Roof Estimating Formulas

Roof pitch roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

Roof estimating formulas.

L 30 feet h 12 feet 30 12 2 180 square feet. To get the slope of your roof based on degrees roof rise or x inches per 12 run use our roof pitch calculator. However if you use premium materials such as metal wood shingles clay tile etc the cost of your roof will be at least 9 500 16 000. You can also calculate roof pitch even without using a roof slope calculator.

Medium low slope roof pitch of 3 or 4. Here are the equations you may use to solve for the length of the slope and the rafter. To accurately calculate the area of your roof you must first determine its slope or pitch. Ranch house using asphalt roof shingles.

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. Use the following formula which also describes a right triangle. The average roof replacement cost is 4 200 6 600 on a 1 600 sq ft. Steep slope roof pitch of 12 or 45 degrees.

1 roof square 100 square feet. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Medium steep slope roof pitch of 9. Roofing cost can vary widely depending on the size and complexity of your roof type of materials you use as well as your location.

The length l times the height h of a triangle is twice its area a2. Rafter rise run this formula is from the pythagorean theorem. So if you divide your answer of a product of length times height by two you will get the area of a triangle. Otherwise use the table or diagram below.