Pattern & Sizing Calculators
Pattern grading, ease calculations, and body measurement adjustments for perfect fit.
Pattern Sizing Calculator
Find the right pattern size from your body measurements.
Ease Calculator
Calculate wearing ease and design ease for comfortable garments.
Grading Calculator
Grade a pattern up or down between sizes with correct increments.
Pattern Scaling Calculator
Scale a pattern piece by percentage for enlarging or reducing.
Bust Adjustment Calculator
Calculate full bust or small bust adjustments for bodice patterns.
Waist Adjustment Calculator
Adjust waist measurements on skirt and trouser patterns.
Hip Adjustment Calculator
Calculate hip adjustments for skirts, trousers and dress patterns.
Length Adjustment Calculator
Lengthen or shorten pattern pieces at the correct adjustment lines.
Sleeve Length Calculator
Calculate correct sleeve length from shoulder to wrist measurements.
Neckline Calculator
Calculate neckline dimensions and binding length for various neckline styles.
10 free calculators in Pattern & Sizing
Getting the Right Fit from Sewing Patterns
Sewing pattern sizes differ from ready-to-wear sizes. Pattern companies use standardised body measurements, so a size 14 pattern may not match a size 14 from the high street. The key is to measure your body accurately — bust, waist, hip and back length — and choose the pattern size that best matches your measurements.
Ease is the difference between your body measurement and the finished garment measurement. Wearing ease (typically 5–8cm at the bust) allows for movement and comfort. Design ease adds extra fullness for style — a fitted blouse has minimal design ease, while an oversized coat may have 15cm+ of extra ease.
When your measurements fall between sizes or differ from standard proportions, you need to adjust the pattern. A Full Bust Adjustment (FBA) adds volume at the bust without altering the rest of the bodice. Similarly, hip and waist adjustments modify the lower body while keeping the overall fit. Pattern grading moves all edges of a pattern proportionally to create a different size.