anthropometry.
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Using a website which deals with conversion of measurements units Click on the related link, that site is amazing, very efficient, and provides precise values for metric system conversion.
They are the U.S. measurements. Instead of the Metric system that uses meters, the Customary system uses feet and inches.
Both systems have measurements for distance, area, volume, and mass or weight.
The English system and the metric system.
Small: micrometers or nanometers (if it's really small, then zeptometers or yoctometers). Large: gigameters or terrameters (if it's really large, then zettameters or yottameters).