I have written (free) online stair and roof calculators you may find useful.
They draw a plan of the stairs and roof, so you can see the layout
Stairs
http://www.blocklayer.com/Stairs/StairsEng.aspx
Roof
http://www.blocklayer.com/Roof/RoofEng.aspx
There is also a dovetail template generator here
http://www.blocklayer.com/Woodjoints/DovetailEng.aspx
Enter the dimensions of the wood, and tail setout and it draws the template, ready to print, fold over end of wood and cut through
And a general wood calculator here
http://www.blocklayer.com/WoodCalcEng.aspx
They draw a plan of the stairs and roof, so you can see the layout
Stairs
http://www.blocklayer.com/Stairs/StairsEng.aspx
Roof
http://www.blocklayer.com/Roof/RoofEng.aspx
There is also a dovetail template generator here
http://www.blocklayer.com/Woodjoints/DovetailEng.aspx
Enter the dimensions of the wood, and tail setout and it draws the template, ready to print, fold over end of wood and cut through
And a general wood calculator here
http://www.blocklayer.com/WoodCalcEng.aspx
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