Security Camera Coverage Calculator
ANA›Life Services Authority›National Calculator Authority›Security Camera Coverage 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; } }
Security Camera Coverage Calculator
Estimate how many security cameras are needed to fully cover a given area based on camera field of view, mounting height, and overlap requirements.
Area Length (meters)
Area Width (meters)
Camera Mounting Height (meters)
Camera Horizontal Field of View (degrees)
Camera Vertical Field of View (degrees)
Camera Tilt Angle from Vertical (degrees)
Desired Coverage Overlap (%)
Calculate
Results will appear here.
function secCalc() { var resultDiv = document.getElementById('sec-result');
var areaLength = parseFloat(document.getElementById('sec-area-length').value); var areaWidth = parseFloat(document.getElementById('sec-area-width').value); var mountHeight = parseFloat(document.getElementById('sec-mount-height').value); var fovH = parseFloat(document.getElementById('sec-fov-h').value); var fovV = parseFloat(document.getElementById('sec-fov-v').value); var tiltAngle = parseFloat(document.getElementById('sec-tilt-angle').value); var overlap = parseFloat(document.getElementById('sec-overlap').value);
// --- Validation --- if (isNaN(areaLength) || areaLength Please enter a valid Area Length (> 0).'; return; } if (isNaN(areaWidth) || areaWidth Please enter a valid Area Width (> 0).'; return; } if (isNaN(mountHeight) || mountHeight Please enter a valid Mounting Height (> 0).'; return; } if (isNaN(fovH) || fovH = 180) { resultDiv.innerHTML = 'Horizontal FOV must be between 10° and 179°.'; return; } if (isNaN(fovV) || fovV = 120) { resultDiv.innerHTML = 'Vertical FOV must be between 5° and 119°.'; return; } if (isNaN(tiltAngle) || tiltAngle = 90) { resultDiv.innerHTML = 'Tilt Angle must be between 0° and 89°.'; return; } if (isNaN(overlap) || overlap 50) { resultDiv.innerHTML = 'Overlap must be between 0% and 50%.'; return; }
var DEG = Math.PI / 180;
// --- Ground Coverage per Camera --- // The camera is mounted at height H, tilted at angle T from vertical. // The optical axis hits the ground at distance: d_center = H * tan(T) // // Near edge of vertical FOV (upper half of sensor looks farther): // angle_far = T + fovV/2 (from vertical) // angle_near = T - fovV/2 (from vertical) // // Ground distances along the tilt axis: // d_far = H * tan(angle_far) if angle_far 0°, else 0 (camera sees directly below) // // Depth of coverage along tilt axis: // coverageDepth = d_far - d_near // // Width of coverage (horizontal) at the center distance: // coverageWidth = 2 * d_center * tan(fovH/2) // (approximation using center distance; more accurate than using far distance)
var angleFar = tiltAngle + fovV / 2; var angleNear = tiltAngle - fovV / 2;
if (angleFar >= 90) { resultDiv.innerHTML = 'The combination of tilt angle and vertical FOV causes the camera to look at or above the horizon (tilt + fovV/2 ≥ 90°). Please reduce tilt or vertical FOV.'; return; }
var dFar = mountHeight * Math.tan(angleFar * DEG); var dNear = (angleNear > 0) ? mountHeight * Math.tan(angleNear * DEG) : 0;
var coverageDepth = dFar - dNear;
// Use center distance for width calculation var dCenter = mountHeight * Math.tan(tiltAngle * DEG); // If tilt is 0, camera looks straight down; use average of near/far for width var dForWidth = (tiltAngle === 0) ? (dFar / 2) : dCenter; var coverageWidth = 2 * dForWidth * Math.tan((fovH / 2) * DEG);
// Effective (non-overlapping) coverage per camera after accounting for overlap var overlapFactor = 1 - overlap / 100; var effectiveDepth = coverageDepth * overlapFactor; var effectiveWidth = coverageWidth * overlapFactor;
if (effectiveDepth Effective coverage is zero or negative. Reduce overlap or adjust camera angles.'; return; }
// --- Number of Cameras --- // Cameras needed along each axis var camerasAlongLength = Math.ceil(areaLength / effectiveDepth); var camerasAlongWidth = Math.ceil(areaWidth / effectiveWidth); var totalCameras = camerasAlongLength * camerasAlongWidth;
// Total area and coverage var totalArea = areaLength * areaWidth; var rawCoveragePerCamera = coverageDepth * coverageWidth; var totalCoverage = totalCameras * rawCoveragePerCamera; var coveragePercent = Math.min((totalCoverage / totalArea) * 100, 100);
// --- Output --- resultDiv.innerHTML = '### Results ' + '' + 'Ground Coverage per Camera' + '' + coverageDepth.toFixed(2) + ' m (depth) × ' + coverageWidth.toFixed(2) + ' m (width)' + 'Effective Coverage per Camera (after overlap)' + '' + effectiveDepth.toFixed(2) + ' m × ' + effectiveWidth.toFixed(2) + ' m' + 'Cameras Along Length' + '' + camerasAlongLength + '' + 'Cameras Along Width' + '' + camerasAlongWidth + '' + 'Total Cameras Required' + '' + totalCameras + ' cameras' + 'Area to Cover' + '' + totalArea.toFixed(2) + ' m²' + 'Estimated Coverage' + '' + coveragePercent.toFixed(1) + '%' + ''; }
#### Formulas Used
Ground depth of coverage (along tilt axis):
dfar = H × tan(T + FOVV/2) dnear = H × tan(T − FOVV/2) [= 0 if angle ≤ 0°] Coverage Depth = dfar − dnear
Ground width of coverage (horizontal):
dcenter = H × tan(T) Coverage Width = 2 × dcenter × tan(FOVH/2)
Effective coverage per camera (accounting for overlap):
Effective Depth = Coverage Depth × (1 − Overlap/100) Effective Width = Coverage Width × (1 − Overlap/100)
Number of cameras:
Cameras Along Length = ⌈Area Length / Effective Depth⌉ Cameras Along Width = ⌈Area Width / Effective Width⌉ Total Cameras = Cameras Along Length × Cameras Along Width
Where H = mounting height, T = tilt angle from vertical, FOVH = horizontal field of view, FOVV = vertical field of view.
#### Assumptions & References
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