![]() ![]() (If you already know the conversion of inches to a decimal, you may just enter it as feet. If you are uncertain as to the conversion, you may use our conversion tables for precision up to 64ths of an inch in decimal. Keep in mind that this is a decimal fraction for example. If you have a fraction of an inch, you may enter it. In the feet and inches mode (American system), enter your value of feet indicated as Feet, then the inches, if there are any, in the box indicated as Inches. Select the American or Metric number system first. This calculator is capable of use in the American system of feet and inches, and the metric system of meters. A little extra effort in the initial stages yields a much more professional structure in the end. (If you don't want to actually measure but can determine by a sting, both diagonals must be equal for a squared foundation.) Just a fraction of a degree deviation from 90 degrees, over 20 feet or more, is a substantial error in causing walls to not be straight or square. While protractors and T-Squares are very useful, the longer the distance for the measurement, the more accurate it is. ![]() Verification is true in that 9 plus 16 is 25, of which the square root is 5. It is also known in the construction industry as 3-4-5, meaning the if the length is 3 (squared = 9) and the width is 4 (squared = 16) then the diagonal is 5 (squared = 25). Reduced to simple construction terms, it says that the foundation length squared plus the foundation width squared equals the foundation diagonal distance (opposite corner to opposite corner) squared. (Be square or Repair.) The calculation is based on the Pythagorean Theorem. ![]() This calculator is designed to give the result of a math calculation to verify that a foundation (or room, truss foundation, or other 90 degree structure) is actually square and correct in layout. This calculator requires the use of Javascript enabled and capable browsers. ![]()
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