Determine what you want for an hourly rate and how long it will take you to finish to determine the charge. I’ve never charged for a quilt because then it is a chore. I’m not saying you shouldn’t charge, you absolutely should if that’s what is right for you.
A friend asked me to make a quilt from her Dad’s shirts for her Mom after he passed. Her and I went to LQS to get backing fabric, thread, etc. (it was a quilt as you go quilt so she didn’t have to pay someone to quilt it.) I didn’t charge for my time.
I learned then how little non-quilters know about how long it takes to make a quilt. I should have explained this from the start but didn’t know that she didn’t know. She kept calling to find out when the quilt would ready. Her Mom was very depressed over her the loss of her DH (she was 93 and they had met when they were teen-agers) and this quilt was intended to bring her comfort so I do understand where my friend was coming from. So I guess I’m trying to let you know that there is a lot of emotion and eagerness involved on the other end and want to give you a heads up.
My friend’s Mom passed away in January and she told me that her Mom slept with this quilt every night and would wrap herself up in it. The quilt is now with my friend and someday will go to her daughter.