Tools ยท 6 calculators
Six free calculators that work out a security camera system from the camera count to the backup battery, each with its math shown and a link that keeps your inputs.
01Cameras
How many cameras your space needs, one per question you need answered, and the recorder size that fits.
Example A small shop with two doors, one register, a stock room, an office and one sales floor comes to 6 cameras.
02Cameras
How far a camera can identify, recognize, observe and detect a person, and how wide the view is there.
Example A 4MP camera with an 80 degree lens identifies a face to about 20 ft and detects a person to about 200 ft.
03Cameras
How many days of video a drive keeps before the oldest is overwritten, or the drive a retention goal needs.
Example 8 cameras at 2.5 Mbps each on an 8 TB drive keep about 37 days.
04Cameras
The upload your cameras need for cloud recording and remote viewing, and how many your line can carry.
Example 12 cameras at 4 Mbps need 48 Mbps. A 20 Mbps upload with half kept free carries 2 of them all day.
05Networking
Whether a PoE switch can power every camera, by class and by measured draw, with the headroom left.
Example 13 cameras reserve 164.4 W by class on a 120 W switch, so two get no power, yet all 13 draw only 99 W on a cold night.
06Power backup
How long a UPS keeps the recorder, switch and cameras recording in an outage, and the battery a target runtime needs.
Example 117 W on a 432 Wh battery gives 3.14 h by the formula and about 2 h 12 min to plan on.
Results are estimates from your inputs; a site survey sets the real numbers. No sign-up; your inputs live in the page link.
Each answer feeds the next: the camera count goes into storage and bandwidth, and the camera watts from the PoE tool are a large share of the UPS load.
Flow 1
Flow 2
The guides explain the choices around each number.
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