FOV to Focal Length Game Calculator

Summary

Enter a game's horizontal or vertical FOV and get the equivalent camera focal length in millimeters.

How it works

1. Enter your game's FOV angle (e.g. 90 for horizontal or 74 for vertical).
2. Select whether the FOV is horizontal or vertical.
3. Set the display aspect ratio (16:9, 4:3, 21:9, or a custom ratio).
4. The calculator converts horizontal FOV to the equivalent focal length using the standard formula: f = (sensor_width / 2) / tan(FOV / 2).
5. The result is shown in millimeters relative to a 36 mm full-frame sensor width.
6. A visual FOV arc diagram updates to illustrate the angle and perspective.

Use cases

• Matching a game screenshot's perspective to a real camera lens for compositing.
• Choosing a game FOV that mimics a cinematic 50 mm or 85 mm portrait lens.
• Cinematographers researching what real lens approximates a specific gameplay feel.
• Game designers setting FOV presets labeled with recognizable focal lengths.
• Comparing how FOV changes feel across different aspect ratios.
• Film students learning the relationship between angular FOV and focal length.
• Content creators picking FOV for recording gameplay that matches a cinematic look.
• Calibrating virtual cameras in Unreal Engine or Unity to real lens specs.

Frequently Asked Questions