Focal Length Converter

Focal Length Converter turns the focal length printed on your lens into a real, comparable number — instantly.

Pick your sensor (Full Frame, APS-C Canon, APS-C Nikon/Sony/Fuji, Micro Four Thirds, 1 inch, Medium Format) and the app gives you the 35mm equivalent, the crop factor, and the exact horizontal, vertical, and diagonal angle of view — with a clean visual diagram of the cone of view.

Built for photographers, filmmakers, and anyone shopping for a new camera or lens.

KEY FEATURES
• 35mm equivalent for 6 sensor classes
• Crop factor shown next to every result
• Horizontal / vertical / diagonal field of view in degrees
• Live angle-of-view diagram
• Automatic lens classification: super wide, wide, wide standard, standard, portrait, telephoto, super telephoto
• Camera comparison mode — match the same field of view across two bodies (e.g. 50mm full frame ≈ 31mm APS-C)
• 20 languages
• Works 100% offline
• Light & dark theme

WHO IT'S FOR
• Photo enthusiasts comparing kit lenses across systems
• Filmmakers planning shots with crop sensors
• Photo students learning angle of view
• Camera buyers checking what 24mm really looks like on APS-C

No login. No tracking. No data leaves your phone.