Fly Trap Spacing Calculator

Set smart trap spacing for healthier areas. Balance coverage, pressure, and wind factors in minutes. Improve capture rates with tidy placement and routine checks.

Calculator

Choose rectangle dimensions or a known total area.
Used for length, width, and perimeter values.
Only used when “Total area” is selected.
For patios, beds, sheds, and small lawns.
Enter the shorter side if uncertain.
Leave blank to auto-calc for rectangles.
Different types have different consistency.
Typical range: 10–60 m² per trap.
Higher overlap improves capture reliability.
Higher pressure needs denser trap spacing.
Wind can reduce attraction effectiveness.
Less frequent checks need extra traps.
Edges include fences, doors, compost lines.
Reference only, not used in equations.
Common range: 1.2–2.0 m outdoors.
Ensures a baseline for small spaces.
Optional: enforce a tighter spacing limit.
Reset

Example data table

These examples illustrate typical inputs and the resulting spacing.

Scenario Area (m²) Coverage (m²/trap) Pressure Wind Recommended traps Grid spacing (m)
Small patio near bins 30 15 High Moderate 3 3.16
Vegetable bed area 120 25 Medium Sheltered 5 4.90
Orchard edge strip 800 40 Severe Windy 35 4.78

Formula used

The calculator estimates the number of traps needed to cover your area, then converts that count into an approximate spacing pattern.

Use overlap when you want stronger coverage near compost, livestock, or doorways.

How to use this calculator

  1. Choose Length × width for rectangular spaces, or select Total area.
  2. Enter your size values using your chosen units.
  3. Select trap type and enter the expected coverage per trap.
  4. Set fly pressure, wind exposure, and maintenance frequency.
  5. Click Calculate and review spacing and trap counts.
  6. Download CSV or PDF to share the placement plan.

After installation, adjust trap density where flies concentrate.

Practical placement notes

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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.