Free CCTV Camera Calculators for Security System Design
Six free tools for planning an IP camera system: field of view, lens focal length, DORI distances, recording storage, network bandwidth and UPS backup. Pick a calculator below — results update instantly.
FOV Calculator
Calculate horizontal and vertical field of view angles, DORI zone distances, pixel density and blind spot from focal length, sensor format and resolution.
Open calculatorDORI Calculator
Get pixel density at your target distance and the Identify, Recognize, Observe and Detect distances defined by EN 62676-4, in metric or imperial units.
Open calculatorLens Calculator
Find the focal length for a scene width and distance, a DORI level or a field-of-view angle, and the nearest standard lens.
Open calculatorStorage & HDD Calculator
Estimate required HDD capacity and days of retention for IP camera groups by resolution, FPS, compression and recording schedule.
Open calculatorBandwidth Calculator
Add up IP camera bitrates in Mbps and MB/s, then check the total against your network link and your NVR's ingest limit.
Open calculatorUPS Battery Calculator
Work out the UPS VA rating and battery capacity for cameras, NVRs, PoE switches and access control at your target backup time.
Open calculatorReady to build your security plan?
Take these calculations further — design your full camera layout, route cables, and generate a professional PDF proposal.