FOV Converter
Translate a rectilinear field of view between horizontal and vertical conventions. Compare two aspect ratios while preserving vertical FOV, the convention used for this comparison. The diagram shows angular coverage, not a game screenshot.
Calculations run locally in your browser. This tool does not upload your inputs. Shared links contain the calculator settings you choose to share; Steam IDs are excluded.
How to use it
Enter your FOV, choose whether it is horizontal or vertical, and select source and target aspect ratios. Calculate to see both axes at each ratio. Confirm which axis your game setting uses.
How it works
Horizontal FOV = 2 × atan(tan(vertical FOV / 2) × aspect ratio). The inverse divides by aspect ratio. Conversion preserves vertical FOV and assumes a rectilinear perspective camera.
Limitations
Games may use a fixed 4:3 reference, crop the view, limit ultrawide support or change FOV during aiming. This tool does not model those behaviors or match mouse sensitivity. Input must be greater than 0 and less than 179 degrees.
Frequently asked questions
Will the converted number work in every game?
Only if the game uses the selected axis and actual aspect ratio with a rectilinear camera. Check the game documentation.
Why does ultrawide increase horizontal FOV?
With vertical FOV held constant, a wider viewport includes more of the scene horizontally.
Related gaming tools
- Keyboard Tester
- Mouse DPI Analyzer
- Gaming Storage Planner
- Game Completion Planner
- Tournament Bracket & Match Scheduler
- Minecraft Portal & Travel Planner
- Gaming Setup Troubleshooter
- Controller & Stick Drift Tester
- Mouse Sensitivity Converter
- Game Release Countdown
- Steam ID Converter
- Game Download Time Calculator
Tool last updated: