Home Infestation Severity Score Calculator
ANA›Life Services Authority›National Calculator Authority›Home Infestation Severity Score Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Home Infestation Severity Score Calculator
Estimate the severity of a pest infestation in your home using a weighted scoring model based on pest type, percentage of home affected, duration of infestation, and level of visible damage.
Pest Type
Ants / Flies / Gnats (Low Risk) Cockroaches / Fleas / Silverfish (Moderate Risk) Rodents / Bed Bugs / Wasps (High Risk) Termites / Carpenter Ants / Carpenter Bees (Structural Risk) Multiple Pest Types / Unknown Infestation (Critical)
Percentage of Home Affected (%)
Duration of Infestation (weeks)
Visible Damage Level
None – No visible damage Minor – Small droppings, minor stains Moderate – Chewed materials, visible nests Severe – Structural damage, large colonies
Number of Occupants (people)
Previous Treatment Attempts
None 1 attempt (DIY) 2–3 attempts (DIY or partial professional) 4+ attempts or professional treatment failed
Calculate Severity Score
function homCalc() { // Clear previous errors and result var errorIds = [ "hom-pest-type-error", "hom-area-pct-error", "hom-duration-error", "hom-damage-error", "hom-occupants-error", "hom-prev-treatment-error" ]; errorIds.forEach(function(id) { var el = document.getElementById(id); if (el) { el.textContent = ""; } }); document.getElementById("hom-result").style.display = "none";
var valid = true;
// Pest type multiplier (W_p) var pestTypeEl = document.getElementById("hom-pest-type"); var W_p = parseFloat(pestTypeEl.value);
// Area percentage (A) var areaEl = document.getElementById("hom-area-pct"); var A = parseFloat(areaEl.value); if (isNaN(A) || A 100) { document.getElementById("hom-area-pct-error").textContent = "Please enter a value between 1 and 100."; valid = false; }
// Duration in weeks (D) var durationEl = document.getElementById("hom-duration"); var D = parseFloat(durationEl.value); if (isNaN(D) || D 520) { document.getElementById("hom-duration-error").textContent = "Please enter a duration between 1 and 520 weeks."; valid = false; }
// Damage level (V) — 0 to 3 var damageEl = document.getElementById("hom-damage"); var V = parseInt(damageEl.value);
// Occupants (O) var occupantsEl = document.getElementById("hom-occupants"); var O = parseFloat(occupantsEl.value); if (isNaN(O) || O 20) { document.getElementById("hom-occupants-error").textContent = "Please enter between 1 and 20 occupants."; valid = false; }
// Previous treatment score (T) — 0 to 3 var treatmentEl = document.getElementById("hom-prev-treatment"); var T = parseInt(treatmentEl.value);
if (!valid) return;
/ * FORMULA: * * Severity Score (S) = W_p × [ (0.30 × A_norm) + (0.25 × D_norm) + (0.25 × V_norm) + (0.10 × O_norm) + (0.10 × T_norm) ] × 100 * * Where: * W_p = Pest type risk multiplier (1.0 – 3.0) * A_norm = A / 100 (area % normalized to 0–1) * D_norm = min(D, 52) / 52 (duration capped at 1 year, normalized) * V_norm = V / 3 (damage level normalized to 0–1) * O_norm = min(O, 10) / 10 (occupants capped at 10, normalized) * T_norm = T / 3 (treatment attempts normalized to 0–1) * * Raw weighted sum ranges from 0 to 1 before multiplying by W_p × 100. * Maximum possible raw score = 3.0 × 100 = 300, so we normalize final score to 0–100: * S_final = min(S / 3.0, 100) * * Severity Bands: * 0 – 20 : Minimal — Monitor; basic preventive measures * 21 – 40 : Low — DIY treatment likely sufficient * 41 – 60 : Moderate — Professional inspection recommended * 61 – 80 : High — Professional treatment required * 81 – 100 : Critical — Immediate professional intervention needed /
var A_norm = A / 100; var D_norm = Math.min(D, 52) / 52; var V_norm = V / 3; var O_norm = Math.min(O, 10) / 10; var T_norm = T / 3;
var weightedSum = (0.30 * A_norm) + (0.25 * D_norm) + (0.25 * V_norm) + (0.10 * O_norm) + (0.10 * T_norm); var rawScore = W_p * weightedSum * 100; var S = Math.min(rawScore / 3.0, 100); S = Math.round(S * 10) / 10;
// Severity band var band, advice, color; if (S " + S.toFixed(1) + " / 100 " + "#### Severity Level: " + band + " " + "Recommendation: " + advice + "
" + "" + "#### Score Breakdown (before pest multiplier) " + "" + "" + "Factor" + "Your Input" + "Weight" + "Contribution (0–100)" + "" + "Area Affected" + A + "%30%" + aContrib + "" + "Duration" + D + " week(s)25%" + dContrib + "" + "Visible DamageLevel " + V + "25%" + vContrib + "" + "Occupants" + O + "10%" + oContrib + "" + "Treatment AttemptsLevel " + T + "10%" + tContrib + "" + "" + "Pest type risk multiplier (Wp) applied: " + W_p + "× | Final normalized score: " + S.toFixed(1) + "
"; }
#### Formula
Severity Score (S) = min( Wp × [0.30×Anorm + 0.25×Dnorm + 0.25×Vnorm + 0.10×Onorm + 0.10×Tnorm] × 100 / 3.0 , 100 )
- Wp — Pest type risk multiplier: Low-risk pests = 1.0; Moderate = 1.5; High = 2.0; Structural = 2.5; Critical/Multiple = 3.0
- Anorm = Area affected (%) / 100
- Dnorm = min(Duration in weeks, 52) / 52 — capped at 1 year
- Vnorm = Visible damage level (0–3) / 3
- Onorm = min(Occupants, 10) / 10 — capped at 10
- Tnorm = Previous treatment score (0–3) / 3
- Division by 3.0 normalizes the maximum possible raw score (Wp,max=3.0) to 100.
Severity Bands: 0–20 Minimal | 21–40 Low | 41–60 Moderate | 61–80 High | 81–100 Critical
#### Assumptions & References
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