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. -

Length and Distance - Area - Volume - Capacity - Mass and Weight - US and Imperial measures  - Velocity - Fuel Consumption - Force - Nautical miles and Knots  - Archaic Measures - Ancient Measures - Apothecaries Weight - Pressure - Torque - Depth - Power - Beaufort Scale

GENERAL CONVERSION FORMULAE
From		To	Multiply by
inches		millimetres	25.4
millimetres		inches	0.0394
inches		centimetres	2.54
centimetres		inches	0.3937
feet		metres	0.3048
metres		feet	3.281
yards		metres	0.9144
metres		yards	1.094
miles		kilometres	1.609
kilometres		miles	0.6214
sq inches		sq centimetres	6.452
sq centimetres		sq inches	0.155
sq metres		sq feet	10.76
sq feet		sq metres	0.0929
sq yards		sq metres	0.8361
sq metres		sq yards	1.196
sq miles		sq kilometres	2.589
sq kilometres		sq miles	0.3861
acres		hectares	0.4047
hectares		acres	2.471
cu inches		cu centimetres	16.39
cu centimetres		cu inches	0.06102
cu feet		cu metres	0.02832
cu metres		cu feet	35.315
cu yards		cu metres	0.7646
cu metres		cu yards	1.308
cu inches		litres	0.01639
litres		cu inches	61.03
pints		litres	0.5682
litres		pints	1.76
US pints		litres	0.47311
litres		US pints	2.114
US gallon		liters	3.785
gallons		litres	4.546
litres		US gallons	0.2642
litres		gallons	0.22
grains		grams	0.0648
grams		grains	15.43
ounces		grams	28.35
grams		ounces	0.03527
pounds		grams	453.6
grams		pounds	0.002205
pounds		kilograms	0.4536
kilograms		pounds	2.205
tons		kilograms	1016.05
kilograms		tons	0.0009842
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LINEAR MEASURE
From		To	Multiply by
inches		millimetres	25.4
millimetres		inches	0.0394
inches		centimetres	2.54
centimetres		inches	0.3937
feet		metres	0.3048
metres		feet	3.281
yards		metres	0.9144
metres		yards	1.094
miles		kilometres	1.609
kilometres		miles	0.6214
nautical miles		kilometres	1.852
nautical miles		miles	1.150779
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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

AREA
From		To	Multiply by
sq inches		sq millimetres	645.16
sq millimetres		sq inches	0.001550
sq inches		sq centimetres	6.452
sq centimetres		sq inches	0.155
sq feet		sq centimetres	929.03
sq centimetres		sq feet	0.001076
sq metres		sq feet	10.76
sq feet		sq metres	0.0929
sq yards		sq metres	0.8361
sq metres		sq yards	1.196
sq miles		sq kilometres	2.5899
sq kilometres		sq miles	0.3861
sq miles		hectares	258.999
hectares		sq miles	0.0038612
sq miles		acres	640
acres		sq miles	0.0015625
acres		sq metres	4046.86
sq metres		acres	0.000247
acres		hectares	0.4047
hectares		acres	2.471
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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

 

VOLUME
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 

CAPACITY
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
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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

MASS and WEIGHT - Commonly used values
From		To	Multiply by
grams		grains	15.43
grains		grams	0.0648
ounces		grams	28.349
grams		ounces	0.03527
pounds		grams	453.59
grams		pounds	0.002205
pounds		kilograms	0.45359
kilograms		pounds	2.205
tons		kilograms	1016.05
kilograms		tons	0.0009842
tons		tonnes	1.016
tonnes		tons	0.9842
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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

FORCE
From		To	Multiply by
kilonewtons		pounds (f)	224.8
pounds (f)		kilonewtons	0.004448
kilonewtons		tons (f)	0.10036
tons (f)		kilonewtons	9.96401
kilonewtons		kilograms (f)	102.0
kilograms (f)		kilonewtons	0.009807
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FUEL CONSUMPTION
From		To	Multiply by
miles/gallon		kilometres/litre	0.3539
kilometres/litre		miles/gallon	2.825
miles/US gallon		kilometers/liter	0.4250
kilometers/liter		miles/US gallon	2.353
gallons/mile		litres/ kilometre	2.825
litres/ kilometre		gallons/mile	0.3540
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American Dry Measurements
From		To	Multiply by
pint		cu. in.	33.60
pint		liter	0.550
quart		liters	1.101
peck (8 quarts)		liters	8.81
bushel (4 pecks)		liters	35.3
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AMERICAN CAPACITY to IMPERIAL CAPACITY
From		To	Multiply by
US fluid ounce		fluid ounce	1.0408
fluid ounce		US fluid ounce	0.9608
US pint		pint	0.8327
pint		US pint	1.201
US gallon		gallon	0.8327
gallon		US gallon	1.201
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VELOCITY
From		To	Multiply by
miles/hour		kilometres/hour	1.609
kilometres/ hour		miles/hour	0.6117
feet/second		metres/second	0.305
metres/second		feet/second	3.279
feet/minute		metres/second	0.00508
metres/ second		feet/minute	196.74
feet/minute		metres/minute	0.305
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PRESSURE
From		To	Multiply by
pounds/in2		kilonewtons/m2	6.895
pounds/in2		Atmosphere	0.0680
pounds/in2		Kilograms/m2	9.80665
Pascal		pounds/in2	14.696
Pascal		feet/second	3.279
Pascal		Kilograms/m2	703.07
Kilograms/m2		pounds/in2	0.001422
Kilograms/m2		Atmosphere	9.68X10-5
Kilograms/m2		Pascal	9.8067
Atmosphere		pounds/in2	14.696
Atmosphere		Pascal	101,325
Atmosphere		Kilograms/m2	10,332
newton/m2		pascal	1.000
kilopascal		kilonewton/m2	1.000
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Torque
From		To	Multiply by
Newton Metres		Foot Pound	0.7376
Newton Metres		Kilogram Force Metres	0.1020
Foot Pounds		Newton Metres	1.356
Foot Pounds		Kilogram Force Metres	0.1383
Kilogram Force Metres		Foot Pound	7.233
Kilogram Force Metres		Newton Metres	9.807
Inch Pound		Foot Pound	12
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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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Click on the thumbnail below for a larger image

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.

 

Nautical miles and Knots

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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