Human eyeball
The human eyeball is the globe-shaped organ that receives light and begins the process of vision. The optic nerve carries visual signals to the brain.
Also known as: eye globe, human eye
How big is it?
2.4 cm across
Also 0.9449 in
Representative globe diameter · representative
Typical recorded range: 2.3 cm to 2.5 cm.
A little perspective
About the same scale as US quarter.
US quarter: A US quarter is a coin worth twenty-five cents, commonly used in United States currency.
Measurements, assumptions & sources +
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.
US quarter
A US quarter: 24.26 mm nominal diameter and 5.67 g mass. The illustrated relief is representative; the circular rim is the measured span.
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 2.4 cm
For comparison, this page uses representative globe diameter. This is labelled representative; the central value is useful for comparison, while real values or measurement solutions can vary. The recorded range is 2.3 cm to 2.5 cm.
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.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Human eyeball dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2.4 cm | 2.3 cm to 2.5 cm | representative |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · Everyday things£1 coin2.343 cmA £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.
Around the same scale · Everyday thingsCacao bean2.4 cmA cacao bean is the dried seed of the Theobroma cacao tree, used to produce cocoa and chocolate.
Nearest higher value · Everyday thingsUS quarter2.426 cmA US quarter is a coin worth twenty-five cents, commonly used in United States currency.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Encyclopaedia Britannica — Human eyeThe adult eye globe is approximately 24 mm in diameter; anatomy varies by person and axis.
There’s always another scale
Follow your curiosity.
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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 things£1 coin2.343 cmA £1 coin is a twelve-sided British coin used as standard currency in the United Kingdom.
PeopleFingernail1.5 cmA fingernail is the hard, protective covering at the tip of a human finger, composed of keratin.
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.