Roof Slope Conversion Chart

Rafter rise run this formula is from the pythagorean theorem.

Roof slope conversion chart.

Then you ll be able to measure slope from an unfinished attic space under the roof. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. 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.

You can also calculate roof pitch even without using a roof slope calculator. Use the following formula which also describes a right triangle. Here are the equations you may use to solve for the length of the slope and the rafter. First convert the pitch to a slope.

Approximately 8 9 16 in 12. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. To obtain an accurate roof pitch measurement properly measure the rise and run. Giving you a slope of 8 556 in 12 or.

Rise run rise run slope. 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. To do this simply convert the rise and run as a fraction to a decimal form eg. 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.