Tapering Calculator — Gradual Seam Adjustments

Tapering is gradually changing the seam width along a seam. For example, taking in more at the waist and less at the hip creates a smooth transition. A tapered seam blends naturally into the original seam line.

Mark the adjustment amount at the start and end points. Connect with a smooth curved line using a curved ruler or French curve. The line should blend gradually — avoid sharp angles which create puckers.

Always start and end tapering from the original stitch line. At the point where no adjustment is needed, your new stitch line should merge exactly with the old one. Sew a few stitches on the original line before the taper starts.

A general rule is to taper 3-4 times the adjustment amount. If taking in 2cm at the waist, the taper should be at least 6-8cm long. Longer tapers give smoother results.