FOV converter

Convert horizontal and vertical field of view for your display’s aspect ratio.

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Privacy details

FOV converter processes your input in this browser. Inputs and results are excluded from analytics. Recent tools save tool names, visit counts and last-visit times. Saved tools store only their names. Draft saving is optional and stays on this device; delete saved text with the draft controls. Loading text from a URL is optional and contacts that server; its URL and your IP address are visible to the server. An optional “Use in” action keeps a handoff in this tab. The next tool removes it on arrival and ignores it if more than a minute has passed.

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Field of view (degrees)

Input FOV

Aspect width

Aspect height

Your result

More options and calculation details

Rectilinear perspective only. Use the actual rendered viewport ratio, which can differ from the full display when a game adds bars or splits the screen.

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Updated 2026-09-19

How this conversion works

Horizontal and vertical fields of view describe different sides of the same perspective view. The aspect ratio connects their half-angle tangents.

Vertical FOV = 2 × atan(tan(horizontal FOV ÷ 2) × height ÷ width). Reverse the width and height ratio for horizontal FOV.

Next: Angle converter

A worked example

A 90° horizontal view at 16:9 has a vertical field of view of about 58.7155°. A square view keeps both angles equal.

Next: Mouse sensitivity converter

Before you use the result

Angles must be greater than 0° and less than 180°. This does not convert fisheye, diagonal-FOV or non-rectilinear projections. Nonzero numeric inputs for these compound calculations are limited to 1e-40 through 1e40.

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ToolOctopus. “FOV converter.” Updated 2026-09-19. https://tooloctopus.com/fov-converter.

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