SI Prefixes

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SI Prefixes

📐 SI Prefixes

International System of Units (SI) metric prefixes from yocto (10⁻²⁴) to yotta (10²⁴)

Prefix	Symbol	Factor	Power	Example
quetta	Q	1,000,000,000,000,000,000,000,000,000,000	10³⁰	—
ronna	R	1,000,000,000,000,000,000,000,000,000	10²⁷	—
yotta	Y	1,000,000,000,000,000,000,000,000	10²⁴	—
zetta	Z	1,000,000,000,000,000,000,000	10²¹	Global data ~100 ZB
exa	E	1,000,000,000,000,000,000	10¹⁸	1 EHz = X-ray freq
peta	P	1,000,000,000,000,000	10¹⁵	1 PB = 1000 TB
tera	T	1,000,000,000,000	10¹²	1 THz, 1 TB hard drive
giga	G	1,000,000,000	10⁹	2.4 GHz WiFi
mega	M	1,000,000	10⁶	1 MΩ resistor
kilo	k	1,000	10³	4.7 kΩ resistor
hecto	h	100	10²	1013 hPa (atm pressure)
deca	da	10	10¹	1 daN = 10 N
(base)	—	1	10⁰	1 V, 1 A, 1 Ω
deci	d	0.1	10⁻¹	1 dB (decibel)
centi	c	0.01	10⁻²	1 cm
milli	m	0.001	10⁻³	20 mA LED current
micro	µ	0.000001	10⁻⁶	100 µF capacitor
nano	n	0.000000001	10⁻⁹	100 nF (0.1µF) cap
pico	p	0.000000000001	10⁻¹²	22 pF capacitor
femto	f	0.000000000000001	10⁻¹⁵	1 fF (IC capacitance)
atto	a	10⁻¹⁸	10⁻¹⁸	Electron charge ~160 aC
zepto	z	10⁻²¹	10⁻²¹	—
yocto	y	10⁻²⁴	10⁻²⁴	—
ronto	r	10⁻²⁷	10⁻²⁷	—
quecto	q	10⁻³⁰	10⁻³⁰	—

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