UK 20p coin
A UK 20p coin is the seven-sided twenty-pence denomination of the decimal pound sterling circulation coinage.
Also known as: British 20p coin, twenty pence coin
How big is it?
2.14 cm · specified maximum diameter
Also 0.843 in
Specified maximum diameter · specified
Format: Cupro-nickel, seven-sided. UK 20p coin: 21.4 mm (0.843 in) maximum span, 1.7 mm (0.067 in) thick, and 5 g in mass. Diameter measures across the face, not the edge thickness.
Check UK 20p coin material and older-format differences. Compare UK and US coin dimensions.
A little perspective
UK 20p coin vs US nickel: diameter comparison
The maximum diameter of a UK 20p coin is about 1.01 times the diameter of a US nickel.
A UK 20p coin is the seven-sided twenty-pence denomination of the decimal pound sterling circulation coinage.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
UK 20p coin
Specified maximum diameter: 2.14 cm; specified.
Cupro-nickel UK 20p: 21.4 mm maximum span, 1.7 mm thickness and 5 g mass. Its equilateral-curve heptagon has constant breadth; a different portrait or reverse does not by itself change these specifications.
Royal Mint — 20p specifications
The marked specified maximum diameter is calibrated. Unmeasured illustration details are representative.
US nickel
Diameter: 2.121 cm; specified.
Cupro-nickel US nickel: 21.21 mm diameter, 1.95 mm thickness and 5 g mass. These nominal specifications do not describe every historical composition.
US Mint — circulating coin specifications
The marked 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 2.14 cm
We compare the maximum diameter of a UK 20p coin. This value follows a stated specification; check its scope in the notes.
Cupro-nickel UK 20p: 21.4 mm maximum span, 1.7 mm thickness and 5 g mass. Its equilateral-curve heptagon has constant breadth; a different portrait or reverse does not by itself change these specifications.
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 |
|---|---|---|---|
| 21.4 mm (0.843 in) | Not recorded | specified - Cupro-nickel, seven-sided | |
| 1.7 mm (0.067 in) | Not recorded | specified - Cupro-nickel, seven-sided | |
| 5 g | Not recorded | specified - Cupro-nickel, seven-sided |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueEveryday objectsUS nickel2.121 cmDiameterA US nickel is a five-cent coin made primarily of a copper-nickel alloy.
Around the same scaleEveryday objectsUK 10p coin2.45 cmSpecified diameterA UK 10p coin is the ten-pence denomination of the decimal pound sterling circulation coinage.
Nearest higher valueEveryday objects£1 coin2.343 cmSpecified maximum diameterA £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Royal Mint — 20p specificationsCupro-nickel format: 21.4 mm maximum span, 1.7 mm thickness and 5 g.
There’s always another scale
Follow your curiosity.
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