Roof Slope Ratio Calculator

A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof pitch in degrees charts you see will be working to this ratio at the very least.

Roof slope ratio calculator.

This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. This will give you the rise over run or pitch. First convert the pitch to a slope. 1 as a ratio of the rise to the run for example 1 in 20 2 as an angle almost always in degrees 3 as a percentage called the grade which is the rise run 100.

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. The rise is the height of the roof and the run is the horizontal span as pictured above. The roof pitch is the slope of the rafter. Rise run rise run slope.

The pitch is commonly defined as the ratio of rise over run in the form of x 12. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. For example if a roof has a pitch of 4 12 then for every 12 inches the building extends horizontally it rises 4 inches. 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.

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. To do this simply convert the rise and run as a fraction to a decimal form eg. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

For example if you measure 4 inches the pitch of your roof is 4 12. Slope tilt or inclination can be expressed in three ways. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. It is often compared to slope but is not exactly the same.

With a 12 in 12 slope the wall or roof rises 12 inches in a 12 inch run a 12 in 12 slope 45 one could be inclined to assume that a 6 in 12 slope would equal half of that 22 5.