Instead of just charging along like a bull at the gate, I'm going to plan my next project. A scarf.
I have a skein of handspun Corriedale that is about 364 yards long. I'll start by mentally dividing it in half, so half is for the warp and half is for the weft.
364 yards / 2 = 182 yards
I want the final piece to be 64 inches long, so I'll add 20% for shrinkage and draw in = about 77 inches. 77 + 24 (loom waste) = 101 inches. So, the warp will need to be about 101 inches long.
182 yards = 6552 inches
6552/101 = about 64.9
So, I will use 32 warp loops. My heddle has 100 slots, and (100-32)/2 is 34. I will center the warp and leave 34 empty slots on each side.
I'll let you know how it goes!