CONVERSION FACTORS  Metric to Imperial  and Imperial to Metric. Convert
from a variety of metric and imperial units one to the other, change US Gallons to liters, litres to pints or inches to centimeters. Kilograms and pounds and many more. 
1
centimetre = 10 mm
1 decimetre = 10 cm
1 metre = 100 cm
1 kilometre = 1,000 m
1
foot = 12 inches
1 yard = 3 feet
1 (statute) mile= 1,760 yards
1 int. nautical mile= 1.150779 miles
1 square foot = 144 sq. in.
1 square yard = 9 sq. ft
1 acre = 4,840 sq. yd
1 square mile =
640 acres
1 square metre = 10,000 sq. cm
1 are = 119.6 sq. yards
1 are = 100 square metres
1 hectare = 100 ares = 2.471 acres
1 square kilometre = 100 hectares

From 
To 
Multiply by 
cu inches 

cu centimetres 
16.39 
cu centimetres 

cu inches 
0.06102 
cu
inches: 

cu decimetres 
16.387 
cu feet 

cu metres 
0.02832 
cu metres 

cu feet 
35.315 
cu feet 

cu inches 
1,728 
cu feet 

cu decimetres 
28.316 
cu yards 

cu metres 
0.7646 
cu metres 

cu yards 
1.308 
cu inches 

litres 
0.01639 
litres 

cu inches 
61.03 
1
cubic metre = 1,000,000 cu. cm

From 
To 
Multiply by 
fluid ounce 

litres 
0.0284 
fluid ounce 

cu inches 
1.8047 
US fluid ounce 

litres 
0.0296 
US fluid ounce 

cu inches 
1.878 
gills 

litres 
0.1421 
pint 

cu inches 
34.68 
pints 

litres 
0.568 
litres 

pints 
1.7606 
US pints 

liters 
0.4731 
liters 

US pints 
2.114 
US pints 

cu inches 
28.88 
cu inches 

US pints 
0.0347 
quarts 

litres 
1.136 
US quarts 

liters 
0.9463 
gallons 

litres 
4.546 
US gallons 

litres 
3.785 
peck 

litres 
9.092 
bushel 

liters 
36.4 
US barrels 

cubic metres 
0.159 

1 US pint = 16 fluid oz
1 gill = 5 fluid oz
1 pint = 20 fluid oz
1 quart = 2 pints
1 gallon = 4 quarts
1 peck = 2 gallons
1 bushel = 4 pecks
1 centilitre = 10 ml = 0.018 pint
1 decilitre = 10 cl = 0.176 pint
1 litre = 1000 ml = 1.76 pints
1 litre = 1 cubic decimetres
1 decalitre = 10 l = 2.20 gallons
1 hectolitre = 100 l = 2.75 bushels
1 kilolitre = 1,000 l = 3.44 quarters
The
decalitre is sometimes spelled dekalitre
stones:
kilograms = 6.350
quarters: kilograms = 12.700
centals: kilograms = 45.359
hundredweights: kilograms = 50.802
1
milligram = 0.015 grain
1 centigram = 10 mg = 0.154 grain
1 decigram = 100 mg = 1.543 grains
1 gram = 1000 mg = 15.43 grains
1 decagram = 10 g = 5.64 drams
1 hectogram = 100 g = 3.527 ounces
1 kilogram = 1,000 g = 2.205 pounds
1 tonne (metric ton) = 0.9842 (long) ton= 1,000 kg
the
decagram is sometimes spelled  dekagram
Temperature
Conversion 
F to
C first deduct 32, Multiply by 5 then Divide by 9 
C to
F Multiply by 9, Divide by 5, Add 32 
Illumination 
Lux to Footcandle  Multiply by 0.0929030 
Footcandle to Lux  Multiply by 10.7639 
Energy 
kiloJoules to BTU  Multiply by 0.947817 
BTU to kiloJoules  Multiply by 1.055056 
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Expanded Body Temperature Range
Avoirdupois Weight is
the system of weights used in most
English Speaking countries.
1 dram= 1.772 grams
1 ounce = 16 drams
1 pound = 16 ounces= 7,000 grains
1 stone = 14 pounds
1 hundredweight = 112 pounds (US 100 pounds)
1 short ton= 0.907 tonne = 2,000 pounds
1 (long) ton = 20 hundredweight = 2,240 pounds
Troy Weight (Precious Metals)
24 grains = 1 pennyweight
20 pennyweights = 480 grains = 1 ounce
12 ounces = 5760 = grains = 1 pound
Apothecaries' Weight
20 grains = 1 scruple
3 scruples = 1 dram
8 drams = 1 ounce
12 ounces = 5760 grains = 1 pound
Archaic and less frequently used Linear
Measure
3 hands = 1 foot
1 span = 9 inches
1 rod, pole or perch = 16.5 feet
40 poles = 1 furlong
10 chains* = 1 furlong
8 furlongs = 1 mile
320 rods = 1 mile
3 miles = 1 league
*The Chain; A Chain used to be exactly that, a chain of a standard length.
The acre is equal to ten square
chains  originally measured as an
area of one furlong (furrow long) by one chain wide.
Ancient Measures (2000 years and older)
* Stade = 185 metres
Egyptian Stade = 157 metres
Cubit = 450 mm (based on the most
common
Greek and Egyptian Cubits)
Roman Cubit = 444.5 mm
*The Stade was the distance of an Olympic race
Mithqal  A measure for gold and jewellery, used mainly
in Arab
countries 1 mithqal equals 24 Nakhuds. The Mithqal = 4.25 grams.
10 cables = 1 nautical mile
6080 feet = 1 nautical mile
1 Knot = 1.151 mph
The Nautical Mile: This
defined
as the average distance on the earth's surface corresponding to an angle of 1 minute of arc as measured at the centre of the earth.
A Speed of one
Nautical Miles per hour is known as the Knot.
The International Nautical mile
is accepted by the Royal Navy (1970) as being equal to 1852 metres. As
the earth is not a perfect sphere, but is an oblate spheroid, the distance corresponding
to one minute of arc will vary depending on location. The value of 6080
feet
is a compromise and is the value as measured at some point in the
English
channel.
Depth
6 feet = 1 fathom = 1.8288 metres
15 fathom = 1 shackle
Power
Horsepower  745.7 Watts (SI Units) or 735.5 Watts
(Continental
Europe)
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