# What Are a Few Construction Formulas?

A few construction formulas can require the math equations for area, volume and the Pythagorean Theorem for the calculation of concrete usage, deck or wall framing and the number of roof shingle squares.The Pythagorean Theorem is one formula used in both carpentry and construction for squaring a wall, notes MyCarpentry.com.

The Pythagorean Theorem, which is for right triangles, states that the hypotenuse C squared is equal to the square root of side A squared and side B squared. For squaring walls, the formula is useful for forming proportions to square large walls. This is because carpenters or builders can use the 3-4-5 rule given by the Pythagorean Theorem, or that 32 + 42 = 52. With the the 3-4-5 rule, a carpenter knows that the proportion 9-12-15 is correct when squaring a larger wall.

Another important construction formula is for calculating the amount of concrete to order for slabs in cubic yards. The formula used for the calculation is (width x length x height)/27 cubic feet. In this formula, the volume is given as (width x length x height) and the 27 cubic feet represents one cubic yard. For this calculation, It is important that the volume is in cubic feet.

Another useful construction formula is the calculation of the numbers of shingles needed for a roof. The formula (length x width)/100 is needed to figure out the number of required square shingles for roofs. The (length x width) portion of this formula is the area formula.

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