Stan,
The cost of roofing materials has significantly increased and the best price I am getting is $180 per square (a 10' X 10' section of the roof is a square). For the typical 5/12 pitch I use this formula;
Total Square Feet of House times 1.3 (pitch variable) divided by 100 (a square) times $180 (cost per square). Using 1,500 square feet as an example;
1,500 X 1.3= 1,950 / 100= 19.5 X 180= $3,510
This serves as a good estimate for the purpose of an offer. Once the offer is accepted I request a quote from my contractor. Keep in mind variations in the pitch will affect the price.
If anyone is getting a better price or has a better formula, please share.
Dan