denomination of the decimal pound sterling circulation coinage.
Around the same scaleEveryday objectsUK 2p coin2.59 cmSpecified diameterA UK 2p coin is the two-pence denomination of the decimal pound sterling circulation coinage.
Nearest higher valueEveryday objectsUK £2 coin2.84 cmSpecified diameterA UK £2 coin is the bimetallic two-pound denomination of the pound sterling circulation coinage.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
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