Resize a craft, sewing or paper pattern from its original size to a new one. Enter the original width and height, then a target width or height and the tool gives the scale factor and the new dimensions. This is an approximate helper, not a quote — scaling a pattern changes seam allowances, material needs and proportions, so adjust and test before cutting. All processing runs locally in your browser. Your data is not uploaded to any server. 100% Local
How to Use the Pattern Scaling Calculator
Choose your units, enter the original width and height, then a target width or height. Press Scale pattern to see the scale factor and the new size.
What it accounts for
A target width sets the scale from width; a target height sets it from height.
The other dimension is scaled by the same factor to keep the shape.
The percentage shows how much bigger or smaller the pattern becomes.
Scaling tips
Scaling does not resize seam allowances, notches or hardware, so fix those by hand. Enlarging also changes how a fabric or paper behaves, so test on scrap. Treat the result as an approximate guide, not a quote.
Features
Scale factor and percentage from a target width or height
New width and height keeping the original proportions
Metric and imperial units
Copy or download the estimate as a text file
All processing runs locally in your browser. Your data is not uploaded to any server.
Results are approximate guides, not a quote. Scaling changes seam allowances, material needs and proportions, so adjust and test before cutting or buying materials.