FOV & Aspect Ratio Calculator

FOV Calculator

FOV stands for field of view. In video games, it determines how wide a portion of the virtual world you see at any moment. A narrow FOV feels zoomed in and tunnel-like, while a wide FOV feels expansive and gives you better peripheral awareness.

Most games let you adjust FOV in settings, but some express it as a horizontal angle and others as a vertical angle. The correct value for your monitor depends on its aspect ratio, which is where this calculator comes in.

Horizontal vs Vertical FOV

Horizontal FOV (hFOV) is measured along the width of your display. Vertical FOV (vFOV) is measured from top to bottom. The relationship between the two depends on the aspect ratio of your screen.

A 90-degree hFOV on a 16:9 monitor produces a vFOV of approximately 59 degrees. The same 90-degree value on a 21:9 ultrawide produces a much narrower vFOV because the screen is proportionally wider. This is why knowing your aspect ratio and using a converter matters when transferring settings between games or switching monitors.

How to Use the FOV Calculator

Select your aspect ratio from the dropdown. Enter your known FOV value in either the horizontal or vertical field. The calculator fills in the other value instantly. You can also enter your display resolution to calculate the aspect ratio automatically if you are unsure of it.

FOV Reference by Aspect Ratio

The table below shows the vFOV equivalent of a 90-degree hFOV across common monitor aspect ratios.

What FOV Should You Use?

For FPS games on a 16:9 monitor, 90 to 103 degrees horizontal is the most commonly recommended range. It provides a wide enough view to spot threats at the edges without distorting close-range geometry too much.

Ultrawide monitors benefit from higher horizontal FOV values to avoid feeling zoomed in. Sim racing games typically use a physically correct FOV calculated from your actual monitor size and viewing distance, which often produces values that feel lower than gaming norms.

Pair this with the mouse sensitivity converter when switching games, and use the aim trainer to practice with your new settings. Check your monitor refresh rate to make sure your display is running at full speed.

What Is Hor+ Scaling?

Hor+ (horizontal plus) scaling adds more horizontal view as the aspect ratio widens, keeping the vertical FOV constant. It is the standard for most modern games and rewards ultrawide monitor users with a wider view rather than a cropped image. When a game uses Hor+ scaling, entering the same vFOV value produces a wider picture on a 21:9 monitor than on a 16:9 monitor.

Frequently Asked Questions

What is the best FOV for FPS games?

For most FPS games on 16:9 monitors, 90 to 103 degrees horizontal is the most popular range. It varies by personal preference and viewing distance.

Does FOV affect performance?

A higher FOV renders more of the scene and can reduce frame rates slightly, especially on lower-end hardware. The impact is usually small on modern GPUs.

What is Hor+ scaling?

Hor+ scaling adds more horizontal view as the screen gets wider, keeping vertical FOV constant. Most modern games use Hor+ so ultrawide users see more of the scene rather than a cropped version.

Why do some games show different FOV numbers for the same setting?

Games use different FOV axes, horizontal or vertical, as their base measurement. A 90-degree setting in one game can feel different from 90 degrees in another if they use different axes.

Can this calculator be used for cameras and lenses?

Yes. The same hFOV to vFOV conversion math applies to camera lenses. Enter the lens horizontal angle of view and sensor aspect ratio to calculate the vertical equivalent.

What aspect ratio is 2560x1440?

2560x1440 is a 16:9 aspect ratio. It is a standard widescreen resolution widely used in gaming monitors.

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