Measurement conversion factors to convert US and UK measurements to SI ( metric )





 

 
 

Measurement Conversion Factors

 

To convert into x = multiply
/ = divide
acres hectares x 0.4047
acres sq. kilometres / 247
acres sq. metres x 4047
acres sq. miles / 640 
barrels (oil) cu.metres / 6.29
barrels (oil) gallons (GB) x 34.97
barrels (oil) gallons (USA) x 42 
barrels (oil) litres/(ers) x 159
centimetres feet / 30.48 
centimetres inches / 2.54 
centimetres metres / 100 
centimetres millimetres x 10 
cubic cm cubic inches x 0.06102
cubic cm litres/(ers) / 1000 
cubic cm millilitres/(ers) x 1 
cubic feet cubic inches x 1728 
cubic feet cubic metres x 0.0283
cubic feet cubic yards / 27 
cubic feet gallons (GB) x 6.229
cubic feet gallons (USA) x 7.481
cubic feet litres/(ers) x 28.32
cubic inches cubic cm x 16.39
cubic inches litres/(ers) x 0.01639
cubic metres cubic feet x 35.31
feet centimetres x 30.48 
feet metres x 0.3048 
feet yards / 3 
fl.ounces (GB) fl.ounces (USA) x 0.961
fl.ounces (GB) millilitres/(ers) x 28.41
fl.ounces (USA) fl.ounces (GB) x 1.041
fl.ounces (USA) millilitres/(ers) x 29.57
gallons pints x 8 
gallons (GB) cubic feet x 0.1605
gallons (GB) gallons (USA) x 1.2009
gallons (GB) litres/(ers) x 4.54609 
gallons (USA) cubic feet x 0.1337
gallons (USA) gallons (GB) x 0.8327
gallons (USA) litres/(ers) x 3.785
grams kilograms / 1000 
grams ounces / 28.35
hectares acres x 2.471
hectares square km / 100 
hectares square metres x 10000 
hectares square miles / 259
hectares square yards x 11 960
inches centimetres x 2.54 
inches feet / 12 
kilograms ounces x 35.3
kilograms pounds x 2.2046
kilograms tonnes / 1000 
kilograms tons (GB) / 1016
kilograms tons (USA) / 907
kilometres metres x 1000 
kilometres miles x 0.6214
litres/(ers) cu.inches x 61.02
litres/(ers) gallons (GB) x 0.2200
litres/(ers) gallons (USA) x 0.2642
litres/(ers) pints (GB) x 1.760
litres/(ers) pints (US liquid) x 2.113
litres/(ers)/100km MPG (GB) 282.5/ l/100km
litres/(ers)/100km MPG (USA) 235.2/ l/100km
metres yards / 0.9144 
metres centimetres x 100 
miles kilometres x 1.609 
miler per gallon (GB) litres/(ers)/100km 282.5 / MPG
miler per gallon (USA) litres/(ers)/100km 235.2 / MPG
miles per hour km/h mph x 1.609
km/h metres/second km/h x 0.278
km/h mph km/h x 0.621
m/sec km/h m/sec x 3.6
millimetres inches / 25.4 
ounces grams x 28.35
pints (GB) litres/(ers) x 0.5683
pints (GB) pints (US liquid) x 1.201
pints (US liquid) litres/(ers) x 0.4732
pints (US liquid) pints (GB) x 0.8327
pounds kilograms x 0.4536
pounds ounces x 16 
square cm sq. inches x 0.1550
square feet sq. inches x 144 
square feet sq. metres x 0.0929
square inches square cm x 6.4516 
square inches square feet / 144 
square km acres x 247
square km hectares x 100 
square km square miles x 0.3861
square metres acres / 4047
square metres hectares / 10 000 
square metres square feet x10.76
square metres square yards x 1.196
square miles acres x 640 
square miles hectares x 259
square miles square km x 2.590
square yards square metres /1.196
tonnes kilograms x 1000 
tonnes tons (GB) x 0.9842
tonnes tons (USA) x 1.1023
tons (GB) kilograms x 1016
tons (GB) tonnes x 1.016
tons (USA) kilograms x 907.2
tons (USA) tonnes x 0.9072
yards metres x 0.9144 

* = multiply   / = divide

SI Prefixes
 

Factor Name Prefix
 
Factor Name Prefix
1024 yotta Y
1021 zetta Z
1018 exa E
1015 peta P
1012 tera T
109 giga G
106 mega M
103 kilo k
102 hecto h
101 deca da
 
10–1 deci d
10–2 centi c
10–3 milli m
10–6 micro µ
10–9 nano n
10–12 pico p
10–15 femto f
10–18 atto a
10–21 zepto z
10–24 yocto y


Example:

1,000  [103] metres = 1km

1,000,000  [106]  watts = 1Mw

1/1000 of a gramme (milligram) [10–3] = 1mg   

Note that only the higher value prefixes (above kilo) use upper case letters.

 

Note: While many of the conversion factors above are exact, some involve rounding. The table is intended for domestic rather than scientific use.

 

Links:

Bureau International des Poids et Mesures

 

 

Temperatures

Fahrenheit (F) to Celsius (C) 

   
      Start with (F);   subtract 32;   multiply by 5;   divide by 9;   the answer is (C)
Celsius (C) to Fahrenheit (F) 
      Start with (C);   multiply by 9;   divide by 5;   add on 32;   the answer is (F)  
Approximate Equivalents:
30 C

86 F
20 C

68 F
10 C

50 F
0 C

32 F

 

 

  

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