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Base and dimensionless SI units

Derived SI units with special names

Linear measures

Physical quantity

Name

Symbol

length

meter

m

mass

kilogram

kg

time

second

s

electric current

ampere

A

thermodynamic temperature

kelvin

K

luminous intensity

candela

C

amount of substance

mole

mol

plane angle*

radian

rad

solid angle*

steradian

sr

Physical quantity

Name

Symbol

frequency

hertz

Hz

energy

joule

J

force

newton

N

power

watt

W

pressure

pascal

Pa

electric charge

coulomb

C

electric potential difference

volt

V

electric resistance

ohm

O

electric conductance

siemens

S

electric capacitance

farad

F

magnetic flux

weber

Wb

inductance

henry

H

magnetic flux density (magnetic induction)

tesla

T

luminous flux

lumen

lm

illuminance

lux

lx

absorbed dose

gray

Gy

activity

becquerel

Bq

dose equivalent

sievert

Sv

Physical unit

Unit

Myriameter

10 000 m

Kilometer

1 000 m

Hectometer

100 m

Dekameter

10 m

Meter

1 m

Decimeter

0.1 m

Centimeter

0.01 m

Millimeter

0.001 m

Micrometer

0.000 001 m

1 inch (in.)

 

= 2.54 cm

1 foot (ft.)

= 12 inches

= 30.48 cm

1 yard (yd.)

= 3 feet

= 91.44 cm

1 rod (rd.), pole, perch

= 5.5 yards

= 5.03 cm

1 furlong (fur.)

= 220 yards

= 201.17 m

1 mile (mi.), statute

= 8 furlongs

= 1.609 km

* dimensionless units

Square measures

1 square inch (sq.in.)

 

= 6.45 square cm

1 square foot (sq.ft.)

= 144 square inches

= 929 square cm

1 square yard (sq.yd.)

= 9 square feet

= 0.8361 square m

1 square rod (sq.rd.)

= 30.25 square yards

= 25.29 square m

1 acre (a.)

= 160 rods

= 0.4047 ha

1 square mile

= 640 acres

= 2.59 square km

1 hectare

 

= 10,000 square m

1 are

 

= 100 square m

 

Avoirdupois weights   Cubic measures   Measures of capacity   Metric prefixes   Temperatures

© by R. Schlegel 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014

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