What is the difference between horizontal and vertical FOV?

Horizontal FOV measures the angle you can see from left to right; vertical FOV measures it top to bottom. Games disagree on which one their FOV slider controls — CS2, Valorant, Fortnite and most Unreal-engine titles use horizontal FOV, while Apex Legends, Overwatch 2 and Quake-lineage games use vertical. The same view shows a different number depending on which axis is measured, which is why a converter is needed to compare across games.

Does changing FOV change my sensitivity?

A wider FOV makes the same mouse movement sweep across more of the screen, so targets feel like they move faster even though your turn speed (cm/360°) is unchanged. FOV does not alter your real sensitivity, but many players slightly raise sens at very high FOV to keep the feel consistent. Match your cm/360° first, then adjust FOV to taste.

Why does my FOV look wider on a 21:9 ultrawide monitor?

Most shooters use "Hor+" scaling: they keep the vertical field of view fixed and extend the horizontal view to fill the extra width. So moving from 16:9 to 21:9 genuinely shows more to your left and right — a real peripheral-vision difference, not a stretch. Set the source and target aspect ratios in the converter to see the exact horizontal FOV at each.

What is Hor+ scaling?

Hor+ ("horizontal plus") means the game holds vertical FOV constant and widens the horizontal view as the aspect ratio grows. It is the standard in modern FPS games, including CS2 and Valorant, and is why wider monitors see more of the world rather than a zoomed or letterboxed image. The "same view at another aspect ratio" result below preserves your vertical FOV exactly, following this rule.

Is SensLab really free?

Yes — the core converter, crosshair generator, pro presets, and pro comparison tables are permanently free. We use Vercel's cookieless analytics to count page views; no ads, no sign-up, no personal data collection.

FOV Calculator & Converter

Convert field of view between horizontal, vertical and diagonal — and across aspect ratios. Pure trigonometry, no per-game guesswork.

Your FOV

Measured as

Aspect ratio

Field of view at 16:9 (1920×1080). Tap any value to copy.

Same view at another aspect ratio

Convert to

90° 16:9

Horizontal FOV that keeps your vertical view identical at 4:3 (1280×960). This is “Hor+” scaling — how CS2, Valorant and most modern shooters behave when you change resolution.

In short: games measure field of view on different axes — CS2 and Valorant use horizontal FOV, Apex and Overwatch use vertical. Enter your FOV, pick the axis and aspect ratio, and SensLab returns all three angles so you can match your view across games and monitors. The maths is exact trigonometry: 90° horizontal at 4:3 is 73.74° vertical, the value CS2 locks internally.

How do I convert FOV between games?

The blocker is that games measure FOV differently. CS2, Valorant, Fortnite and most Unreal-engine shooters report horizontal FOV; Apex Legends, Overwatch 2 and Quake-lineage games report vertical. Enter your number with the right axis and aspect ratio, and the converter gives you the horizontal, vertical and diagonal equivalent — read off whichever the other game expects.

Does a higher FOV change my aim?

A wider FOV packs more of the world into the same screen, so enemies look smaller and appear to move faster — but your actual turn speed is unchanged. Sensitivity and FOV are separate settings. If you want your aim to feel identical across games, match your cm/360° first with the sensitivity converter, then set FOV to taste.

Why is FOV wider on ultrawide monitors?

Modern shooters use Hor+ scaling: the vertical view stays fixed and the horizontal view widens to fill the extra screen. A 21:9 or 32:9 monitor genuinely shows more to the sides than 16:9 — a real peripheral advantage. The cross-aspect result above keeps your vertical FOV identical so you can find the matching horizontal number on any aspect ratio. Playing 4:3 stretched does the opposite — a narrower view with wider-looking models.

FOV Calculator & Converter

Same view at another aspect ratio

How do I convert FOV between games?

Does a higher FOV change my aim?

Why is FOV wider on ultrawide monitors?

Frequently Asked Questions