Select a Calculator.

Focal Length Calculator
The Focal Length Calculator is used to determine the lens size required to see a certain size object from a distance.

Object Size Calculator
The Object Size Calculator is used to calculate the visible image size from a particular distance.

Try our CCTV Tools calculator app in the Apple® app store.

CCTV Tools Available on the App Store

Open CCTV Tools in the Apple® App Store

IMPORTANT:: These calculators are to be used as a guide ONLY and not relied on for critical Surveillance. Disk usage will vary depending on the complexity of the images, quality of the camera, amount of movement and other variables. It is the responsibility of the end user to test available disk space and ensure that enough free space is available