Arithmetic/Geometry » Converting units

Check Imperial and US units for converting other units.

For prefixes bigger than kilo and smaller than milli, check the bottom of this page.

Distance / Length

Every step: :10   or: decimal dot 1 place to the left

Every step: ×10   or: decimal dot 1 place to the right

km

hm

dam

m

dm

cm

mm

Area

Every step: :100   or: decimal dot 2 place to the left

Every step: ×100   or: decimal dot 2 place to the right

km2

hm2

dam2

m2

dm2

cm2

mm2

hectare (ha)

are (a)

Volume (m³)

Every step: :1000   or: decimal dot 3 place to the left

Every step: ×1000   or: decimal dot 3 place to the right

km3

hm3

dam3

m3

dm3

cm3

mm3

kilolitres (kl or kL)

litres (l or L)

millilitres (ml or mL)

Volume (litres)

Every step: :10   or: decimal dot 1 place to the left

Every step: ×10   or: decimal dot 1 place to the right

kL

hL

daL

L

dL

cL

mL

m3

dm3

cm3

Weight

Every step: :10   or: decimal dot 1 place to the left

Every step: ×10   or: decimal dot 1 place to the right

kg

hg

dag

g

dg

cg

mg

(Dutch) ounce

Other prefixes

Kilo to milli are not the only prefixes you can use. There are other SI-prefixes or metric prefixes. In the table below you can find them from 10²⁴ to 10^–24.

SI stands for 'Système international d'unités' which you can probably guess the English translation for.

Symbol	Name	Decimal
Y	yotta	1024	= 1 000 000 000 000 000 000 000 000
Z	zetta	1021	= 1 000 000 000 000 000 000 000
E	exa	1018	= 1 000 000 000 000 000 000
P	peta	1015	= 1 000 000 000 000 000
T	tera	1012	= 1 000 000 000 000
G	giga	109	= 1 000 000 000
M	mega	106	= 1 000 000
k	kilo	103	= 1000
h	hecto	102	= 100
da	deca	101	= 10
		100	= 1
d	deci	10–1	= 0.1
c	centi	10–2	= 0.01
m	milli	10–3	= 0.001
µ	micro	10–6	= 0.000 001
n	nano	10–9	= 0.000 000 001
p	pico	10–12	= 0.000 000 000 001
f	femto	10–15	= 0.000 000 000 000 001
a	atto	10–18	= 0.000 000 000 000 000 001
z	zepto	10–21	= 0.000 000 000 000 000 000 001
y	yocto	10–24	= 0.000 000 000 000 000 000 000 001

Watch out!
If you write a m while you meant a M, you are wrong by a factor 10⁹.
The biggest two are the capital Y and Z and the smallest two are the lower case y and z. If you write a Y while you meant a y, you are wrong by a factor 10⁴⁸!

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