Human brain
The human brain is the organ that processes sensory information and coordinates thought, memory, movement and many body functions.
Also known as: adult human brain
How big is it?
15 cm long
Also 5.906 in
Representative front-to-back length · defined specimen
Typical recorded range: 14 cm to 17 cm.
A little perspective
About the same scale as Feather star.
Feather star: A feather star is a marine crinoid with multiple feathery arms used for filter feeding and movement on the sea floor.
Measurements, assumptions & sources +
Human brain
A defined adult-brain specimen 15 cm front to back and 1.4 kg. Brain size and mass vary by person; these values are comparison anchors, not health benchmarks.
Defined examples — our methodology
The marked representative front-to-back length is calibrated. Unmeasured illustration details are representative.
Feather star
A defined 15 cm feather star measured across its spread arm tips. Species, arm count and posture vary; this span includes the feathery arms and excludes detached cirri.
The marked defined arm-tip span is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 15 cm
For comparison, this page uses representative front-to-back length. This is labelled defined specimen: an explicit comparison model rather than a claim that every example has the same value. The recorded range is 14 cm to 17 cm.
A defined adult-brain specimen 15 cm front to back and 1.4 kg. Brain size and mass vary by person; these values are comparison anchors, not health benchmarks.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Human brain dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 15 cm | 14 cm to 17 cm | defined specimen | |
| 1.4 kg | 1.2 kg to 1.6 kg | representative |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · PeopleHuman heart12 cmA human heart is a muscular organ that pumps blood through the circulatory system.
Around the same scale · Living thingsFeather star15 cmA feather star is a marine crinoid with multiple feathery arms used for filter feeding and movement on the sea floor.
Nearest higher value · Everyday thingsBroccoli head16 cmA broccoli head is the compact, edible crown of the broccoli plant, consisting of clustered green flower buds.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Cleveland Clinic — BrainAdult brain anatomy and a mass around three pounds; the atlas uses a representative 1.4 kg specimen.
- Defined examples — our methodology
There’s always another scale
Follow your curiosity.
PeopleHuman1.75 mA human is a primate of the species Homo sapiens, distinguished by habitual upright walking, language and complex tool use.PeopleHuman heart12 cmA human heart is a muscular organ that pumps blood through the circulatory system.Living thingsFeather star15 cmA feather star is a marine crinoid with multiple feathery arms used for filter feeding and movement on the sea floor.
Everyday thingsCantaloupe15 cmA cantaloupe is a round, sweet melon with a netted rind and orange flesh, commonly eaten as a fruit.
SpaceVanguard 116.5 cmVanguard 1 is an early American satellite launched in 1958, notable for being the oldest human-made object still in orbit.
SportClimbing piton15 cmA climbing piton is a metal spike driven into rock cracks to provide protection or anchor points during climbing.
Everyday thingsSweet potato15 cmA sweet potato is the edible, starchy root of the plant Ipomoea batatas, widely grown for food.
Living thingsGeoduck17 cmA geoduck is a large burrowing marine clam with a comparatively small shell and a very long siphon.