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Thanks Everyone, I do remodel projects and run into some oddball pitches so I use a Stabilla electronic level which give me the degrees. I've used the speed square to convert to pitch, but if the roof is an oddball, I need to guess at the pitch (sometimes I need to hit an existing height). I use the step-off method to layout rafters.
Barry, if you are given only the measurement in degrees, since the tangent of an angle is the rise/run you can use this series to solve for Tangent of an Angle.
Be sure you multiply the value of the angle (x in the formula) in degrees by pi/180 to convert it to radians before substituting.
It's a good formula to know if you don't have a calculator but keep a box of pencils and a ream of paper handy ...
Originally posted by Barry Dennis
Does anyone know the math formula to convert the angle of a roof in degrees to X in 12 pitch?
EDIT: You asked for the "Over 12" value, so after you are done cyphering multiply the result returned by the tangent formula by 12.
Call me Old School, but why not just use a square to begin with? if the slope is 5 3/16 on 11 who cares, measure the run off your square and make pitch blocks to set your saws if need be. It doesn't need batteries and it is always right.