US nickel
A US nickel is a five-cent coin made primarily of a copper-nickel alloy.
How big is it?
2.121 cm across
Also 0.835 in
Diameter · specified
A little perspective
About the same scale as UK 20p coin.
UK 20p coin: A UK 20p coin is the seven-sided twenty-pence denomination of the decimal pound sterling circulation coinage.
Measurements, assumptions & sources +
US nickel
21.21 mm nominal diameter; 5 g.
US Mint — circulating coin specifications
The marked diameter is calibrated. Unmeasured illustration details are representative.
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.
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Why this measurement?
Why we use 2.121 cm
For comparison, this page uses diameter. The record labels this value specified, so the stated convention rather than an inferred average controls the comparison.
21.21 mm nominal diameter; 5 g.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
US nickel dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2.121 cm | 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.
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Want to check the number?
The source records and measurement method remain available for inspection.
- US Mint — circulating coin specificationsNominal current-format coin dimensions and masses.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
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