How much thread do you need for a queen size quilt?

A lot.

This is an excerpt from Superior Threads website:

They say that it is difficult to be exact because everyone's technique is different. So they give us averages. This is more or less. These numbers are for the top thread only. Double them if you use the same thread for the bobbin.

Light Quilting

Medium Quilting

Heavy Quilting

Lap/Crib Size

200 yds

400 yds

600 yds

Twin Size

400 yds

800 yds

1,200 yds

Queen Size

600 yds

1,00 yds

1,600 yds

King Size

700 yds

1,500 yds

2,000 yds

I thought that I had seen a more precise calculator online but I lost the link.

Happy thoughts,

Moe