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From Wikipedia

Square inch

A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch. The following symbols are used to denote square inches:

  • square in
  • sq inches, sq inch, sq in
  • inches/-2, inch/-2, in/-2
  • inches^2, inch^2, in^2
  • inches², inch², in²

The square inch is a common unit of measurement in the United States and the United Kingdom.

Equivalence with other units of area

1 square inch (assuming an international inch) is equal to: (the overbars indicate repeating decimals)

From Yahoo Answers

Question:Got a spec for a guitar neck 1.8 inches wide -- what is .8 of an inch? In 8th's or 16ths or some normal inch measurement. Or what is 1.8 inches in metric measurement? 8 tenths of an inch makes no sense to me....thanks for your help:)

Answers:If we work with fraction and decimals at the same time we always are in trouble so lets get a common denominator that is useful..... there are 1.6 sixteenths in a tenth of an inch in an inch there are small increments of 1/16Th inch each one is equal to .0625 " in its decimal equivalent. so 1.8 inches is 1 whole inch and .8/.0625=12.8..16Th's now we both know that .8... 16Th's is a rather hard unit to calculate but in our decimal world lets go one more step 1/32=.03125 1/64=.015625 1/128 =.0078125=102.4 128Th's =102/128=51/64=about 13/16 wiTh a rounded remainder whew!!!!! Well we are right back were we started....at 12.8 16ths so in a decimal world .8 and 1/16th is a pretty weird conversion right... now lets look at metric because both use 10 as the root.. 2.54 cm =1 in so 1.8" =2.54 * 1.8=4.572cm this is a lot easier for me anyway...but in building things like furniture or guitar necks or some other object were creativity is involved the fractional mis-calculation you might have at the 1/128thinch level is not worth your time. Most Luthiers use a template and forms that are only good to 1/32 " and worry about the "feel & fit " more than the actual measurement.... in 8tenths of an inch there are 12.8 sixteenths use 12.5 and you have 25/32 use 13/16 and sand it down to fit...Your choice ....Well there you go from the E.....

Question:I have US-made blueprints using the inch measurements system. My mill use metric system (wheels are calibrated in millimeters). Using the commonly used conversion value (1 inch = 25,4 millimeters), will my parts be compatible with the inch-built version ? thanks !

Answers:1 inch = 25,4 mm is not only the "commonly used" conversion, it is the EXACT conversion. Also important is the tolerances on the parts you are making. If the blueprints specify +/- 0,001 inch tolerances, and you use +/- 0,1 mm, the parts are not going to fit. As for the pre-1959 inch, I would be surprised if your application cares about the difference between 25,4 mm and 25,400 051 mm. As I am sure you know, the U.S. convention is to use the period to separate the whole and decimal parts of the numbers. European convention is the use the comma.

Question:an inch in centimetres is 2.54 cm i need the next 4 numbers after the .54

Answers:That is exact, actually.

Question:Does a P205/50R/16" tire have the same circumference as a P195/60R/15; tire. Involves how many miters are in one inch. Approximately 24.5 or 25.4 Which is correct. rince as a P195/60R/15" tire ?.

Answers:25.4 exactly. your 195/60 r15 is 7.68" wide, with a 24.21"diameter. thats theoretically what it is, but the actual tire could vary greatly.

From Youtube

Math Lessons : How to Convert Inches Into a Fraction :When converting inches into fractions, it helps to remember that inches are closely related to feet. Convert 42 inches to 3 1/2 feet with help from a math teacher in this free video on basic math lessons. Expert: Jimmy Chang Bio: Jimmy Chang has been a math teacher at St. Pete College for nearly a decade. He has a master's degree in math, and his specialties include calculus, algebra, liberal arts, math and trigonometry. Filmmaker: Christopher Rokosz