Geoduck
A geoduck is a large burrowing marine clam with a comparatively small shell and a very long siphon.
Also known as: Pacific geoduck, Panopea generosa
How big is it?
17 cm long
Also 6.693 in
Defined shell length · defined specimen
Typical recorded range: 12 cm to 22 cm.
A little perspective
About the same scale as Vanguard 1.
Vanguard 1: Vanguard 1 is an early American satellite launched in 1958, notable for being the oldest human-made object still in orbit.
Measurements, assumptions & sources +
Geoduck
A defined Pacific geoduck with a 17 cm shell and 1.2 kg live mass. The long siphon can extend far beyond the shell and is shown for identity, but shell length is the calibrated span.
Washington Department of Fish and Wildlife — Geoduck
The marked defined shell length is calibrated. Unmeasured illustration details are representative.
Vanguard 1
Vanguard 1 is a 16.5 cm diameter aluminium sphere with a launch mass of 1.474 kg. Its six antenna rods extend beyond the calibrated spherical body diameter.
The marked satellite body diameter is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 17 cm
For comparison, this page uses defined shell 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 12 cm to 22 cm.
A defined Pacific geoduck with a 17 cm shell and 1.2 kg live mass. The long siphon can extend far beyond the shell and is shown for identity, but shell length is the calibrated span.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Geoduck dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 17 cm | 12 cm to 22 cm | defined specimen | |
| 1.2 kg | 700 g to 2 kg | defined specimen |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · Living thingsFeather star15 cmA feather star is a marine crinoid with multiple feathery arms used for filter feeding and movement on the sea floor.
Around the same scale · SpaceVanguard 116.5 cmVanguard 1 is an early American satellite launched in 1958, notable for being the oldest human-made object still in orbit.
Nearest higher value · Living thingsQueen conch25 cmThe queen conch is a marine mollusc native to the Caribbean and western Atlantic, recognised for its spiral pink shell.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Washington Department of Fish and Wildlife — GeoduckPacific geoduck shell, siphon anatomy and broad adult size variation; the atlas defines one specimen.
There’s always another scale
Follow your curiosity.
Living thingsQueen conch25 cmThe queen conch is a marine mollusc native to the Caribbean and western Atlantic, recognised for its spiral pink shell.
Living thingsAbalone10 cmAn abalone is a marine mollusc with a flattened, ear-shaped shell, belonging to the genus Haliotis.SpaceVanguard 116.5 cmVanguard 1 is an early American satellite launched in 1958, notable for being the oldest human-made object still in orbit.
Everyday thingsCauliflower head18 cmA cauliflower head is the dense, edible white curd of the cauliflower plant, formed by undeveloped flower buds.
PeopleHuman brain15 cmThe human brain is the organ that processes sensory information and coordinates thought, memory, movement and many body functions.Living thingsFeather star15 cmA feather star is a marine crinoid with multiple feathery arms used for filter feeding and movement on the sea floor.
SportDisc golf driver21.1 cmA disc golf driver is a specialised flying disc designed for long-distance throws in the sport of disc golf.
Everyday thingsBroccoli head16 cmA broccoli head is the compact, edible crown of the broccoli plant, consisting of clustered green flower buds.