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Metric Prefixes CHART This chart has some of the prefixes that the metric system uses. The prefixes go before any metric unit (meter, liter, gram, etc.). To figure out what the prefix means, think like this: The small number above the 10 in the exponent column (called the exponent or power) tells you how many zeros are after the number 1 - unless it is negative. Then it tells how many decimal places there are after the decimal point. The prefix tells you how many metric units (meter, liter,etc.) you use. For example, since the mega- prefix means 1,000,000 - a megameter is 1,000,000 meters. NOTE: For a better explanation on powers click on this link. Powers EXPONENT| PREFIX| NUMBER 1024 YOTTA 1,000,000,000,000,000,000,000,000 1021 ZETTA 1,000,000,000,000,000,000,000 1018 EXA 1,000,000,000,000,000,000 1015 PETA 1,000,000,000,000,000 1012 TERA 1,000,000,000,000 109 GIGA 1,000,000,000 106 MEGA 1,000,000 103 KILO 1,000 102 HECTO 100 101 DEKA 10 10-1 DECI .1 10-2 CENTI .01 10-3 MILLI .001 10-6 MICRO .000 001 10-9 NANO .000 000 001 10-12 PICO .000 000 000 001 10-15 FEMTO .000 000 000 000 001 10-18 ATTO .000 000 000 000 000 001 10-21 ENTO .000 000 000 000 000 000 001 10-24 FITO .000 000 000 000 000 000 000 001 10-27 SYTO .000 000 000 000 000 000 000 000 001 10-30 TREDO . 000 000 000 000 000 000 000 000 000 001  Charts, Metric Charts, Big Numbers Problems Number Maze  Back to numbers homepage Back to top