Size liners for raised beds, pots, and boxes. Account for depth, taper, and overhang easily. Download CSV or PDF and cut liner accurately now.
| Planter Type | Inputs | Overhang | Waste | Estimated Liner Sheet |
|---|---|---|---|---|
| Rectangular box | 80 × 40 × 30 (cm) | 5 cm | 10% | ~ (80 + 2×30 + 2×5) by (40 + 2×30 + 2×5) |
| Tapered planter | Top 70 × 35, Bottom 60 × 25, Depth 28 (cm) | 4 cm | 12% | Uses max(top,bottom) then adds depth and allowances |
| Circular pot | Diameter 45, Depth 35 (cm) | 6 cm | 8% | ~ (45 + 2×35 + 2×6) square sheet |
This calculator estimates the flat liner sheet needed to line planters before filling with soil. It supports box, tapered, and round containers, and it adds allowances so the liner can be folded neatly over the rim or fastened under a cap board. Accurate liner sizing reduces stretching, tearing, and messy patchwork during installation.
Use inside measurements because the liner sits against interior faces. Enter top length and width for boxes, or diameter for round pots. Depth should be measured from the rim seating line to the base. For tapered planters, bottom dimensions improve accuracy by using the larger of top and bottom faces as the governing cut size.
Overhang provides extra material above the rim for stapling, clamping, or tucking. Fold allowance helps when liners are thick or corners are sharp, where pleats consume material. Waste percentage covers trimming, drain penetrations, and handling errors. For simple shapes, 5% may suffice, while raised beds and heavy materials often need 10–15%.
The sheet dimension is computed by adding twice the depth plus allowances to the governing base dimension. A small pleat factor is included for deep planters to reduce shortage risk at corners or around circumference. Outputs include sheet length, sheet width, and area in square meters, plus an optional cost estimate when a unit price is provided.
Dry-fit the liner first, then press it into corners and mark folds. Make small X-slits for drain holes and reinforce with patches or gaskets to prevent spreading. Avoid sharp fasteners directly on the liner; use battens or washers. For outdoor or water-holding planters, select UV-resistant material and increase overhang for secure anchoring. Label cuts, keep seams centered, and store remaining liner flat for future repairs later.
Use 3–8 cm for small pots and 5–12 cm for raised beds. Increase it if you will fold over a rim, clamp under a batten, or expect soil to press hard against edges.
Deep planters need folds at corners or gathers around curves. A small allowance helps the liner sit flat without tension, reducing the chance of tears, pinholes, or a liner that stops short.
Measure inside dimensions. The liner follows the interior walls and base, so inside measurements match the surface the liner must cover. Outside measurements can oversize the sheet and waste material.
Use 5% for simple cuts and careful work. Use 10–15% for thick liners, tapered planters, drain penetrations, or when you want extra material for patching and reinforcement.
Seat the liner first, then mark the hole locations. Cut small X-shaped slits, not large circles. Reinforce with a patch, gasket, or grommet so the opening does not spread over time.
Yes. Add more overhang, keep folds smooth, and choose durable pond-grade material. Water weight increases stress, so avoid sharp fasteners and protect edges with battens, washers, or protective strips.
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.