This document provides a table listing common engineering prefix multipliers used with units of measurement from yocto to yotta, along with their decimal, binary, and hexadecimal representations. The prefixes and their associated multipliers allow expressing very large or small quantities in a standardized way. Notes are included to define common numeric terms like million, billion, and trillion used with the prefixes.

1. Engineering Prefix Multiplier (C)Amos D. Tsai, Monday, April 22, 2002
1
Decimal Representation Binary Representation
Prefix Symbol 8 Power of
10
Real Amount
Power of
2
Real Amount
yocto- y 10-24
0.000 000 000 000 000 000 000 001
zepto- z 10-21
0.000 000 000 000 000 000 001
atto- a 10-18
0.000 000 000 000 000 001
femto- f 10-15
0.000 000 000 000 001
pico- p 10-12
0.000 000 000 001
nano- n 10-9
0.000 000 001
micro- µ 10-6
0.000 001
milli- m 10-3
0.001
centi- c 10-2
0.01
deci- d 10-1
0.1
--- --- 100
1 20
1
deka- D 101
10 --- ---
hecto- h 102
100 --- ---
kilo- k / K
k = 103
1000 K = 210
1024
mega- M ¡£¢ 106
1,000,000 220
1,048,576
giga- G ¤¦¥ 109
1,000,000,000 230
1,073,741,824
tera- T § 1012
1,000,000,000,000 240
109,951,162,776
peta- P
§ 1015
1,000,000,000,000,000 250
1,125,899,906,842,624
exa- E ¡©¨ 1018
1,000,000,000,000,000,000 260
1,152,921,504,606,846,976
zetta- Z ¤© 1021
1,000,000,000,000,000,000,000 270
1,180,591,620,717,411,303,424
yotta- Y 1024
1,000,000,000,000,000,000,000,000 280
1,208,925,819,614,629,174,706,176
Note1: 6 Ȟ ֧ C Ԩ ҠƋ
Ƌ ʖƋ ̧ Ƌ ( )Ƌ ࠊ ( )Ƌ ๙ ( ! )Ƌ p Ƌ ’ Ƌ ɱ Ƌ ҹ ƌ
Note2: 1 million= 1 M= Ҡ; 1 billion= 1G= 5
; 1 trillion= 1T= ʖƌ
Note3: Ten thousand= 1 Ҡ; One hundred thousand= 10 Ҡ; One million= 100 Ҡ; Ten million= 6 Ҡ;
One hundred million=
; 1 billion= 5
ƌ

2. Engineering Prefix Multiplier (C)Amos D. Tsai, Monday, April 22, 2002
2
Hexadecimal Representation:
4K ( 1000h)
256 ( 100h)
16 ( 10h)
64K ( 1 0000h)
1M ( 10 0000h)
16M ( 100 0000h)
256M (1000 0000h)4G
64G
1T
16T
256T
4P
64P
1E
16E