UK 1p coin
A UK 1p coin is the one-penny denomination of the decimal pound sterling circulation coinage.
Also known as: British 1p coin, UK penny, one penny coin
How big is it?
2.03 cm · specified diameter
Also 0.799 in
Specified diameter · specified
Format: Copper-plated steel. UK 1p coin: 20.3 mm (0.799 in) in diameter, 1.65 mm (0.065 in) thick, and 3.56 g in mass. Diameter measures across the face, not the edge thickness.
Check UK 1p coin material and older-format differences. Compare UK and US coin dimensions.
A little perspective
UK 1p coin vs Sea angel: length comparison
The diameter of a UK 1p coin is about 1.02 times the body length of a sea angel.
A UK 1p coin is the one-penny denomination of the decimal pound sterling circulation coinage.
A sea angel is a small, transparent swimming sea slug with wing-like appendages, found in cold ocean waters.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. Horizontal rulers compare the selected spans; vertical brackets also identify height on the artwork.
Measurements, assumptions & sources +
UK 1p coin
Specified diameter: 2.03 cm; specified.
Copper-plated steel UK 1p: 20.3 mm diameter, 1.65 mm thickness and 3.56 g mass. Bronze pennies have a published thickness of 1.52 mm; both materials share the stated diameter and mass.
Royal Mint — 1p specifications
The marked specified diameter is calibrated. Unmeasured illustration details are representative.
Sea angel
Defined body length: 2 cm; representative specimen; range 1 cm–4 cm.
A defined 2 cm adult sea angel modelled on Clione limacina. Body length excludes the extended wing-like parapodia; species, maturity and posture change the span.
The marked defined body length 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 2.03 cm
We compare the diameter of a UK 1p coin. This value follows a stated specification; check its scope in the notes.
Copper-plated steel UK 1p: 20.3 mm diameter, 1.65 mm thickness and 3.56 g mass. Bronze pennies have a published thickness of 1.52 mm; both materials share the stated diameter and mass.
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 |
|---|---|---|---|
| 20.3 mm (0.799 in) | Not recorded | specified - Copper-plated steel | |
| 1.65 mm (0.065 in) | Not recorded | specified - Copper-plated steel | |
| 3.56 g | Not recorded | specified - Copper-plated steel |
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 5p coin1.8 cmSpecified diameterA UK 5p coin is the five-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 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 — 1p specifications20.3 mm diameter, 3.56 g; bronze 1.52 mm thick, copper-plated steel 1.65 mm.
There’s always another scale
Follow your curiosity.
Everyday thingsUK 2p coin2.59 cmA UK 2p coin is the two-pence denomination of the decimal pound sterling circulation coinage.Everyday thingsUK 5p coin1.8 cmA UK 5p coin is the five-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.
Living thingsSea angel2 cmA sea angel is a small, transparent swimming sea slug with wing-like appendages, found in cold ocean waters.
Everyday thingsUS nickel2.121 cmA US nickel is a five-cent coin made primarily of a copper-nickel alloy.
PeopleHuman eyeball2.4 cmThe human eyeball is the globe-shaped organ that receives light and begins the process of vision.
Everyday thingsUK 20p coin2.14 cmA UK 20p coin is the seven-sided twenty-pence denomination of the decimal pound sterling circulation coinage.
Living thingsBird’s nest fungus2 cmBird’s nest fungus is a small fungus whose fruiting body resembles a tiny nest containing spore-filled capsules called peridioles.