Bobbin Thread Calculator

Calculate how many pre-wound or hand-wound bobbins you need for your sewing project.

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How It Works

A standard Class 15 bobbin holds about 40 yards of thread. A simple garment may use 1-2 bobbins, while a large quilt can use 10 or more. Pre-wound bobbins hold more thread because they are wound under tension by a machine. Always wind bobbins at a consistent tension to avoid thread nesting and tangles under the fabric.