Orders of Magnitude for Area

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This article presents a compilation of areas of different sizes for comparative purposes. The information provided is often to be understood as 'typical values', and the converted values are rounded.

Units of Area

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The unit of area derived from the base unit meter in the International System of Units (SI) is the square meter, denoted by m².

### Derived Units of Area

* 1 mm² (square millimeter) = 0.000001 m² (1,000,000 mm² = 1 m²)
* 1 cm² (square centimeter) = 0.0001 m² (10,000 cm² = 1 m²)
* 1 a (are) = 100 m²
* 1 ha (hectare) = 100 a = 10,000 m²
* 1 km² (square kilometer) = 100 ha = 1,000,000 m²

### Smaller Units of Area

* Areas less than 1 mm²:
+ 100 fm² – 1 barn
+ 1 nm² – visibility limit electron microscope
* 1 square micrometer (μm²) = 1,000,000 nm² (square nanometers)
+ 0.05 μm² – surface of a flu virus
+ 0.20 μm² – visibility limit light microscope
+ 500 μm² – surface of a bacterium

### Larger Units of Area

* 1 mm² to 100 mm² (1 cm²):
+ 1 mm² – boxes on millimeter paper
+ 2 mm² to 50 mm² – pupil of a person, depending on the incidence of light
+ 25 mm² – box
* Other examples:
+ 0.15 mm² – surface of a human egg
+ 0.20 mm² – cross-sectional area of the lead of a pencil (0.5 mm)

Note: The values provided are typical and rounded for comparative purposes.