SI Units and Conversion Factors
Length
SI Base Unit = meter (m)
1.00 inch (in) = 2.54 centimeters (cm)
1.00 meter (m) = 1.09 yards (yds)
100 centimeters
1.00 kilometer (km) = 1000 meters
0.621 mile
1.00 mile (mi) = 5280 feet (ft)
1.61 kilometers
1.00 angstrom (Å)= 1.00 x 10-10 meter
100 picometers (pm)
Mass
SI Base Unit = gram (g)
1.00 kilogram (kg) = 1000 grams (g)
2.20 pounds (lbs)
1.00 pound (lb) = 454 grams
0.454 kilogram
16.0 ounces (oz)
1.00 ton (t) = 2000 pounds
907 kilograms
1.00 metric ton (mt)= 1000 kilograms
2205 pounds
1.00 amu = 1.66 x 10-27 kg
amu = atomic mass unit
Volume
SI Base Unit = Liter (L)
1.00 liter (L) = 0.00100 m3
1.00 dm3
1.06 quarts (qt)
1000 milliliters (mL)
1.00 milliliter = 1.00 cubic centimeter
1.00 gallon (gal) = 4.00 quarts
8.00 pints (pt)
3.79 liters
1.00 quart (qt) = 32.0 fluid ounces (fl.oz)
0.946 liter
Temperature
SI Unit = kelvin (K)
Absolute zero (0 K) =
-273.15 C
-459.67 F
Temperature Conversions:
C + 273 = K
K – 273 = C
(F – 32)/1.8 = C
1.8(C) + 32 = F
Energy
SI Base Unit = joule (J)
1.00 joule (J) = 1.00 kg • m2/s2
0.239 calorie (cal)
9.48 x 10-4 btu
1.00 calorie (cal) = 4.18 joules
3.97 x 10-3 btu
1.00 btu = 1060 joules
252 calories
btu = British thermal unit
Pressure
SI Base Unit = pascal (Pa)
1.00 pascal (Pa) = 1.00 N/m2
1.00 kg/m • s2
1.0 atmosphere (atm)= 101 kilopascals (kPa)
760. torr (mm Hg)
14.7 lbs per sq in (psi)
1.00 bar = 1.00 x 105 pascals
Number/Amount
SI Base Unit = mole (mol)
1.00 mole (mol) = 6.02 x 1023
1.00 dozen (doz) = 12
1.00 gross = 144
12 dozen
SI Units and Conversion Factors
Metric System Prefixes
Factor
1024
1021
1018
1015
1012
109
106
103
102
101
10-1
10-2
10-3
10-6
10-9
10-12
10-15
10-18
10-21
10-24
Prefix
yotta
zetta
exa
peta
tera
giga
mega
kilo
hecto
deka
Base Unit
deci
centi
milli
micro
nano
pico
femto
atto
zepto
yocto
Symbol
Y
Z
E
P
T
G
M
k
h
da
d
c
m
u
n
p
f
a
z
y
Metric System Base Units
Dimension
Length (distance)
Mass
Volume
Energy
Pressure
Time
Base Unit
meter
gram
liter
joule
Pascal
second