CCTV Identification-Distance Calculator
To identify a face or a number plate, the target needs about 250 px/m across it (the DORI “Identify” level). Enter the resolution, lens and sensor to see how far away a camera can still read a face or plate — and the softer recognise and detect distances for context. Planning figures; runs in your browser.
IDENTIFY needs about 250 px/m. Beyond the headline distance the target simply covers too few pixels to read reliably — you drop to recognise, then merely detect.
- Identify (250 px/m — read a face or number plate)8.2 m
- Recognise (125 px/m — recognise a known person)16.4 m
- Detect (25 px/m — spot that someone is there)81.9 m
Planning estimate only — this is the geometric limit. Real identification also needs adequate light, low subject motion and low video compression, and sensor widths vary by model. Use it to compare cameras and placements, then confirm with a site test.
Related Guides — Deep-dive reading
CCTV Resolution Explained (India 2026): How Many Megapixels You Actually Need
What MP, 1080p, 2K, 4K and 8MP really mean, how pixels-per-metre and DORI decide whether you can recognise a face or read a number plate, and why 'enough' beats 'maximum' for Indian homes and shops.
SecurityCCTV Optical vs Digital Zoom (India 2026): Which Actually Sees Detail
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SecurityCCTV-Compatible Lighting for Indian Homes (2026): How to Light a Scene So the Camera Actually Sees It
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SecurityRelated Tools — You may also find these useful
CCTV Detection-Distance Calculator
How far a camera can still detect that someone is present (DORI 25 px/m), with observe, recognise and identify for context.
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Focal length, sensor and resolution to field-of-view angle, scene width and DORI detect/observe/recognise/identify distances.
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How far a camera can still recognise a known person (DORI 125 px/m), from resolution, lens and sensor.
Recognise Distance