How to use it
- Measure the same reference line on the original and target.
- Enter both values in the same unit.
- Calculate the factor and print or transform percentage.
Pattern Scaling Calculator
Find a uniform scale factor from one known measurement to a target measurement.
About the Pattern Scaling Calculator
Calculate the mathematical percentage for uniform enlargement or reduction.
Formula
Scale factor equals target measurement divided by original measurement; scale percentage is that factor times 100.
Example
Changing a 90-unit measurement to 99 units gives a factor of 1.1 and a scale of 110%.
Notes
Uniform scaling changes every dimension equally. It is not garment grading and does not account for fit, ease, seam allowance or body proportions.