yocto- y 10^-24 zepto- z 10^-21 atto- a 10^-18 femto- f 10^-15 pico- p 10^-12 nano- n 10^-9 micro- m 10^-6 milli- m 10^-3 centi- c 10^-2 deci- d 10^-1 (none) -- 10^0 deka- D 10^1 hecto- h 10^2 *kilo- k or K ** 10^3 mega- M 10^6 giga- G 10^9 tera- T 10^12 peta- P 10^15 exa- E 10^18 zetta- Z 10^21 yotta- Y 10^24