Size Grading Calculator
Turn a base size and a grade rule into a full graded size run. Enter your fit-sample measurements and how much each point of measure grows per size, and the tool builds the chart across every size.
Grade rules differ by point of measure and are usually larger through the chest and hip than the neck or shoulder. Leave a base blank to drop that row.
Graded size run (cm)
| Point of measure | XS | S | M | L | XL |
|---|---|---|---|---|---|
| Chest / bust | 86 | 91 | 96 | 101 | 106 |
| Waist | 70 | 75 | 80 | 85 | 90 |
| Hip | 90 | 95 | 100 | 105 | 110 |
| Back length | 65 | 66.5 | 68 | 69.5 | 71 |
| Sleeve length | 58 | 59 | 60 | 61 | 62 |
| Shoulder width | 38 | 39 | 40 | 41 | 42 |
Before you cut a full size run
This is even, linear grading from one rule per measure. Production grading often changes the grade across the range, shapes it between sizes, and follows a nest proven on fit samples at the extremes. Validate the top and bottom sizes on a real body or form before you grade patterns.
Size grading FAQ
What is pattern grading?
Grading is scaling a pattern or size chart from one base size up and down into a full size run. Each point of measure grows by a set amount per size, called the grade rule. The base is usually the size you fit and proved on a sample, and the other sizes are derived from it.
How do I build a graded size chart?
Start with the measurements of your fit-sample size, then decide how much each point of measure should change per size. Add the grade for larger sizes and subtract it for smaller ones. Enter those numbers here and the tool builds the whole chart; the base size column is highlighted.
What is a grade rule?
A grade rule is the amount a single point of measure changes for each size step, for example five centimetres of chest per size. Different measures use different rules: the chest and hip usually grade more than the neck, shoulder, or armhole, which is why each measure has its own field.
Is even grading enough for production?
It is a solid starting chart, but production grading is rarely perfectly even. Grades often change across the range, larger at the big sizes, and are shaped and proven on fit samples at the extremes rather than only at the base. Validate your top and bottom sizes on a real body or form before grading patterns off the chart.