Calculator
Example data table
| Box size (L×W×H) | Pattern | Ease | Top panel cut |
|---|---|---|---|
| 23×12×8 cm | Panel | 4% | ~25.92 × 14.96 |
| 24×11×9 cm | Wrap | 5% | ~27.40 × 13.98 |
| 9×4.5×3.2 in | Panel | 3% | ~10.11 × 5.06 |
Examples assume 0.2 thickness, 1 seam, 1.5 hem (same units).
Formula used
- Effective length = L + 2·thickness + L·ease%.
- Effective width = W + 2·thickness + W·ease%.
- Top cut = (L_eff + 2·seam) × (W_eff + 2·seam).
- Side height cut = H + hem + seam.
- Panel cut widths = (L_eff + 2·seam) or (W_eff + 2·seam).
- Wrap strip length = 2·(L_eff+W_eff) + 4·seam.
- Elastic ≈ 0.90·perimeter, for light stretch.
How to use this calculator
- Measure the box length, width, and height on a flat surface.
- Pick your unit type and keep every field consistent.
- Add seam and hem allowances that match your sewing style.
- Increase thickness allowance for padded or stiff covers.
- Choose panel or wrap pattern, then select an opening style.
- Press Calculate size to view cut sizes.
- Download CSV for spreadsheets, or PDF for printouts.
- Cut pieces, mark openings, and stitch for a durable cover.
Project article
Standard tissue box dimensions seen in garden spaces
Most rectangular boxes used in potting sheds range from 22–25 cm long, 11–13 cm wide, and 7–10 cm tall. Boutique “lotion tissue” boxes are often taller, while travel boxes trend shorter. Measuring your exact box prevents rocking on greenhouse benches and keeps dispensers stable near watering cans.
Allowances that protect fit and stitch quality
Seam allowance commonly falls between 0.8–1.5 cm, depending on fabric fray and your needle choice. Bottom hem allowance near 1.0–2.0 cm helps the cover sit flat on uneven potting surfaces. The thickness allowance is practical for canvas, cork, or batting; 0.2–0.6 cm is a typical range.
Ease percentage and why it matters outdoors
Ease adds controlled slack for quick removal and cleaning after soil splash or fertilizer dust. A 3–6% ease level is comfortable for most cotton and poly blends. Stiffer materials often benefit from 6–10% to avoid corner strain. The calculator applies ease to both length and width, then adds thickness room.
Pattern options and fabric efficiency
Panel sets use one top and four sides, which suits directional prints like leaves or herbs. Wrap strips reduce seams and speed assembly, useful when making multiple covers for shed stations. Total fabric area is computed from each cut rectangle; add 10–15% for pattern matching and trimming.
Opening styles and durability targets
A centered slit is fastest and pairs well with narrow binding for long life. Oval openings spread stress and work smoothly with bias tape. Full-top frames suit rigid covers and can be reinforced with fusible interfacing. For windy patios, an elastic bottom cut to about 90% of perimeter improves grip.
FAQs
1) What ease percent should I start with?
Start at 4% for most cottons. Use 6–8% for stiff canvas or cork. If the cover feels loose, reduce by 1–2% and recut the side panels.
2) Do I measure the box with tissues inside?
Measure the box itself, not the tissue mound. The opening is designed for pulling tissues, while the cover fit relies on the box’s fixed outer dimensions.
3) Why add material thickness allowance?
Thickness allowance prevents a tight fit when you use batting, cork, or heavy canvas. It also reduces corner stress and helps seams sit cleanly after turning.
4) Which pattern style is best for beginners?
Wrap strip is simplest because it reduces corner joins. Panel sets are better when you want crisp corners or need to align a directional gardening print.
5) How do I size the top slit opening?
A practical slit length is about 60–70% of top length, centered. Finish edges with binding or a narrow hem to prevent fraying and tearing over time.
6) Can I use the fabric area to buy material?
Yes, but add waste. For a single cover, add 10–15% for cutting margins. For multiple covers, layout pieces to reduce offcuts and keep prints aligned.