Approximate conversion of units

Approximate conversion of units

Approximate conversion of units often needs to be done without calculator, computer, or sometimes even longhand. This article is an informal listing of some simple conversions between (and within) the imperial system, the U.S. customary system and the metric system/SI. When people say "a foot long" or "ten kilometres from here", they rarely mean "0.3048 m" or "6.21571 miles".

These are all rough approximations; for more accurate information, see Conversion of units.

Exact conversions can be performed in Google by typing the source and target units directly in the search box, using the keyword "in".

For example; On entering
34 acres in hectares
in Google search box there is returned:
34 acres = 13.7593118 hectares.
The user should be conscious of the significant figures in the result generated.

Length

English units to metric units

Area

English units to metric units

U.S. customary to metric and Imperial units

Kitchen

Metric units to Avoirdupois

Force

Power

Temperature

Fahrenheit to Celsius -- subtract 32, divide by 1.8
Examples:
*212 - 32 = 180; 180 /1.8 = 100 Water Boils in Degrees Celsius
*98.6 - 32 = 66.6; 66.6 / 1.8 = 37 Normal Human Body Temperature in Degrees Celsius
*68 - 32 = 36; 36 / 1.8 = 20 Comfortable temperature in Degrees Celsius
*32 - 32 = 0; 0/1.8 = 0 Water Freezes in Degrees Celsius
*-40 - 32 = -72; -72 /1.8 = -40 Only Temperature the Same in Celsius and Fahrenheit

Celsius to Fahrenheit -- multiply by 1.8, add 32
Examples:
*100 x 1.8 = 180; 180 + 32 = 212 Water Boils in Degrees Fahrenheit
*37 x 1.8 = 66.6; 66.6 + 32 = 98.6 Normal Human Body Temperature in Degrees Fahrenheit
*20 * 1.8 = 36; 36 + 32 = 68 Comfortable temperature in Degrees Fahrenheit
*0 x 1.8 = 0; 0 + 32 = 32 Water Freezes in Degrees Fahrenheit
*-40 x 1.8 = -72; -72 + 32 = -40 Only Temperature the Same in Celsius and Fahrenheit

References


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