Calculator
Enter field details and trap strategy
Use automatic spacing for a quick plan, or switch to manual spacing to match an existing layout.
Example data table
Sample outputs for quick comparison. Your results may differ with pressure, canopy, and placement choices.
| Scenario | Area | Trap type | Goal | Placement | Suggested spacing | Estimated traps |
|---|---|---|---|---|---|---|
| Vegetable plot, moderate pressure | 0.20 ha | Yellow sticky | Monitoring | Square grid | ~10.0 m × 10.0 m | ~2–3 traps |
| Orchard block, high pressure | 1.00 ha | Pheromone lure | Mass trapping | Perimeter + grid | ~6–8 m spacing interior | ~35–45 traps |
| Greenhouse aisle layout | 1,000 m² | Blue sticky | Monitoring | Along rows | Row spacing based; 8–15 m along-row | ~1–2 traps per 100 m |
Formula used
- Gross area: A = L × W (or user-provided area).
- Usable area: Au = max(0, (L − 2e) × (W − 2e)), where e is edge offset.
- Density model: D = Dbase × Mpressure × Mcanopy (traps/ha).
- Total traps: N = ceil((Au/10,000) × D), then clamped between min and max.
- Square spacing: s = √(Au/N).
- Rectangular spacing: sx/sy ≈ L/W and sx×sy = Au/N.
- Triangular spacing: s = √(2Au/(√3N)).
- Perimeter allocation: Nedge = round(N × p%), interior traps = N − Nedge.
- Perimeter spacing: sedge = P/Nedge, where P = 2(L+W) for usable rectangle.
How to use this calculator
- Choose Input mode: enter length and width, or enter total area.
- Select Trap type, then choose your Goal (monitoring or mass trapping).
- Set Pest pressure and Canopy density to adjust the density estimate.
- Pick a Placement pattern: grid, rows, or perimeter emphasis.
- Use Edge offset if you must keep traps away from borders.
- Keep Automatic mode for a quick recommendation, or use Manual to compute trap counts from spacing.
- Press Calculate spacing. Download outputs as CSV or PDF.