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How to Do Bias Binding Math

So how do you know how many yards of bias binding you’ll need for a quilt?
Get your calculators ready, because here is the simple equation!

Add up the length of all four sides of your quilt.
Add 18 to the total (this is to give you enough for mitered corners and joining up your ends).
Divide that total by 36 (because 36 inches in a yard) and then round up to the next whole number.

For example, if you have a throw quilt that is 50x50:

50+50+50+50 = 200
200 + 18 = 218
218 ÷ 36 = 6.1

So, rounding up, you would need 7 yards of binding to complete the quilt!