About Focal Length Calculator
Calculate 35mm equivalent focal length and horizontal, vertical, and diagonal field of view (FOV) across sensor crop factors from smartphones to medium format.
Key Capabilities & Features
- Calculates 35mm full frame equivalent focal length across 8 camera sensor formats
- Horizontal, vertical, and diagonal field of view (FOV) in degrees
- Lens classification (Ultra-Wide, Wide, Normal, Portrait, Telephoto, Super-Telephoto)
- Quick focal length presets from 16mm ultra-wide to 400mm super-telephoto
How to Use Focal Length Calculator
Select Sensor
Choose your camera sensor format (Full Frame, APS-C, Micro 4/3, Smartphone).
Input Focal Length
Enter the focal length in millimeters printed on your lens barrel.
View 35mm Equivalent
Inspect the true angle of view and full-frame focal equivalent.
Privacy & In-Browser Execution Guarantee
100% client-side calculation. Your camera specs stay private in your browser.
Frequently Asked Questions
What is 35mm equivalent focal length?
It represents the lens focal length needed on a traditional 35mm full frame sensor to capture the identical field of view as your cropped sensor.
Does crop factor change the physical focal length of the lens?
No, focal length is a fixed optical property of the lens glass. The sensor simply crops the projected image circle, resulting in a narrower field of view.