The surface area of the roof is found by multiplying the number found in Step 3 by the number found in Step 1: $$Surface\,area\,of\,roof = Area\,covered\,by\,roof × Roof\,pitch\,factor = 800 × 1.12 = 896\,square\,feet$$ The formulas we use are the following: For calculations based on the roof rise: rise² + run² rafter length², meaning that: rafter length (rise² + run²). We calculate that a pitch of 6/12 corresponds to the factor 12. Look up the multiplier in the table, or use the method outlined above. (continued) To apply this formula, multiply Rise × Rise, and then Run × Run. This means: $$Area\,covered\,by\,roof = 20 × 40 = 800\,square\,feet$$ Rafter Length: Let the pitch be 4 12and the building width be 20' Step 1. For this example, suppose the roof is 20 ft wide (measured from the roof ridge to the edge of the building) by 40 ft long. Measure the dimensions covered by the roof. $$Surface\,area = Area\,covered\,by\,roof × Roof\,pitch\,factor = 10 × 15 × 1.03 = 150 × 1.03 = 154.5\,square\,feet$$ Step-by-step example using the roof pitch factor table By entering these inputs into the rafter length calculator, you will get a final number. Scale the surface area by the multiplier found in the table: Assume for this example that this distance is 12 feet. You need a formula to scan COL:A that has the list of names. 
Now measure the rise of your roof and assume that rise 1.5 m. Assume that your roof covers a region that is 10 ft by 15 ft and the pitch is 3/12. First, of fall you have to measure the run length. So how do you use the roof pitch multiplier to find the surface area of a roof? The example shows brick veneer construction (see Figure 1) the roof pitch is 20, the rafter run is 3.340 metres.
$$Roof\,pitch\,factor = 1.03$$ How to find the surface area of a roof Calculation of true length of roof members. The roof pitch factor is then the length of the RAFTER divided by the RUN and is given by the following roof pitch factor formula: a 2 + b 2 c 2 As an example, assuming our half span was 2.5m (a) and our rafter length was 3m (b) our formula would look like this: 2.5 2 + 3 2 15.25 Then, we simple square root c 2: 15.25 3. Solving for RAFTER in the above equation gives: Here the RISE and RUN are defined as above, and the RAFTER is the length of the hypotenuse of the triangle with side lengths RISE and RUN.
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