Here is a short list of modern security camera calculators and design tools (year 2021):
10 Camera Lens Calculators
AXIS Lens Calculator and AXIS Site Designer https://www.axis.com/tools
BOSCH Lens Calculator https://www.boschsecurity.com/LensCalculator/html/lens-calculator.html
Dahua Toolbox Calculator
https://dahuawiki.com/Software/Dahua_Toolbox/CameraCalculator , Design Tool
Hanwha Calculator and Tools
https://www.hanwhasecurity.com/field-of-view-calculator/ ,
Hikvision (Desktop Tool) https://www.hikvision.com/europe/support/tools/desktop-tools/lens-selection-v2-0-4-1/ and online tools https://tools.hikvision.com/#/lensSelection
IDIS FOV Calculator https://designtool.idisglobal.com/design_tool/fov_calculator.php
JVSG Universal Camera Calculator (more than 80 camera brands) https://www.jvsg.com/calculators/cctv-lens-calculator/
Pelco FOV Calcualtor https://www.pelco.com/training-support/design-tools/field-of-view-calculator/
