£1 coin
A £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.
How big is it?
2.343 cm across
Also 0.9224 in
Diameter · specified
A little perspective
About the same scale as Human eyeball.
Human eyeball: The human eyeball is the globe-shaped organ that receives light and begins the process of vision.
Measurements, assumptions & sources +
£1 coin
23.43 mm maximum diameter, 8.75 g. Twelve-sided circulation coin.
Royal Mint — £1 coin specifications
The marked diameter is calibrated. Unmeasured illustration details are representative.
Human eyeball
A representative adult human eye globe about 24 mm across. The corneal bulge and optic nerve are contextual and excluded from the calibrated globe diameter.
Encyclopaedia Britannica — Human eye
The marked representative globe diameter is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 2.343 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.
23.43 mm maximum diameter, 8.75 g. Twelve-sided circulation coin.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
£1 coin dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2.343 cm | Not recorded | specified | |
| 8.75 g | Not recorded | specified |
Around this scale
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These links use compatible length records, ordered around the selected value.
Nearest lower value · Everyday thingsUK 20p coin2.14 cmA UK 20p coin is the seven-sided twenty-pence denomination of the decimal pound sterling circulation coinage.
Around the same scale · Everyday thingsUS quarter2.426 cmA US quarter is a coin worth twenty-five cents, commonly used in United States currency.
Nearest higher value · Everyday thingsCacao bean2.4 cmA cacao bean is the dried seed of the Theobroma cacao tree, used to produce cocoa and chocolate.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Royal Mint — £1 coin specificationsTwelve-sided circulation coin; maximum point-to-point diameter.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
PeopleHuman eyeball2.4 cmThe human eyeball is the globe-shaped organ that receives light and begins the process of vision.Everyday thingsUS quarter2.426 cmA US quarter is a coin worth twenty-five cents, commonly used in United States currency.
Living thingsSea angel2 cmA sea angel is a small, transparent swimming sea slug with wing-like appendages, found in cold ocean waters.
Everyday thingsUK 10p coin2.45 cmA UK 10p coin is the ten-pence denomination of the decimal pound sterling circulation coinage.
SportSquash ball4 cmA squash ball is a small, hollow rubber ball used in the sport of squash.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.
PeopleFingernail1.5 cmA fingernail is the hard, protective covering at the tip of a human finger, composed of keratin.