Project Inputs
Results
Enter inputs and click Calculate to see results.
Example Data Table
Sample scenarios you can tweak and recalc:
| Length (m) | Width (m) | Roll W (m) | Roll L (m) | Side OL (m) | End OL (m) | Edge (m) | Waste (%) |
|---|---|---|---|---|---|---|---|
| 20 | 8 | 4.0 | 50 | 0.3 | 0.3 | 0.15 | 2 |
| 35 | 14 | 4.5 | 100 | 0.3 | 0.3 | 0.20 | 3 |
| 50 | 18 | 5.0 | 150 | 0.2 | 0.3 | 0.15 | 5 |
Formulae Used
- Effective panel width:
W_eff = RollWidth - SideOverlap - Panels required (covering across lay-perpendicular dimension):
N_panels = ceil( SitePerp / W_eff ) - Panel cut length:
L_cut = SiteAlong + 2×EndOverlap + 2×EdgeAllowance - Total fabric length pre-waste:
L_total = N_panels × L_cut - Total with wastage:
L_req = L_total × (1 + Waste%/100) - Rolls required:
N_rolls = ceil( L_req / UsableRollLength ) - Optional cost:
Cost = N_rolls × CostPerRoll
How to Use
- Enter site length and width in meters.
- Provide roll width and usable length per roll.
- Set overlaps and edge allowance to match project specs.
- Select lay direction to run panels along length or width.
- Optionally add cost per roll to estimate budget.
- Click Calculate, then export results as CSV or PDF.
FAQs
Typical lap ranges 0.3–0.6 m depending on soil, load, and product. Follow manufacturer and project specifications.
Yes. Panels running along the longer side reduce end seams; across may reduce side seams. Try both to compare rolls required.
Edge allowance enables trimming, anchoring, and contingencies at boundaries, minimizing gaps and ensuring proper embedment.
It is a user-defined contingency for cuts, damage, and site irregularities. Adjust based on experience and QA requirements.
This tool assumes a single roll width. For mixed widths, run separate scenarios and add totals.
No. Enter plan dimensions only. For slopes, increase length inputs to reflect true surface distances.