Appendix D—Metric Prefixes

Prefix Symbol Name Power of 10 Multiplier

yotta Y 1 septillion 10²⁴ 1,000,000,000,000,000,000,000,000

zetta Z 1 sextillion 10²¹ 1,000,000,000,000,000,000,000

exa E 1 quintillion 10¹⁸ 1,000,000,000,000,000,000

peta P 1 quadrillion 10¹⁵ 1,000,000,000,000,000

tera T 1 trillion 10¹² 1,000,000,000,000

giga G 1 billion 10⁹ 1,000,000,000

mega M 1 million 10⁶ 1,000,000

kilo k 1 thousand 10³ 1,000

hecto h 1 hundred 10² 1,00

deka da 1 ten 10¹ 10

deci d 1 tenth 10^-1 0.1

centi c 1 hundredth 10^-2 0.01

milli m 1 thousandth 10^-3 0.001

micro µ 1 millionth 10^-6 0.000,001

nano n 1 billionth 10^-9 0.000,000,001

pico p 1 trillionth 10^-12 0.000,000,000,001

femto f 1 quadrillionth 10^-15 0.000,000,000,000,001

atto a 1 quintillionth 10^-18 0. 000,000,000,000,000,001

zepto z 1 sextillionth 10^-21 0. 000,000,000,000,000,000,001

yocto y 1 septillionth 10^-24 0. 000,000,000,000,000,000,000,001