Metric Prefixes
Reference Table

Complete reference for SI metric prefixes from yocto (10⁻²⁴) to yotta (10²⁴), with a conversion tool.

Metric Conversion Calculator

Result
1.0000e-9 Pm
PrefixSymbolPower of 10Factor
yottaY10241,000,000,000,000,000,000,000,000
zettaZ10211,000,000,000,000,000,000,000
exaE10181,000,000,000,000,000,000
petaP10151,000,000,000,000,000
teraT10121,000,000,000,000
gigaG1091,000,000,000
megaM1061,000,000
kilok1031,000
hectoh102100
decada10110
(base)1001
decid10-10.1
centic10-20.01
millim10-30.001
microμ10-60.000001
nanon10-90.000000001
picop10-120.000000000001
femtof10-150.000000000000001
attoa10-180.000000000000000001
zeptoz10-210.000000000000000000001
yoctoy10-240.000000000000000000000001

Common Examples

Length

1 km = 1,000 m
1 cm = 0.01 m
1 mm = 0.001 m
1 nm = 0.000000001 m (nanometer)

Data Storage

1 KB = 1,000 bytes
1 MB = 1,000,000 bytes
1 GB = 1,000,000,000 bytes
1 TB = 1,000,000,000,000 bytes

Mass

1 kg = 1,000 g
1 mg = 0.001 g
1 μg (microgram) = 0.000001 g

Time & Frequency

1 ms (millisecond) = 0.001 s
1 MHz = 1,000,000 Hz
1 GHz = 1,000,000,000 Hz