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 across
Also 0.8425 in
Specified maximum diameter · specified
A little perspective
About the same scale as US nickel.
US nickel: A US nickel is a five-cent coin made primarily of a copper-nickel alloy.
Measurements, assumptions & sources +
UK 20p coin
The current UK twenty-pence circulation coin has a 21.4 mm maximum diameter, is 1.7 mm thick and weighs 5 g. Its equilateral-curve heptagon has constant breadth.
Royal Mint — UK coin designs and specifications
The marked specified maximum diameter is calibrated. Unmeasured illustration details are representative.
US nickel
21.21 mm nominal diameter; 5 g.
US Mint — circulating coin specifications
The marked diameter is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 2.14 cm
For comparison, this page uses specified maximum diameter. The record labels this value specified, so the stated convention rather than an inferred average controls the comparison.
The current UK twenty-pence circulation coin has a 21.4 mm maximum diameter, is 1.7 mm thick and weighs 5 g. Its equilateral-curve heptagon has constant breadth.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
UK 20p coin dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2.14 cm | Not recorded | specified | |
| 1.7 mm | Not recorded | specified | |
| 5 g | Not recorded | specified |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · Everyday thingsUS nickel2.121 cmA US nickel is a five-cent coin made primarily of a copper-nickel alloy.
Around the same scale · Everyday thingsUK 10p coin2.45 cmA UK 10p coin is the ten-pence denomination of the decimal pound sterling circulation coinage.
Nearest higher value · Everyday things£1 coin2.343 cmA £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 — UK coin designs and specificationsCurrent circulation denomination dimensions, masses, compositions and design history.
There’s always another scale
Follow your curiosity.
Everyday thingsUK 10p coin2.45 cmA UK 10p coin is the ten-pence denomination of the decimal pound sterling circulation coinage.
Everyday thingsUK 50p coin2.73 cmA UK 50p coin is the seven-sided fifty-pence denomination of the decimal pound sterling circulation coinage.Everyday things£1 coin2.343 cmA £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.Everyday thingsUS nickel2.121 cmA US nickel is a five-cent coin made primarily of a copper-nickel alloy.
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