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Conversion From U.S. Customary to Metric units
| When You Know |
Multiply By |
To Find |
| inches |
25.4 |
millimeters |
| |
2.54 |
centimeters |
| feet |
30.48 |
centimeters |
| yards |
0.91 |
meters |
| miles |
1.61 |
kilometers |
| teaspoons |
4.93 |
milliliters |
| tablespoons |
14.79 |
milliliters |
| fluid ounces |
29.57 |
milliliters |
| cups |
0.24 |
liters |
| pints |
0.47 |
liters |
| quarts |
0.95 |
liters |
| gallons |
3.79 |
liters |
| cubic feet |
0.028 |
cubic meters |
| cubic yards |
0.76 |
cubic meters |
| ounces |
28.35 |
grams |
| pounds |
0.45 |
kilograms |
| short tons (2,000 lbs) |
0.91 |
metric tons |
| square inches |
6.45 |
square centimeters |
| square feet |
0.09 |
square meters |
| square yards |
0.84 |
square meters |
| square miles |
2.60 |
square kilometers |
| acres |
0.40 |
hectacres |
From Metric to U.S. Customary Units
| When You Know |
Multiply By |
To Find |
| millimeters |
0.04 |
inches |
| centimeters |
0.39 |
inches |
| meters |
3.28 |
feet |
| |
1.09 |
yards |
| kilometers |
0.62 |
miles |
| milliliters |
0.20 |
teaspoons |
| |
0.06 |
tablespoons |
| |
0.03 |
fluid ounces |
| liters |
1.06 |
quarts |
| |
0.26 |
gallons |
| |
4.23 |
cups |
| |
2.12 |
pints |
| cubic meters |
35.32 |
cubic feet |
| |
1.35 |
cubic yards |
| grams |
0.035 |
ounces |
| kilograms |
2.21 |
pounds |
| metric ton (1,000 kg) |
1.10 |
short ton |
| square centimeters |
0.16 |
square inches |
| square meters |
1.20 |
square yards |
| square kilometers |
0.39 |
square miles |
| hectacres |
2.47 |
acres |
Temperature Conversion Between Celsius and
Fahrenheit
°C = (°F - 32) ÷ 1.8
°F = (°C x 1.8) + 32
| Condition |
Fahrenheit |
Celsius |
| Boiling point of water |
212° |
100° |
| A very hot day |
104° |
40° |
| Normal body temperature |
98.6° |
37° |
| A warm day |
86° |
30° |
| A mild day |
68° |
20° |
| A cool day |
50° |
10° |
| Freezing point of water |
32° |
0° |
| Lowest temperature Gabriel
Fahrenheit could obtain by mixing salt and ice |
0° |
-17.8° |
U.S. Customary System: Length
| Unit |
Relation to Other U.S.
Customary Units |
Metric Equivalent |
| inch |
1/12 foot |
2.54 centimeters |
| foot |
12 inches or 1/3 yard |
0.3048 meter |
| yard |
36 inches or 3 feet |
0.9144 meter |
| rod |
16 1/2 feet or 5 1/2 yards |
5.0292 meters |
| furlong |
220 yards or 1/8 mile |
0.2012 kilometer |
| mile (statute) |
5,280 feet or 1,760 yards |
1.6093 kilometers |
| mile (nautical) |
2,025 yards |
1.852 kilometers |
U.S. Customary System: Volume or Capacity (Liquid
Measure)
| Unit |
Relation to Other U.S.
Customary Units |
Metric Equivalent |
| ounce |
1/16 pint |
29.574 milliliters |
| gill |
4 ounces |
0.1183 liter |
| pint |
16 ounces |
0.4732 liter |
| quart |
2 pints or 1/4 gallon |
0.9463 liter |
| gallon |
128 ounces or 8 pints |
3.7853 liters |
| barrel |
|
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| (wine) |
31 1/2 gallons |
119.24 liters |
| (beer) |
36 gallons |
136.27 liters |
| (oil) |
42 gallons |
158.98 liters |
U.S. Customary System: Volume or Capacity (Dry
Measure)
| Unit |
Relation to Other U.S.
Customary Units |
Metric Equivalent |
| pint |
1/2 quart |
0.5506 liter |
| quart |
2 pints |
1.1012 liters |
| peck |
8 quarts or 1/4 bushel |
8.8098 liters |
| bucket |
2 pecks |
17.620 liters |
| bushel |
2 buckets or 4 pecks |
35.239 liters |
U.S. Customary System: Weight
| Unit |
Relation to Other U.S.
Customary Units |
Metric Equivalent |
| grain |
1/7000 pound |
64.799 milligrams |
| dram |
1/16 ounce |
1.7718 grams |
| ounce |
16 drams |
28.350 grams |
| pound |
16 ounces |
453.6 grams |
| ton (short) |
2,000 pounds |
907.18 kilograms |
| ton (long) |
2,240 pounds |
1,016.0 kilograms |
U.S. Customary System: Geographic Area
| Unit |
Relation to Other U.S.
Customary Units |
Metric Equivalent |
| acre |
4,840 square yards |
4,047 square meters |
Cooking Measures
| Unit |
Relation to Other Cooking
Measures |
Conversion to Metric Units |
| drop |
1/76 teaspoon |
0.0649 milliliter |
| teaspoon |
76 drops or 1/3 tablespoon |
4.9288 milliliters |
| tablespoon |
3 teaspoons |
14.786 milliliters |
| cup |
16 tablespoons or 1/2 pint |
0.2366 liter |
| pint |
2 cups |
0.4732 |
| quart |
4 cups or 2 pints |
0.9463 |
British Imperial System: Volume or Capacity (Liquid
Measure)
| Unit |
Relation to Other British
Imperial Units |
Conversion to U.S. Customary
Units |
Conversion to Metric Units |
| pint |
1/2 quart |
1.201 pints |
0.5683 liter |
| quart |
2 pints or 1/4 gallon |
1.201 quarts |
1.137 liters |
| gallon |
8 pints or 4 quarts |
1.201 gallons |
4.546 liters |
British Imperial System: Volume or Capacity (Dry
Measure)
| Unit |
Relation to Other British
Imperial Units |
Conversion to U.S. Customary
Units |
Conversion to Metric Units |
| peck |
1/4 bushel |
1.0314 pecks |
9.087 liters |
| bushel |
4 pecks |
1.0320 bushels |
36.369 liters |
Apothecary Weights
| Unit |
Relation to Other Apothecary
Units |
Conversion to U.S. Customary
Units |
Conversion to Metric Units |
| grain |
160 dram or 1/5760 pound |
equal to the U.S. Customary
grain |
64.799 milligrams |
| dram |
60 grains or 1/8 ounce |
2.1943 drams |
3.8879 grams |
| ounce |
8 drams |
1.0971 ounces |
31.1035 grams |
| pound |
12 ounces or 96 drams |
0.8232 pound |
373.242 grams |
Units of the International System
The International System (abbreviated SI, for
Systeme International, the French name for the system) was
adopted in 1960 by the 11th General Conference on Weights
and Measures. An expanded and modified version of the metric
system, International System addresses the needs of modern
science for additional and more accurate units of
measurement. The key features of the International System
are decimalization, a system of prefixes, and a standard
defined in terms of an invariable physical measure.
Base Units
The International System has base units from which
all others in the system are derived. The standards for
the base units, except for the kilogram, are defined by
unchanging and reproducible physical occurences. For
example, the meter is defined as the distance traveled
by light in a vacuum in 1/299,792,458 of a second. The
standard for the kilogram is a platinum-iridium cylinder
kept at the International Bureau of Weights and
Standards in Sèvres, France.
| Unit |
Quantity |
Symbol |
| meter |
length |
m |
| kilogram |
mass |
kg |
| second |
time |
s |
| ampere |
electric current |
A |
| kelvin |
temperature |
K |
| mole |
amount of matter |
mol |
| candela |
luminous intensity |
cd |
Supplementary Units
The International System uses two supplementary units
that are based on abstract geometrical concepts rather
than physical standards.
| Unit |
Quantity |
Symbol |
| radian |
plane angles |
rad |
| steradian |
solid angles |
sr |
Prefixes
A multiple of a unit in the International System is
formed by adding a prefix to the name of that unit. The
prefixes change the magnitude of the unit by orders of
ten from 1024 to 10-24.
| Prefix |
Symbol |
Multiplying Factor |
| yotta- |
Y |
1024 =
1,000,000,000,000,000,000,000,000 |
| zetta- |
Z |
1021 =
1,000,000,000,000,000,000,000 |
| exa- |
E |
1018 =
1,000,000,000,000,000,000 |
| peta- |
P |
1015 =
1,000,000,000,000,000 |
| tera- |
T |
1012 =
1,000,000,000,000 |
| giga- |
G |
109 = 1,000,000,000 |
| mega- |
M |
106 = 1,000,000 |
| kilo- |
K |
103 = 1,000 |
| hecto- |
h |
102 = 1000 |
| deca- |
da |
10 = 10 |
| deci- |
d |
10-1 = 0.1 |
| centi- |
c |
10-2 = 0.01 |
| milli- |
m |
10-3 = 0.001 |
| micro- |
|
10-6 = 0.000,001 |
| nano- |
n |
10-9 = 0.000,000,001 |
| pico- |
p |
10-12 =
0.000,000,000,001 |
| femto- |
f |
10-15 =
0.000,000,000,000,001 |
| atto- |
a |
10-18 =
0.000,000,000,000,000,001 |
| zepto- |
z |
10-21 =
0.000,000,000,000,000,000,001 |
| yocto- |
y |
10-24 =
0.000,000,000,000,000,000,000,001 |
Additional Units
Listed below are a few of the non-SI units that are
commonly used with the International System.
| Unit |
Quantity |
Symbol |
| angstrom (= 10-10m)
|
length |
Å |
| electron-volt (= 0.160 aJ)
|
energy |
eV |
| hectare (= 10,000 m2)
|
land area |
ha |
| liter (= 1.0dm3) |
volume or capacity |
l |
| standard atmosphere (= 101.3
kPa) |
pressure |
atm |
Derived Units
Most of the units in the International System are
derived units, that is units defined in terms of base
units and supplementary units. Derived units can be
divided into two groups - those that have a special name
and symbol, and those that do not.
| Without Names
and Symbols |
| Measure of |
Derivation |
| acceleration |
m/s2 |
| angular acceleration |
rad/s2 |
| angular velocity |
rad/s |
| density |
kg/m3 |
| electric field strength |
V/m |
| luminance |
cd/m2 |
| magnetic field strength |
A/m |
| velocity |
m/s |
| With Names and
Symbols |
| Unit |
Measure of |
Symbol |
Derivation |
| coulomb |
electric charge |
C |
A·s |
| farad |
electric capacitance |
F |
A·s/V |
| henry |
inductance |
H |
V·s/A |
| hertz |
frequency |
Hz |
cycles/s |
| joule |
quantity of energy |
J |
N·m |
| lumen |
flux of light |
lm |
cd·sr |
| lux |
illumination |
lx |
lm/m2 |
| newton |
force |
N |
kg·m/s2 |
| ohm |
electric resistance |
|
V/A |
| pascal |
pressure |
Pa |
N/m2 |
| tesla |
magnetic flux density |
T |
Wb/m2 |
| volt |
voltage |
V |
W/A |
| watt |
power |
W |
J/s |
| weber |
magnetic flux |
Wb |
V·s |
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