Security Monitoring Coverage Calculator
ANA›Life Services Authority›National Calculator Authority›Security Monitoring Coverage Calculator
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Security Monitoring Coverage Calculator
Estimate the percentage of your IT environment covered by security monitoring tools, weighted by asset criticality and monitoring depth.
### Asset Inventory
Total Endpoints (workstations, laptops, desktops)
Endpoints with EDR / AV Monitoring
Total Servers (physical + virtual)
Servers with SIEM / Log Monitoring
Total Network Devices (routers, switches, firewalls)
Network Devices with Flow / IDS Monitoring
Total Cloud Workloads / Instances
Cloud Workloads with CSPM / CloudTrail Monitoring
### Criticality Weights (must sum to 100)
Endpoint Weight (%)
Server Weight (%)
Network Device Weight (%)
Cloud Workload Weight (%)
### Monitoring Depth Scores (1–5 per category)
1 = basic alerting only | 3 = log collection + correlation | 5 = full behavioral analytics + response
Endpoint Monitoring Depth
Server Monitoring Depth
Network Monitoring Depth
Cloud Monitoring Depth
Calculate Coverage Fill in the fields above and click Calculate.
function secCalc() { // --- Raw inputs --- const totalEP = parseFloat(document.getElementById('sec-total-endpoints').value) || 0; const monEP = parseFloat(document.getElementById('sec-monitored-endpoints').value)|| 0; const totalSV = parseFloat(document.getElementById('sec-total-servers').value) || 0; const monSV = parseFloat(document.getElementById('sec-monitored-servers').value) || 0; const totalNW = parseFloat(document.getElementById('sec-total-network').value) || 0; const monNW = parseFloat(document.getElementById('sec-monitored-network').value) || 0; const totalCL = parseFloat(document.getElementById('sec-total-cloud').value) || 0; const monCL = parseFloat(document.getElementById('sec-monitored-cloud').value) || 0;
const wEP = parseFloat(document.getElementById('sec-weight-endpoints').value) || 0; const wSV = parseFloat(document.getElementById('sec-weight-servers').value) || 0; const wNW = parseFloat(document.getElementById('sec-weight-network').value) || 0; const wCL = parseFloat(document.getElementById('sec-weight-cloud').value) || 0;
const dEP = parseFloat(document.getElementById('sec-depth-endpoints').value) || 1; const dSV = parseFloat(document.getElementById('sec-depth-servers').value) || 1; const dNW = parseFloat(document.getElementById('sec-depth-network').value) || 1; const dCL = parseFloat(document.getElementById('sec-depth-cloud').value) || 1;
// --- Validation --- const errors = [];
if (totalEP totalEP) errors.push("Monitored endpoints cannot exceed total endpoints."); if (monSV > totalSV) errors.push("Monitored servers cannot exceed total servers."); if (monNW > totalNW) errors.push("Monitored network devices cannot exceed total network devices."); if (monCL > totalCL) errors.push("Monitored cloud workloads cannot exceed total cloud workloads.");
const weightSum = wEP + wSV + wNW + wCL; if (Math.abs(weightSum - 100) > 0.01) errors.push("Criticality weights must sum to exactly 100. Current sum: " + weightSum.toFixed(1) + "%.");
if ([dEP, dSV, dNW, dCL].some(d => d 5)) errors.push("Monitoring depth scores must be between 1 and 5.");
if (totalEP + totalSV + totalNW + totalCL === 0) errors.push("Enter at least one asset category with a total greater than 0.");
if (errors.length > 0) { document.getElementById('sec-result').innerHTML = 'Input Errors:' + errors.map(e => '').join('') + ''; return; }
// --- Step 1: Raw coverage ratio per category (0–1) --- // If total = 0 for a category, treat coverage as 0 (no assets = no gap, but weight still applies) const covEP = totalEP > 0 ? monEP / totalEP : 0; const covSV = totalSV > 0 ? monSV / totalSV : 0; const covNW = totalNW > 0 ? monNW / totalNW : 0; const covCL = totalCL > 0 ? monCL / totalCL : 0;
// --- Step 2: Depth-adjusted coverage per category --- // Depth score normalized to 0–1 range: (depth - 1) / 4 // Effective coverage = raw_coverage * (0.5 + 0.5 * depth_normalized) // This means even 100% asset coverage at depth=1 yields only 50% effective coverage. const depthNormEP = (dEP - 1) / 4; const depthNormSV = (dSV - 1) / 4; const depthNormNW = (dNW - 1) / 4; const depthNormCL = (dCL - 1) / 4;
const effEP = covEP * (0.5 + 0.5 * depthNormEP); const effSV = covSV * (0.5 + 0.5 * depthNormSV); const effNW = covNW * (0.5 + 0.5 * depthNormNW); const effCL = covCL * (0.5 + 0.5 * depthNormCL);
// --- Step 3: Weighted overall coverage score --- // Coverage_overall = Σ (weight_i / 100 * effective_coverage_i) const overallCoverage = (wEP/100)effEP + (wSV/100)effSV + (wNW/100)effNW + (wCL/100)effCL; const overallPct = overallCoverage * 100;
// --- Step 4: Unmonitored asset counts --- const gapEP = totalEP - monEP; const gapSV = totalSV - monSV; const gapNW = totalNW - monNW; const gapCL = totalCL - monCL; const totalAssets = totalEP + totalSV + totalNW + totalCL; const totalGap = gapEP + gapSV + gapNW + gapCL;
// --- Step 5: Risk tier --- let riskTier, riskColor; if (overallPct >= 85) { riskTier = "Strong Coverage — maintain and continuously validate."; riskColor = "#27ae60"; } else if (overallPct >= 65) { riskTier = "Moderate Coverage — significant gaps remain; prioritize high-weight categories."; riskColor = "#f39c12"; } else if (overallPct >= 40) { riskTier = "Weak Coverage — high risk of undetected incidents; immediate remediation recommended."; riskColor = "#e67e22"; } else { riskTier = "Critical Gap — most of the environment is unmonitored; escalate to leadership."; riskColor = "#c0392b"; }
// --- Step 6: Per-category raw % for display --- const rawEPpct = (covEP * 100).toFixed(1); const rawSVpct = (covSV * 100).toFixed(1); const rawNWpct = (covNW * 100).toFixed(1); const rawCLpct = (covCL * 100).toFixed(1); const effEPpct = (effEP * 100).toFixed(1); const effSVpct = (effSV * 100).toFixed(1); const effNWpct = (effNW * 100).toFixed(1); const effCLpct = (effCL * 100).toFixed(1);
// --- Render --- document.getElementById('sec-result').innerHTML = ` ### Results
Overall Weighted Effective Coverage: ${overallPct.toFixed(1)}%
Risk Tier: ${riskTier}
Category Total Monitored Gap Raw Coverage Depth Eff. Coverage Weight
Endpoints ${totalEP} ${monEP} ${gapEP} ${rawEPpct}% ${dEP}/5 ${effEPpct}% ${wEP}% Servers ${totalSV} ${monSV} ${gapSV} ${rawSVpct}% ${dSV}/5 ${effSVpct}% ${wSV}% Network Devices ${totalNW} ${monNW} ${gapNW} ${rawNWpct}% ${dNW}/5 ${effNWpct}% ${wNW}% Cloud Workloads ${totalCL} ${monCL} ${gapCL} ${rawCLpct}% ${dCL}/5 ${effCLpct}% ${wCL}%
Total ${totalAssets} ${totalAssets - totalGap} ${totalGap} — 100%
Unmonitored Assets: ${totalGap} of ${totalAssets} (${totalAssets > 0 ? ((totalGap/totalAssets)*100).toFixed(1) : 0}% of total inventory)
`; }
#### Formula
Step 1 — Raw Coverage per Category: RawCovi = Monitored Assetsi / Total Assetsi
Step 2 — Depth-Adjusted Effective Coverage per Category: DepthNormi = (DepthScorei − 1) / 4 (normalises 1–5 scale to 0–1) EffCovi = RawCovi × (0.5 + 0.5 × DepthNormi) A depth score of 1 caps effective coverage at 50% even if all assets are monitored; a depth score of 5 allows full 100% effective coverage.
Step 3 — Weighted Overall Coverage: Coverageoverall = Σ (Weighti / 100 × EffCovi) where weights reflect the relative business criticality of each asset category and must sum to 100.
#### Assumptions & References
- The depth multiplier (0.5 + 0.5 × DepthNorm) is based on the principle that passive alerting alone (depth 1) provides at most 50% of the security value of full behavioral analytics (depth 5) — consistent with MITRE ATT&CK detection coverage guidance.
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