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Garment Size Grading Calculator

Work out garment size grading instantly with clear inputs, formula shown and shareable results.

About Garment Size Grading Calculator

Grading adds a fixed increment per size, and because a bodice pattern is drafted as a quarter of the body, each pattern piece moves by a quarter of that increment. The quarter rule is why a 4 cm grade only shifts a pattern edge by 1 cm, and getting it wrong doubles or quadruples the intended step.

Formulas

Size range

size k = base measurement + k x grade increment

Pattern movement

movement per pattern piece = grade increment / 4

Worked example

With the default values below, Garment Size Grading Calculator returns Largest size measurement of 104.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Base size bust or chestminimum 1 cm
88 cm
Grade increment per sizeminimum 0.1 cm
4 cm
Sizes in the rangeaccepts 1–15
5

Results

Largest size measurement
104.0 cm
Full size range
88, 92, 96, 100, 104 cm
Span from smallest to largest
16.0 cm
Grade applied at each quarter pattern piece
1.000 cm

Step by step

  1. 1Values used
  2. 2Size range
  3. 3Pattern movement
  4. 4Largest size measurement= 104.0 cm
  5. 5Full size range= 88, 92, 96, 100, 104 cm
  6. 6Span from smallest to largest= 16.0 cm
  7. 7Grade applied at each quarter pattern piece= 1.000 cm

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Garment Size Grading figure worked out?

size k = base measurement + k x grade increment. Grading adds a fixed increment per size, and because a bodice pattern is drafted as a quarter of the body, each pattern piece moves by a quarter of that increment.

Why does this matter?

The quarter rule is why a 4 cm grade only shifts a pattern edge by 1 cm, and getting it wrong doubles or quadruples the intended step.

What do I need to enter?

Enter base size bust or chest, grade increment per size, sizes in the range. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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