Set room size, roll width, and direction quickly. See seams, cuts, repeats, and allowances instantly. Download a plan to guide careful garden installations everywhere.
| Room (L×W) | Roll width | Orientation | Strips | Seams | Aligned strip length |
|---|---|---|---|---|---|
| 6.000 × 4.000 m | 3.660 m | Seams along length | 2 | 1 | 6.200 m |
| 10.000 × 8.000 ft | 12.000 ft | Seams along width | 1 | 0 | 8.150 ft |
Garden sheds and potting rooms often have narrow doors, benches, and tool racks that force tight turns. A seam placed on a turning line can lift faster than one placed under a stable walkway. This calculator estimates where seams land so you can keep joins away from wet entry zones. In humid seasons, backing can hold moisture; planning seams away from irrigation splash lowers mildew risk and keeps cleaning easier, especially when you store fertilizers and soil nearby.
Room length and width define the usable rectangle, while roll width controls how many strips are required. The tool uses ceil(span/roll_width) to ensure full coverage. For example, a 4.00 m span with a 3.66 m roll needs 2 strips and 1 seam. Switching orientation can reduce seams when the long side matches the roll width better.
Perimeter allowance adds trimming margin for edges and thresholds, useful when walls are not square. Seam allowance adds extra length to support joining and final trimming. Waste factor then scales the total roll length; 8–12% is common for simple rooms, while patterned material may need 12–18% depending on repeat and defects.
When pattern repeat is provided, each strip length rounds up to the nearest repeat. This helps motifs align across seams and reduces obvious mismatches under bright task lighting. If your repeat is 0.50 m and the calculated strip length is 6.12 m, the aligned length becomes 6.50 m. Pile direction should remain consistent to avoid color shading differences between strips.
Seam offsets show where each join falls across the covered span, measured from the starting edge. Center-first ordering balances joins toward the middle, which can keep seams away from perimeter dampness. Use the CSV for site notes and the PDF for a quick printout before you cut. Always confirm roll width, backing, and join method with your supplier.
It switches whether seams run parallel to the room length or width. The coverage span changes, which can increase or reduce strip count and seam locations for the same roll width.
Enter it for carpets with a repeating motif or stripe. The calculator rounds strip length to the repeat, helping designs align across seams and reducing visible mismatch.
Use 8–12% for simple, plain material rooms. Use 12–18% for patterned carpet, tricky cuts, or if you expect more offcuts around benches, doorways, or pipes.
Pile direction affects light reflection. If strips flip direction, seams can look like color changes. Keeping direction consistent improves seam blending and overall visual uniformity.
Zero seams means one strip covers the full span for your selected orientation and roll width. You still may want perimeter allowance and waste for trimming and fitting.
It models a rectangle. For L-shapes, split the room into rectangles, run the calculator for each, and combine roll length totals. Add extra waste for complex transitions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.