Free tools
The arithmetic an installer does on the tailgate, done properly. No signup, no email, and nothing to install — these run in the browser, so they work on a phone with one bar of signal.
Camera Field of View and PPF Calculator
Lens, sensor and resolution in; angle of view, scene width, pixels per foot, DORI range and the blind spot under the mount out.
Open the tool
CCTV Video Storage Calculator
Mixed camera groups in; terabytes, how many drives, and the bandwidth the switch has to carry out.
Open the tool
More on the way — PoE budget, voltage drop, NAC loop. If there is one you keep doing by hand, tell us which.