Output
Degrees
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FOV Calculator
Convert horizontal and vertical field of view for an aspect ratio.
Free to useNo downloadNo sign-up
FOV Calculator · At a glance
Quick answer: Convert horizontal and vertical field of view for an aspect ratio. At 16:9, 90 degrees horizontal corresponds to about 58.72 degrees vertical.
FOV Calculator
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Specify the field-of-view direction and aspect ratio.
- Convert between horizontal and vertical angles using the same projection model.
Input
Values and units entered in the calculator
Browser requirement
Local arithmetic; no hardware access
Processing
Runs on your device; no tool-result upload
How it works and what the result means
The result is a mathematical estimate under the stated formula. It does not read your hardware or change system settings.
Reading the result
At 16:9, 90 degrees horizontal corresponds to about 58.72 degrees vertical. The aspect ratio is part of the conversion.
Worked example and assumptions
vertical FOV = 2 × atan(tan(horizontal FOV ÷ 2) ÷ aspect ratio)
90° horizontal FOV at 16:9 corresponds to approximately 58.72° vertical.
All displayed inputs and results are degrees. Games can define their FOV slider differently.
90° horizontal FOV at 16:9 corresponds to approximately 58.72° vertical.
All displayed inputs and results are degrees. Games can define their FOV slider differently.
What to check next
Check how the game defines its FOV slider. A value based on a reference aspect ratio may need a different interpretation.
Keep consistent units and compare the assumptions with your actual game, display or network configuration.
Frequently asked questions
Can I paste the same FOV number into every game?
Only when their angle conventions match. Horizontal, vertical and reference-aspect definitions are not interchangeable.
How do I start the FOV Calculator?
Enter your own values and press Calculate. Units are shown beside each field; invalid or impossible values are rejected.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Will this change my device or game settings?
No. The calculator or generator only creates a result for you to review. It does not detect or modify your hardware, operating system or game configuration.
Why can another calculator show a different answer?
Compare the units, rounding and assumptions. The same inputs and formula give the same result here; background CPU load does not change the mathematics.