Measured edge to edge, after quilting — the quilt as it is, not as it was planned.
The strips
2½″ is the common double-fold; 2¼″ rolls tighter.
Quilting cotton is usually 42″ selvage to selvage; the math sets 2″ aside for selvages and joins.
Binding to make
—
of continuous binding — joins and the closing seam already counted
—
strips to cut
—
fabric needed
—
bias square, if curved
Your cuts, selvage to selvage
Sew slowly at the corners.
Nothing you type here is saved, sent, or seen. It runs entirely in your browser — there is no server, and the page works with the network switched off.