Coverage Math: Yarn Needed by Size & Pile Height
Quick estimator so you buy the right amount—no shortages, minimal waste.
Quick Formula
Yarn Needed (meters) ≈ (Width × Height in cm) × (Pile Height in cm) × Stitch Density × Yarn Factor
Add 10–15% for waste/trim.
Example Calculations
| Rug Size | Pile Height | Yarn Type | Est. Yarn Needed |
|---|---|---|---|
| 60×90 cm (24×36") | 12 mm (cut) | Worsted (3-ply) | ~800–1,000 m |
| 45×60 cm (18×24") | 10 mm (loop) | Worsted (3-ply) | ~450–550 m |
| 90×120 cm (36×48") | 15 mm (cut) | Bulky (5-ply) | ~1,800–2,200 m |
These are estimates; design complexity adds 5–15%.
Factors that Affect Yarn Use
- Pile height: Higher = more yarn per stitch.
- Stitch density: Tight spacing = more yarn (3–4 stitches/cm standard).
- Yarn thickness: Bulky uses more length per area than DK.
- Design: Complex outlines or color changes add waste.
Quick Tips
- Buy 10–15% extra for trim, mistakes, and test lines.
- Track usage on first rug to calibrate future estimates.
- Use calculator from yarn guide for precise planning.
💡 Pro Tip: This math gets you close, but a complete course shows you color planning and yarn optimization. Learn advanced yarn planning