Pattern Ease Calculator
Calculates the total pattern measurement — body measurement plus wearing ease and design ease — so your sewn garment fits correctly. Use it when drafting or grading a sewing pattern.
Last updated: September 2026
Formula below · 1 source (Wikipedia) · Updated Sep 2026
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About this calculator
Ease is the difference between your body measurement and the finished garment measurement. Wearing ease lets you breathe and move; design ease adds the intended silhouette. The garment setting is the typical total bust ease in inches for that garment: about 2 inches for a fitted blouse, 4 for a dress shirt, 6 for a casual top, 8 for a sweater, 12 for a jacket or blazer worn over layers and 16 for a coat. The fit setting scales it (0.8 very fitted, 1.0 standard, 1.2 relaxed, 1.4 oversized) and the fabric setting adjusts for the fabric (0.9 stretch/knit, 1.0 woven cotton, 1.05 linen, 1.1 heavy woven). The formula is: patternMeasurement = bodyMeasurement + garmentEase × fitFactor × fabricFactor. Very stretchy knits are often drafted with zero or negative ease; follow the pattern for those.
How to use
Your bust measures 36 inches. You're sewing a dress shirt (4 inches of ease), prefer a relaxed fit (1.2), and are using woven cotton (1.0). Step 1 — ease: 4 × 1.2 × 1.0 = 4.8 inches. Step 2 — pattern measurement: 36 + 4.8 = 40.8 inches. Choose the pattern size whose finished bust is about 40.75 inches. A fitted blouse (2 inches) in stretch fabric (0.9) at standard fit gives 36 + 1.8 = 37.8 inches.
Frequently asked questions
What is the difference between wearing ease and design ease in sewing patterns?
Wearing ease is the minimum extra room added to a garment so you can breathe, sit, and move without restriction — typically 1–2 inches at the bust for a fitted bodice. Design ease is additional room added deliberately by a designer to create a specific silhouette, such as the extra volume in an oversized shirt. Together, they determine the total ease built into a commercial pattern's finished measurements.
How does fabric stretch affect how much ease I should add to a pattern?
Stretch fabrics — like jersey or spandex blends — recover against the body as you move, so less ease is needed compared to rigid woven fabrics. In fact, many stretch-fabric patterns use negative ease (the garment is smaller than the body measurement) because the fabric provides comfort through stretch rather than extra room. This calculator reduces the pattern measurement by 0.5 inch for stretch fabrics to reflect that behavior.
Why do fitted garments need more ease calculation attention than loose-fitting styles?
Fitted garments have very little design ease built in, so even a small error in ease calculation results in a garment that is either uncomfortably tight or visibly baggy. Loose and oversized styles are far more forgiving because the extra ease already present masks fit discrepancies. When sewing structured fitted pieces like tailored jackets or fitted bodices, accurate ease calculation is critical to achieving the intended silhouette.