About FOV Calculator

The site covers seven specialized calculators plus a general FOV hub: sim racing FOV from screen geometry, camera lens angle of view, CCTV coverage planning, telescope and binocular true field, microscope field diameter, and vertical-to-horizontal FOV conversion.

Each page places the interactive calculator first so you get answers before reading background material. Supporting sections explain formulas, common mistakes, and device examples without hiding the tool behind long introductions.

All math executes client-side using JavaScript and Alpine.js. Your inputs never leave your device, which keeps the tools fast on mobile networks and suitable for classroom or field use without connectivity concerns after the initial page load.

We use the same arctangent relationships found in lens datasheets and astronomy references. When manufacturers round specifications, small differences from our output are normal—always verify safety-critical surveillance layouts with on-site testing.

Photographers compare focal lengths before renting glass. Sim racers calibrate iRacing and ACC settings to measured seating positions. Homeowners model doorbell camera coverage. Students complete microscopy lab worksheets. Hobby astronomers plan eyepiece upgrades.

If you need a quick angle-of-view estimate or a repeatable setup reference, bookmark the calculators you use most and return whenever hardware or seating changes.

Results assume ideal rectilinear projection. Real lenses may exhibit distortion, especially ultra-wide and fisheye designs. Multi-monitor sim rigs include bezel gaps and curvature that pure geometry cannot fully model.

We iterate formulas against published examples and community benchmarks. Report discrepancies through our contact page so we can review edge cases and improve presets.