C SI Units and Conversions
Below is a table of conversion factors (source). Bold values indicate exact conversion values. Units in the first column are generally not used in NIST publications except those that are italicized.
| Convert from | to | Multiply by | ||
|---|---|---|---|---|
ångström |
Å |
nanometer |
nm |
1.0E-01 |
astronomical unit |
au |
meter |
m |
1.495979E+11 |
atmosphere, standard |
atm |
pascal |
Pa |
1.01325E+05 |
bar |
bar |
pascal |
Pa |
1.0E+05 |
cubic inch |
in3 |
cubic meter |
m3 |
1.638706E-05 |
cubic yard |
yd3 |
cubic meter |
m3 |
7.645549E-01 |
cup (US) |
milliliter |
mL |
2.365882E+02 | |
day |
d |
second |
s |
8.64E+04 |
degree (angle) |
° |
radian |
rad |
1.745329E-02 |
electronvolt |
eV |
joule |
J |
1.602177E-19 |
fluid ounce (US) |
fl oz |
milliliter |
mL |
2.957353E+01 |
foot |
ft |
meter |
m |
3.048E-01 |
gallon (US) |
gal |
liter |
L |
3.785412 |
hour |
h |
second |
s |
3.6E+03 |
inch |
in |
centimeter |
cm |
2.54 |
kelvin |
K |
degree Celsius |
°C |
t/°C = T/K - 273.15 |
kilocalorieth |
kcalth |
kilojoule |
kJ |
4.184 |
knot (nautical mile per hour) |
meter per second |
m/s |
5.144444E-01 | |
liter |
L |
cubic meter |
m3 |
1.0E-03 |
micron |
µ |
meter |
m |
1.0E-06 |
mile |
mi |
kilometer |
km |
1.609344 |
mile per gallon (US) |
mpg, mi/gal |
kilometer per liter |
km/L |
4.251435E-01 |
mile per hour |
mi/h |
kilometer per hour |
km/h |
1.609344 |
mile, nautical |
meter |
m |
1.852E+03 | |
millimeter of mercury |
mmhg |
pascal |
pa |
1.333224E+02 |
millimeter of water |
mmH2O |
pascal |
pa |
9.80665 |
minute |
min |
second |
s |
6.0E+01 |
ounce (avoirdupois) |
oz |
kg |
g |
2.834952E-02 |
parsec |
pc |
meter |
m |
3.085678E+16 |
peck (US) |
pk |
liter |
L |
8.809768 |
pint (US liquid) |
liq pt |
liter |
L |
4.731765E-01 |
pound (avoirdupois) |
lb |
kilogram |
kg |
4.535924E-01 |
pound-force per square inch |
psi; lbf/in2 |
pascal |
Pa |
6.894757E+03 |
quart (US liquid) |
liq qt |
liter |
L |
1.101221 |
tablespoon |
milliliter |
mL |
1.478676E+01 | |
teaspoon |
milliliter |
mL |
4.928922 | |
ton, short (2000 lb) |
kilogram |
kg |
9.071847E+02 | |
torr |
Torr |
pascal |
Pa |
1.333224E+02 |
yard |
yd3 |
meter |
m |
9.144E-01 |
degree Fahrenheit (temperature) |
°F |
degree Celsius |
°C |
t/°C = (t/°F - 32)/1.8 |
degree Fahrenheit (temperature) |
°F |
kelvin |
K |
T/K = (t/°F + 459.67)/1.8 |
degree Celsius (temperature) |
°C |
kelvin |
K |
T/K = t/°C + 273.15 |
degree Celsius (temperature) |
°C |
degree Fahrenheit (temperature) |
°F |
t/°F = (t/C × 1.8) + 32 |