Unit full name abbreviation conversion Kilo K 1K byte = 1, 024 bytes Meg M 1M byte = 1,048,576 bytes Giga G 1G byte = 1,073,741,824 bytes Tera T 1T bytes = 1,099,511,627,776 bytes Peta P 1P bytes = 1,125,899,906,842,624 bytes Exa E 1E bytes = 1,152,921,504,606,846,976 bytes Zetta Z 1Z bytes = 1,180,591,620,717,411,303,424 bytes Yotta Y 1Y bytes = 1,208,925,819,614,629,174,706,176 bytes
Prefix |
Symbol |
1000m |
10n |
Decimal |
| Short Scale
Long | Scale
Since[1] |
Yotta |
Y |
10008 |
1024 |
1000000000000000000000000 |
Septillion |
Quadrillion |
1991 |
Zetta |
Z |
10007 |
1021 |
1000000000000000000000 |
Sextillion |
Trilliard |
1991 |
Exa |
E |
10006 |
1018 |
1000000000000000000 |
Quintillion |
Trillion |
1975 |
Peta |
P |
10005 |
1015 |
1000000000000000 |
Quadrillion |
Billiard |
1975 |
Tera |
T |
10004 |
1012 |
1000000000000 |
Trillion |
Billion |
1960 |
Giga |
G |
10003 |
109 |
1000000000 |
Billion |
Milliard |
1960 |
Mega |
M |
10002 |
106 |
1000000 |
Million |
1960 |
Kilo |
K |
10001 |
103 |
1000 |
Thousand |
1795 |
Hecto |
H |
10002⁄3 |
102 |
100 |
Hundred |
1795 |
Deca |
Da |
10001⁄3 |
101 |
10 |
Ten |
1795 |
|
|
10000 |
100 |
1 |
One |
|
Deci |
D |
1000−1⁄3 |
10−1 |
0.1 |
Tenth |
1795 |
Centi |
C |
1000−2⁄3 |
10−2 |
0.01 |
Hundredth |
1795 |
Milli |
M |
1000−1 |
10−3 |
0.001 |
Thousandth |
1795 |
Micro |
µ |
1000−2 |
10−6 |
0.000001 |
Millionth |
1960[2] |
Nano |
N |
1000−3 |
10−9 |
0.000000001 |
Billionth |
Milliardth |
1960 |
Pico |
P |
1000−4 |
10−12 |
0.000000000001 |
Trillionth |
Billionth |
1960 |
Femto |
F |
1000−5 |
10−15 |
0.000000000000001 |
Quadrillionth |
Billiardth |
1964 |
Atto |
A |
1000−6 |
10−18 |
0.000000000000000001 |
Quintillionth |
Trillionth |
1964 |
Zepto |
Z |
1000−7 |
10−21 |
0.000000000000000000001 |
Sextillionth |
Trilliardth |
1991 |
Yocto |
Y |
1000−8 |
10−24 |
0.000000000000000000000001 |
Septillionth |
Quadrillionth
|