Amoeba cell
An amoeba cell is a single-celled organism that moves and engulfs food by extending temporary projections called pseudopodia.
Also known as: Amoeba proteus cell, amoeba
How big is it?
300 µm long
Defined maximum projected span · defined specimen
Typical recorded range: 200 µm to 500 µm.
A little perspective
About the same scale as Salt crystal.
Salt crystal: A salt crystal is a small, naturally occurring or manufactured piece of sodium chloride used in food and industry.
Measurements, assumptions & sources +
Amoeba cell
A defined 300 micrometre Amoeba proteus cell in an extended state. Amoebae constantly change shape, so the projected span is a specimen choice rather than a species constant.
Encyclopaedia Britannica — Amoeba
The marked defined maximum projected span is calibrated. Unmeasured illustration details are representative.
Salt crystal
A chosen 0.3 mm table-salt crystal. The irregular illustration is a scale specimen.
University of Utah — Cell size and scale
The marked characteristic size is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 300 µm
For comparison, this page uses defined maximum projected span. This is labelled defined specimen: an explicit comparison model rather than a claim that every example has the same value. The recorded range is 200 µm to 500 µm.
A defined 300 micrometre Amoeba proteus cell in an extended state. Amoebae constantly change shape, so the projected span is a specimen choice rather than a species constant.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Amoeba cell dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 300 µm | 200 µm to 500 µm | defined specimen |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · Everyday thingsSheet of paper100 µmA sheet of paper is a flat material made from cellulose pulp, used for writing, printing or packaging.
Around the same scale · MicroscopicSalt crystal300 µmA salt crystal is a small, naturally occurring or manufactured piece of sodium chloride used in food and industry.
Nearest higher value · MicroscopicGrain of sand500 µmA grain of sand is a tiny fragment of rock or mineral, commonly found on beaches and in soil.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- Encyclopaedia Britannica — AmoebaAmoebae change shape through pseudopodia; the atlas uses a defined 300 micrometre Amoeba proteus projection.
There’s always another scale
Follow your curiosity.
Microscopic10 µm cell10 µmA cell is the basic structural unit of living organisms.MicroscopicSalt crystal300 µmA salt crystal is a small, naturally occurring or manufactured piece of sodium chloride used in food and industry.MicroscopicGrain of sand500 µmA grain of sand is a tiny fragment of rock or mineral, commonly found on beaches and in soil.Everyday thingsSheet of paper100 µmA sheet of paper is a flat material made from cellulose pulp, used for writing, printing or packaging.
Living thingsPoppy seed1 mmA poppy seed is an edible seed produced by plants in the poppy family and commonly used in breads and other foods.
People70 µm hair70 µmA hair is a slender strand of protein that grows from the skin of humans and other mammals.
Living thingsCopepod2 mmA copepod is a tiny aquatic crustacean found in marine and freshwater environments, playing a key role in aquatic food webs.
Everyday thingsChia seed2 mmA chia seed is the edible seed of the Salvia hispanica plant, often used in foods such as puddings and cereals.