sewcalcs.uk
Ease Calculator — Wearing Ease & Design Ease
Calculate the finished garment measurements by adding wearing and design ease to your body measurements.
Override the preset with your own ease — enter a negative value (e.g. -3cm) for stretch knit fabrics
How We Calculate This
Ease is the difference between your body measurement and the finished garment measurement.
The formula
Finished measurement = Body measurement + Ease amount
Ease amounts by fit type (total ease at the bust):
- Close fitting: 2.5–5cm (≈1–2in)
- Fitted: 5–8cm (≈2–3in)
- Semi-fitted: 8–10cm (≈3–4in)
- Loose: 10–15cm (≈4–6in)
- Oversized: 15–20cm (≈6–8in)
These are practical home-sewing guides combining minimum wearing ease (≈5–6.5cm bust, 2.5cm waist, 5–7.5cm hip for wovens) with light design ease. Big-4 commercial patterns (McCall’s, Vogue, Butterick, Simplicity) tend to label their bust-ease bands a little higher — Fitted 7.5–10cm (3–4in), Semi-fitted 10–12.5cm, Loose 12.5–20cm — so if you are cutting from a Big-4 envelope, check its finished-garment measurements rather than relying on the category name alone.
Knit fabrics stretch, so they often use negative ease (finished smaller than the body). Switch on “Custom Ease Overrides” and enter a negative value (e.g. −3cm at the bust) to model a fitted knit top.
Frequently Asked Questions
Wearing ease is the minimum extra room added to body measurements so you can move comfortably. Without ease, a garment would be skin-tight and restrict movement. Minimum wearing ease at the bust is approximately 5–6.5cm for woven fabrics.
Design ease is additional ease beyond wearing ease that creates the style silhouette. A fitted blouse has minimal design ease; a boxy jacket has substantial design ease. Design ease is a style choice, not a fit requirement.
Knit fabrics stretch, so they need less ease — and often negative ease (the garment is actually smaller than the body). A fitted knit top might have -2 to -5cm ease at the bust, relying on stretch for fit.
Measure the garment flat across bust, waist and hip, then double the measurement (for both sides). Subtract your body measurement. The difference is the total ease in that garment.
Related Calculators
Bust Adjustment Calculator
Calculate full bust or small bust adjustments for bodice patterns.
Hip Adjustment Calculator
Calculate hip adjustments for skirts, trousers and dress patterns.
Sleeve Length Calculator
Calculate correct sleeve length from shoulder to wrist measurements.
Neckline Calculator
Calculate neckline dimensions and binding length for various neckline styles.
Pattern Sizing Calculator
Find the right pattern size from your body measurements.
Was this calculator helpful?
Last updated: February 2026
All calculations are estimates. Always verify quantities before cutting or purchasing fabric.