Rodent Infestation Severity Calculator

ANA›Life Services Authority›National Calculator Authority›Rodent Infestation Severity Calculator

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Rodent Infestation Severity Calculator

Estimate the severity of a rodent infestation using observable signs, affected area, and environmental risk factors. The result guides appropriate response actions.

Fresh Droppings Found (count per day)

Gnaw Marks / Damaged Items (count)

Tracks or Runways Observed (count)

Nests Found (count)

Live or Dead Rodent Sightings (count per week)

Affected Area (square feet)

Food Sources Accessible? (0 = No, 1 = Partially, 2 = Yes)

No – food is secured Partially – some exposure Yes – food freely accessible

Entry Points Identified (count)

Duration of Infestation (weeks)

Calculate Severity

function rodCalc() { // --- Collect inputs --- var droppings = parseFloat(document.getElementById('rod-droppings').value); var gnaw = parseFloat(document.getElementById('rod-gnaw').value); var tracks = parseFloat(document.getElementById('rod-tracks').value); var nests = parseFloat(document.getElementById('rod-nests').value); var sightings = parseFloat(document.getElementById('rod-sightings').value); var area = parseFloat(document.getElementById('rod-area').value); var food = parseFloat(document.getElementById('rod-food').value); var entry = parseFloat(document.getElementById('rod-entry').value); var duration = parseFloat(document.getElementById('rod-duration').value);

// --- Validation --- var errors = []; if (isNaN(droppings) || droppings 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

/ * ── FORMULA ────────────────────────────────────────────────────────────── * * Infestation Severity Score (ISS) is computed from weighted sub-scores: * * 1. Sign Score (SS) — observable evidence of rodents * SS = (droppings × 0.40) + (gnaw × 0.25) + (tracks × 0.15) + (nests × 0.20) * Normalised to 0–100 using reference maxima: * droppings_max = 100, gnaw_max = 40, tracks_max = 20, nests_max = 10 * SS_norm = min(SS / SS_max × 100, 100) * where SS_max = (100×0.40)+(40×0.25)+(20×0.15)+(10×0.20) = 40+10+3+2 = 55 * * 2. Population Pressure Score (PPS) * PPS = min((sightings / 10) × 100, 100) * (10 sightings/week = maximum pressure) * * 3. Density Score (DS) — sightings relative to area * density = sightings / area (rodents per sq ft per week) * DS = min((density / 0.05) × 100, 100) * (0.05 rodents/sq ft/week = severe threshold) * * 4. Risk Factor Score (RFS) * RFS = (food × 25) + (min(entry, 5) × 5) + min(duration × 2, 30) * Max RFS = 50 + 25 + 30 = 105 → capped at 100 * * 5. Composite ISS (0–100) * ISS = (SS_norm × 0.30) + (PPS × 0.25) + (DS × 0.20) + (RFS × 0.25) * * Severity Bands: * 0–20 : Minimal – monitor, basic sanitation * 21–40 : Low – DIY trapping, seal entry points * 41–60 : Moderate – professional inspection recommended * 61–80 : High – professional extermination required * 81–100: Severe – immediate professional intervention * ───────────────────────────────────────────────────────────────────────── /

// 1. Sign Score var SS_raw = (droppings * 0.40) + (gnaw * 0.25) + (tracks * 0.15) + (nests * 0.20); var SS_max = (100 * 0.40) + (40 * 0.25) + (20 * 0.15) + (10 * 0.20); // = 55 var SS_norm = Math.min((SS_raw / SS_max) * 100, 100);

// 2. Population Pressure Score var PPS = Math.min((sightings / 10) * 100, 100);

// 3. Density Score var density = sightings / area; var DS = Math.min((density / 0.05) * 100, 100);

// 4. Risk Factor Score var RFS_raw = (food * 25) + (Math.min(entry, 5) * 5) + Math.min(duration * 2, 30); var RFS = Math.min(RFS_raw, 100);

// 5. Composite ISS var ISS = (SS_norm * 0.30) + (PPS * 0.25) + (DS * 0.20) + (RFS * 0.25); ISS = Math.min(Math.max(ISS, 0), 100);

// Estimated population range (rough heuristic) // Based on: 1 dropping ≈ 1 rodent produces ~40–50/day; nests hold 4–8 rodents var popLow = Math.round(Math.max(droppings / 50, nests * 4, sightings * 0.5)); var popHigh = Math.round(Math.max(droppings / 35, nests * 8, sightings * 1.5)); if (popHigh ' + 'Component' + 'Score (0–100)' + 'Weight' + 'Contribution' + 'Sign Score (droppings, gnaw, tracks, nests)' + '' + SS_norm.toFixed(1) + '' + '30%' + '' + (SS_norm * 0.30).toFixed(1) + '' + 'Population Pressure Score (sightings)' + '' + PPS.toFixed(1) + '' + '25%' + '' + (PPS * 0.25).toFixed(1) + '' + 'Density Score (sightings per sq ft)' + '' + DS.toFixed(1) + '' + '20%' + '' + (DS * 0.20).toFixed(1) + '' + 'Risk Factor Score (food, entry, duration)' + '' + RFS.toFixed(1) + '' + '25%' + '' + (RFS * 0.25).toFixed(1) + '' + 'Infestation Severity Score (ISS)' + '' + '' + ISS.toFixed(1) + '' + '' +

'Estimated Rodent Population: ' + popLow + ' – ' + popHigh + ' individuals

' + 'Recommended Action: ' + action + '

'; }

#### Formula

Infestation Severity Score (ISS) is a weighted composite of four sub-scores, each normalised to 0–100:

Severity Bands: 0–20 Minimal | 21–40 Low | 41–60 Moderate | 61–80 High | 81–100 Severe

Estimated Population: Derived from droppings (÷35–50 per rodent/day), nests (4–8 per nest), and sightings (×0.5–1.5 factor).

#### Assumptions & References

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