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Unit Conversions
Conversion of units
From Wikipedia, the free encyclopedia.
This article lists conversion factors between a number of
units.
| Name of unit |
Symbol |
Relation to
SI
units |
| Length, l |
|
meter (SI
base unit) |
m |
|
|
micron |
μ |
= μm = 10-6 m |
|
ångström |
Å |
= 10-10 m |
|
bohr (au) |
a0, b |
~ 5.291 77 × 10-11 m |
|
x unit |
X |
~ 1.002 × 10-13 m |
|
Fermi |
|
= 1×10-15 m |
|
inch |
in |
= 2.54 × 10-2 m |
|
foot |
ft |
= 12 in = 0.3048 m |
|
yard |
yd |
= 3 ft = 0.9144 m |
|
mile |
mi |
= 1760 yd = 1609.344 m |
|
nautical mile |
|
= 1852 m ~ 6076.1 feet |
|
geographical mile |
|
= 1855 m = 6087.15 feet |
|
astronomical unit |
AU |
=
1.495 978 706 6
× 1011
m |
|
parsec |
pc |
=
3.085 677 580 666 31
× 1016
m |
|
light year |
l.y. |
=
9.460 730 473
× 1015
m |
|
light second |
|
=
2.997 924 58
× 108
m |
|
mil |
|
= 1×10-3 in = 2.54 ×10-5 m m |
|
Rod |
|
= 5.029 210 058 42 m |
|
Chain |
|
= 20.116 840 233 7 m |
|
Fathom |
|
= 1.8288 m |
|
Area, A |
| square
metre (SI
unit) |
m2 |
|
|
barn |
b |
10-28 m2 |
|
acre |
|
~ 4046.856 m2 |
|
are |
a |
= 100 m2 |
|
hectare |
ha |
= 104 m2 |
|
Volume, V |
| cubic
metre (SI
unit) |
m3 |
|
|
litre |
l, L |
= dm3 = 10-3 m3 |
|
lambda |
λ |
= μl = 10-6 dm3 |
|
barrel (US) |
|
~ 158.987 dm3 |
|
gallon (US) |
gal (US) |
≅ 3.785 41 dm3 |
|
gallon (UK) |
gal (UK) |
= 4.546 09 dm3 |
|
fluid ounce (US) |
fl. oz. (US) |
≅ 29.57 ml |
|
fluid ounce (Imperial) |
fl. oz. (Imp.) |
≅ 28.41 ml |
|
Mass, m |
|
kilogram (SI
base unit) |
kg |
|
|
electron mass (au) |
me |
~ 9.109 39 × 10-31 kg |
|
unified atomic mass unit, dalton |
u, Da |
~ 1.660 540 × 10-27 kg |
|
gamma |
γ |
= μg |
|
tonne |
t |
= 103 kg |
|
pound (avoirdupois) |
lb, in physics "lbm" |
= 0.453 592 37 kg |
|
ounce (avoirdupois) |
oz |
~ 28.349 5 g |
|
ounce (troy) |
oz (troy) |
~ 31.103 5 g |
|
grain |
gr |
= 64.798 91 mg |
|
Time, t |
|
second (SI
base unit) |
s |
|
|
au of time |
|
~ 2.418 88 × 10-17 s |
|
minute |
min |
= 60 s |
|
hour |
h |
= 3600 s |
|
day |
d |
= 86 400 s (not exactly defined due to
leap seconds) |
|
year |
a |
~ 31 556 952 s |
|
svedberg |
Sv |
~ 10-13 s |
|
Acceleration, a |
| (SI
unit) |
m·s-2 |
|
| standard acceleration of free fall |
gn |
= 9.806 65 m·s-2 |
|
galileo |
Gal |
= 10-2 m·s-2 |
|
Force, F |
|
newton (SI
unit) |
N |
= kg·m·s-2 |
|
dyne (cgs
unit) |
dyn |
= 10-5N |
|
au of force |
|
~ 8.238 73 × 10-8N |
|
pound-force |
lbf |
≅ 4.448 22 N |
|
kilogram-force |
kgf |
= 9.806 65 N |
|
Pressure, p |
|
pascal (SI
unit) |
Pa |
= N·m-2 = kg·m-1·s-2 |
|
atmosphere |
atm |
= 101 325 Pa |
|
bar |
bar |
= 105 Pa |
|
torr |
Torr |
= (101 325/760) Pa ~ 133.322 Pa |
|
millimetre of mercury (conventional) |
mmHg |
= 13.5951 × 980.655 × 10-2 Pa ~ 133.322 Pa (= 1 torr) |
| millimetre of
water (4°C) |
mm H2O |
= 9.806 38 Pa |
|
pounds per square inch |
psi |
~ 6.894 757 × 103 Pa |
|
Electric current, I |
|
ampere (SI
base unit) |
A |
|
|
esu per second (cgs
unit) |
esu.s-1 |
~ ?? A |
|
electromagnetic unit (cgs
unit) |
abamp |
~ ?? A |
|
Electric charge, Q |
|
coulomb (SI
unit) |
C |
= A.s |
|
statcoulomb, electrostatic unit (cgs
unit) |
statC, esu |
~ 3.335 6 × 10-10 C |
|
Voltage, Electromotive force, U |
|
volt (SI
unit) |
V |
= N·m·C-1 |
|
statvolt (cgs
unit) |
statV |
=299.792458 V |
|
Electrical resistance, R |
|
ohm (SI
unit) |
ohm |
= V·A-1 |
|
Energy, U |
|
joule (SI
unit) |
J = N·m |
= kg·m2·s-2 |
|
erg (cgs
unit) |
erg |
= 10-7 J |
|
hartee (au) |
Eh |
~ 4.359 75 × 10-18 J |
|
rydberg |
Ry |
~ 2.179 87 × 10-18 J |
|
electronvolt |
eV |
= e × V ~ 1.602 18 × 10-19 J |
|
calorie, thermochemical |
calth |
= 4.184 J |
| calorie, international |
calIT |
= 4.1868 J |
| 15 °C calorie |
calIT |
~ 4.1855 J |
|
litre atmosphere |
l atm |
= 101.325 J |
|
British thermal unit |
Btu |
≅ 1055.06 J |
|
Board of Trade Unit or kilowatt-hour |
B.O.T.U. or kW·h |
= 3.6 × 106 J |
|
Power, P |
|
watt (SI
unit) |
W |
= J·s-1 = N·m·s-1 = kg·m2·s-3 |
|
horsepower |
hp |
≅ 745.7 W |
| Action,
Angular momentum, L,
J |
|
SI unit |
J·s = N·m·s |
= kg·m2·s-1 |
| cgs unit |
erg·s |
= 10-7 J·s |
|
au of action |
h |
= h/2π
≅ 1.054 57 × 10-34 J·s |
| Dynamic
viscosity, η |
|
SI unit |
Pa·s = N·m-2·s |
= kg·m-1·s-1 |
|
poise |
P |
= 10-1Pa·s |
| centipoise |
cP |
= mPa·s |
| Kinematic
viscosity, ν |
|
SI unit |
m2·s-1 |
|
|
stokes |
St |
= 10-4m2·s-1 |
|
Temperature, T |
|
kelvin (SI
base unit) |
K |
|
| degree
Celsius |
°C |
T[°C] = T[K] - 273.15 |
| degree
Fahrenheit |
°F |
T [°F] = 1.8 (T [°C]) + 32 |
| degree
Rankine |
°R |
= (5/9) K |
Note that lbm is pound mass, not pound meter!
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