Elastic Length Calculator
Calculate exactly how much elastic to cut for waistbands, cuffs, lingerie, and swimwear.
Measure the body part where elastic will sit
Elastic Reduction Reference by Type & Application
| Elastic Type | Application | Snug Ratio | Standard Ratio | Relaxed Ratio |
|---|---|---|---|---|
| Non-roll / Woven | Waistband | 75% | 85% | 90% |
| Braided | Waistband | 72% | 83% | 88% |
| Knit / Plush-back | Waistband | 75% | 85% | 90% |
| Lingerie / Swimwear | Swimwear | 65% | 75% | 80% |
| Lingerie / Swimwear | Underwear | 70% | 78% | 85% |
| Fold-over (FOE) | Neckline | 80% | 88% | 93% |
| Any | Sleeve / Leg Cuff | 75% | 85% | 90% |
How to Use the Elastic Length Calculator
- Measure the body part where the elastic will sit (e.g., your natural waist for a waistband).
- Select the type of elastic you are using — different elastic types have different stretch and recovery properties.
- Select the application (waistband, cuff, underwear, etc.) and your desired fit.
- Click Calculate to get your cut elastic length.
Elastic Types
- Non-roll / Woven: Firm, holds shape well. Good for waistbands. Does not narrow when stretched.
- Braided: Narrows when stretched, loses strength when pierced by needles. Best used in a casing. Most economical type.
- Knit / Plush-back: Soft and comfortable against skin. Good for activewear and waistbands worn against the body.
- Lingerie / Swimwear: Narrow, strong, and often has a decorative edge. Designed for high-stretch, chlorine-resistant use.
- Fold-over (FOE): Used to finish edges while adding stretch. Common on necklines and armholes.
Tips
- Always cut elastic about 2–3" longer than calculated, then try on and trim to fit. It is easier to remove length than add it back.
- When joining elastic ends, overlap 1" and sew a box or zigzag stitch to secure. Factor this into your cut length.
- Elastic loses stretch and recovery over time — use quality elastic rated for the application (swimwear elastic for swimwear, etc.).
About this Elastic Length Calculator
Use this free Elastic Length Calculator to get quick, accurate results directly in your browser. It is designed for everyday use with no signup, no downloads, and no account required. No signup is required, and the tool works on phones, tablets, and desktop browsers.