I took the time to figure about what price I would charge for a Crib Quilt as that is mostly what I do. If it is a larger quilt I hand quilt by sections, then put together.
This is what I came up with::
The Amish Charge by the thread yardage $1.10 per yard.
A 400 yard spool of thread has 11.4 yards.
According to that calculation I would charge $75.00 for 45X45 inch crib quilt.
This would also depend upon the time it takes to quilt the quilt.
For instance, whatever time it took to use a needle full of thread, 5 minutes example, I would lower the price accordingly.
Since minimum wage is around $6.00 per hour, that is what I would aim for: number of hours X number of needles at 5 minutes per needle.
I have one ready to start. In a day or two will come back with further calculations and pricing.
Keep in mind, the more thread you use, the higher you would price a quilt.