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Calcimator

Pattern Grading Calculator

Calculate adjusted measurements for grading sewing patterns between sizes. Get proportional adjustments for bust, waist, hip, shoulder, and sleeve.

Inputs

in
in
in/size

Results

Bust Adjustment

6 in

≈ 2 credit cards

Waist Adjustment

4.5 in

Hip Adjustment6 in
Shoulder Adjustment1.5 in
Sleeve Length Adjustment0.9 in
Sizes Apart4
How to Use This Calculator
  1. Select the base size and enter the base bust measurement.
  2. Enter the target bust measurement for the graded size.
  3. Select the grade rule and the number of sizes to grade.
  4. Review bust, waist, hip, and shoulder adjustments for each size in the graded range.
  5. Grade in small increments (1 size at a time) for best accuracy -- large multi-size grades accumulate error.

How the result changes with Target Bust

Target BustBust AdjustmentWaist Adjustment
31-5 in-3.75 in
393 in2.25 in
4913 in9.75 in
5721 in15.75 in

What each input means

Base Size Bust
Bust measurement of the base pattern size
Target Bust
Bust measurement of the target size
Grade Rule
Inches of bust change per size (typically 1-2 inches)
Sizes to Grade
Total number of additional sizes to generate from base

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Base Size Bust = 36, Target Bust = 42, Grade Rule = 1.5, Sizes to Grade = 4 = 4 input(s) provided
  2. Calculate Bust Adjustment
    Bust Adjustment
    6 = 6
  3. Calculate Waist Adjustment
    Waist Adjustment
    4.5 = 4.5
  4. Calculate Hip Adjustment
    Hip Adjustment
    6 = 6
  5. Calculate Shoulder Adjustment
    Shoulder Adjustment
    1.5 = 1.5

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