Roof Slope Conversion Chart

You can also calculate roof pitch even without using a roof slope calculator.

Roof slope conversion chart.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. Here are the equations you may use to solve for the length of the slope and the rafter. Rise run rise run slope. Rafter rise run this formula is from the pythagorean theorem.

0 713 x 12 8 556. To obtain an accurate roof pitch measurement properly measure the rise and run. 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. First convert the pitch to a slope.

It s very inexpensive and very accurate. Approximately 8 9 16 in 12. Use the following formula which also describes a right triangle. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Then you ll be able to measure slope from an unfinished attic space under the roof. 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. Giving you a slope of 8 556 in 12 or.