The basic unit of length (on a ruler) is the meter, symbol m.
Two smaller units (decimal fractions of the meter are:
centimeter cm (0.01 of the meter)
millimeter mm (0.001 of the meter)
The meter is slightly larger than a yard. Approximately 39.37 inches.
Conversely one inch is 2.54 centimeters exactly.
There are several other prefixes the multiply or divide SI units in powers of 10.
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There are several, collectively known as the SI units.
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Quantity English Units Equals SI Units force lb = 4.4482 N mass Slug = 14.5938 kg length ft = 0.3048m Not really a good specified question but here are some of the more common basic English units converted to si units
International System of Units (SI)
In most of the world, everything that is measured, is measured in SI units. Time, distance, mass, weight, area, volume and so on.