Measurement Reference & SI Metric Prefixes — BIPM International System of Units (SI) cheatsheet, metric prefixes (quecto to quetta), and unit converter

International System of Units (SI) & Measurement Reference

BIPM SI base standards, conversion ratios across length, mass, volume, pressure, and digital storage.

Amount:

From:

To:

Calculated Value:0.1 m

Prefix	Symbol	Exponent	Multiplier
quetta	Q	+30	10^30 (1,000,000,000,000,000,000,000,000,000,000)
ronna	R	+27	10^27 (1,000,000,000,000,000,000,000,000,000)
yotta	Y	+24	10^24 (1,000,000,000,000,000,000,000,000)
zetta	Z	+21	10^21 (1,000,000,000,000,000,000,000)
exa	E	+18	10^18 (1,000,000,000,000,000,000)
peta	P	+15	10^15 (1,000,000,000,000,000)
tera	T	+12	10^12 (1,000,000,000,000)
giga	G	+9	10^9 (1,000,000,000)
mega	M	+6	10^6 (1,000,000)
kilo	k	+3	10^3 (1,000)
hecto	h	+2	10^2 (100)
deca	da	+1	10^1 (10)
(base)	—	+0	10^0 (1)
deci	d	-1	10^-1 (0.1)
centi	c	-2	10^-2 (0.01)
milli	m	-3	10^-3 (0.001)
micro	µ	-6	10^-6 (0.000001)
nano	n	-9	10^-9 (0.000000001)
pico	p	-12	10^-12 (0.000000000001)
femto	f	-15	10^-15 (0.000000000000001)
atto	a	-18	10^-18 (0.000000000000000001)
zepto	z	-21	10^-21 (0.000000000000000000001)
yocto	y	-24	10^-24 (0.000000000000000000000001)
ronto	r	-27	10^-27
quecto	q	-30	10^-30

Prefix

Symbol

Exponent

Multiplier

quetta

+30

10^30 (1,000,000,000,000,000,000,000,000,000,000)

ronna

+27

10^27 (1,000,000,000,000,000,000,000,000,000)

yotta

+24

10^24 (1,000,000,000,000,000,000,000,000)

zetta

+21

10^21 (1,000,000,000,000,000,000,000)

exa

+18

10^18 (1,000,000,000,000,000,000)

peta

+15

10^15 (1,000,000,000,000,000)

tera

+12

10^12 (1,000,000,000,000)

giga

10^9 (1,000,000,000)

mega

10^6 (1,000,000)

kilo

10^3 (1,000)

hecto

10^2 (100)

deca

10^1 (10)

(base)

—

10^0 (1)

deci

-1

10^-1 (0.1)

centi

-2

10^-2 (0.01)

milli

-3

10^-3 (0.001)

micro

-6

10^-6 (0.000001)

nano

-9

10^-9 (0.000000001)

pico

-12

10^-12 (0.000000000001)

femto

-15

10^-15 (0.000000000000001)

atto

-18

10^-18 (0.000000000000000001)

zepto

-21

10^-21 (0.000000000000000000001)

yocto

-24

10^-24 (0.000000000000000000000001)

ronto

-27

10^-27

quecto

-30

10^-30

About Measurement Reference & SI Metric Prefixes

Comprehensive technical measurement reference and dimensional analysis guide based on BIPM SI standards and NIST specifications. Reference SI base units, Imperial and US Customary conversion ratios for length, mass, volume, pressure, and digital storage. Includes the complete SI metric prefixes table from quecto (10^-30) to quetta (10^30).

Key Capabilities & Features

Complete BIPM SI metric prefixes table covering all 24 prefixes from quecto (10^-30) to quetta (10^30)
Reference conversion factors for length, mass/weight, volume, pressure, and digital data storage
Interactive multi-dimension unit converter with high-precision floating point accuracy
Clear differentiation between SI base units, Imperial standards, and US Customary systems
Distinguishes between decimal storage (GB = 10^9) and binary storage (GiB = 2^30)

How to Use Measurement Reference & SI Metric Prefixes

Select Dimension

Choose Length, Mass, Volume, Pressure, or Digital Data Storage.

Convert Values

Enter an amount and select source and target units for instant calculation.

Review SI Prefixes

Scroll through the metric prefix table to inspect powers of 10 and multipliers.

Copy Converted Result

Copy the calculated figure and symbol for engineering documents.

Privacy & In-Browser Execution Guarantee

100% Client-Side. Scientific calculations and conversion formulas evaluate locally in-browser.

Frequently Asked Questions

What are the 7 SI base units?

The seven SI base units are: Meter (length), Kilogram (mass), Second (time), Ampere (electric current), Kelvin (temperature), Mole (amount of substance), and Candela (luminous intensity).