Metric fact sheet

Metric units

Meter is the unit for linear measurement.

Liter is the unit for volume. One liter is a little more than a quart.

Gram is the unit for mass. One gram is about the weight of a paper clip.

Most used prefixes for metric units:

Some prefixes on a number line:

metric units image


Hair and dust particle size


Metric prefixes

Metric prefixes, symbols, & powers
Prefix Symbol Power
Quecca Q 1030
Ronna R 1027
Yotta Y


Zetta Z 1021
Exa E 1018
Peta P 1015
Tera T 1012
Giga G 109
Mega M 106
kilo k 103
milli m 10-3
micro μ 10-6
nano n


pico p


femto f 10-15
atto a 10-18
zepto z 10-21
yocto y 10-24
ronto r 10-27
quecto q 10-30


See also: History of measurement

Dr. Robert Sweetland's notes &