Pattern Scaling Calculator

Summary

Enter your original measurements and a scale ratio to instantly resize any sewing or knitting pattern.

How it works

1. Enter each original measurement on its own row (one number per line).
2. Type your desired scale ratio — for example, 1.25 to enlarge by 25% or 0.8 to reduce by 20%.
3. Click "Scale Pattern" and all measurements are multiplied by the ratio instantly.
4. Review the side-by-side table showing original vs. scaled values.
5. Copy the results or clear the inputs to start a new calculation.

Use cases

• Grade a commercial sewing pattern up or down by a percentage.
• Convert knitting stitch and row counts when switching yarn gauges.
• Resize a quilt block pattern to a different finished size.
• Scale embroidery transfer dimensions to fit a new hoop size.
• Adjust a children's pattern to fit a specific child's measurements.
• Proportionally enlarge or shrink any set of measurements for craft projects.

Frequently Asked Questions