Take a carpenter’s square and mark the first rise and run by laying
out the square so that the 7 ¼” and 10” points coincide with the edge of
the stringer as in this picture.
Now extend the line of the tread all across the stringer as depicted in this picture.
Finally, extend the line of the rise all the way down to the underside of the stringer as depicted in this picture.
Now, continue measuring and tracing out each notch until you have
completed six rises. To finish the stringer layout, extend the bottom
line of the last run backwards to the bottom edge of the stringer.
This will be the point of the stringer that contacts the landing. Cut out the waste with a circular saw.