Roof Slope Conversion Chart

Then you ll be able to measure slope from an unfinished attic space under the roof.

Roof slope conversion chart.

Given that roofs are normally spotted from a distance long before any windows and doors they will be a large determining factor as to what someone will think of when they look at your property. For many home owners the roof is a hugely important feature of the home and is the key section of the home which is seen from the exterior. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Rafter rise run this formula is from the pythagorean theorem.

To do this simply convert the rise and run as a fraction to a decimal form eg. First convert the pitch to a slope. Use the following formula which also describes a right triangle. To obtain an accurate roof pitch measurement properly measure the rise and run.

Here are the equations you may use to solve for the length of the slope and the rafter. If you re not sure what the slope of your roof is and you want to determine that in either degrees or rise in run we recommend this slope finder on amazon. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Rise run rise run slope.

You can also calculate roof pitch even without using a roof slope calculator. It s very inexpensive and very accurate. To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. Giving you a slope of 8 556 in 12 or.