Pattern Scaling Calculator

Pattern Scaling Calculator: Resize a Pattern Consistently

Scaling a sewing pattern up or down, whether for a different size or a printed pattern grid mismatch, requires applying the same percentage to every measurement to keep proportions correct. This calculator handles the conversion for each individual measurement.

The Formula

New Measurement = Original Measurement × (Scale% / 100)

Worked Example

A 20" original measurement scaled to 125%.

New Measurement = 20 × 1.25 = 25"

How to Use This Calculator

1. Enter the original measurement.
2. Enter the scale percentage (100% keeps the original size).
3. Click Calculate to get the new measurement.
4. Repeat for every measurement on the pattern using the same percentage.

Related Calculations

Use with the Seam Allowance Calculator once your scaled pattern pieces are finalized.