Sewing pattern scale calculator
Calculate a print percentage from a measured reference and see the expected uniformly scaled pattern dimensions.
Recommended print scale from 1% to 10,000%. Produces scale instructions and dimensions, not an edited PDF. Large prints may need tiling. Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Sewing pattern scale calculator
- Enter your measurements, rates or supplied recipe.
- Review the quantities, rounding and plan details.
- Download the result and verify it against your actual materials or a sample.
Useful next steps
Measure the print you actually have
Enter a reference length measured on the current printed pattern and the intended new reference length. Also enter the custom scale used to produce that print. This accounts for an earlier print that was already enlarged or reduced.
Verify the new reference before cutting
A reference printed as 9.5 cm instead of 10 cm at 100% calls for approximately 105.263% custom scale. Disable automatic fit-to-page and measure the new print in both directions. Uniform scaling also changes seam allowances and does not replace garment grading.
Save the plan
Download the result as CSV, plus a text or JSON report with formulas, values and assumptions. Everything is calculated on your device. Changing units keeps the entered numbers, so check the selected units before using the plan.