I charge at least $.10 a square inch for basic quilting. I charge extra for stuff like close crosshatching, elaborate feathers etc. If the quilting is closer than 4 " apart the price goes up at least two cents per inch. I multiply the length times the width and divide by 144. That gives me the number of square inches. Since it is already partially done subtract that amount from the total. I assume it is already marked also. I charge my retail cost for things like batting, backing, binding etc. I also charge extra if I do the marking, basting and binding. I live in rural Maryland but close enough to Baltimore and Washington that I was able to get that much before the longarmers took over the world. I have a friend who does esquisite work. For about ten years she easily got $1000 a quilt. Many of hers appeared in shows etc. She is currently out of business.