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Textile Pattern Grading Calculator

Grade sewing patterns up or down between sizes with proportional adjustments. Scale bust, waist, hip, and length measurements evenly.

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Inputs that matter
Base Size Measurement, Size Steps, Increment per Size, Measurement Type
Output to expect
Pattern Grading Calculator
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Grade Rules Between Sizes

Commercial sizes often grade 1 inch at bust, 1 inch at waist, and 1 inch at hip per size (total circumference). Divide by 4 for quarter-pattern adjustments.

Quarter pattern change = total grade increment / 4 per seam

Proportional Length Grading

Length grades in smaller increments — often ⅜ to ½ inch per size at center front/back and slightly less at side seams.

Length grade ≠ width grade; apply at designated lines

Nested vs Individual Size Lines

Nested patterns show all sizes on one sheet; grading verifies distance between size lines matches intended grade rules.

Size n to n+1 distance = grade rule at that body point

Updated: July 2026

Example Scenarios

Four size steps × 1 inch bust grade = 4 inches total circumference — 1 inch added at each quarter panel slash point.

Petite grading reduces torso length 1–1.5 inches without full width grade — separate length rules from circumference.

Between size 12 bust and size 10 waist — grade each point independently using split grade rules.

Common Mistakes to Avoid

Grading all edges equally including armholes and necklines

Armholes, neck, and shoulders use smaller grade increments than bust/waip — follow point-specific rules or fit suffers.

Confusing pattern size numbers with ready-to-wear sizes

Measure body and compare to pattern size chart before grading. Pattern size 12 ≠ retail size 12 across brands.

FAQ

Grading creates multiple sizes from one base pattern. Alterations adjust one pattern to fit one body — different goals and measurement spreads.

Varies by company, but ~1 inch at bust/waist/hip per size is common in US missess patterns. Always check brand size charts.

Home sewists often grade 1–2 sizes reliably. Beyond that, armhole, shoulder slope, and dart placement may need design adjustments, not just scaling.

Cut pattern to slash lines, spread or overlap by grade increment, tape, and redraw seams. Calculator gives spread distances at each point.

Usually seam allowance width stays constant — grade from stitch lines or add same SA after grading cut lines.

About Textile Pattern Grading Calculator

Pattern grading scales a base size to larger or smaller sizes while preserving design proportions. Enter key body measurements and grade rules to compute incremental changes at bust, waist, hip, and length points for slash-and-spread or XY grading.