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Calculators · trigonometry (no empirical factors)

📐 Field of view (FOV) calculator

When you change the monitor’s aspect ratio (for example, from 16:9 to ultrawide 21:9), games with horizontal FOV scaling feel different. This calculator converts the horizontal FOV between formats to keep your usual vertical view.

model estimate · data updated · methodology · Check my PC

Key figures

Unique FPSHQ metrics from this page's data

3
input parameters
open
formula
20
monitors in the catalog
106°
horizontal FOV at 90° vertical (16:9)
122°
the same at 21:9
142°
the same at 32:9

Horizontal FOV at 90° vertical for different aspect ratios

hFOV = 2·atan(tan(vFOV/2) · aspect). The calculator formula: trigonometry without empirical coefficients.

0408012016090°4:3100°16:10106°16:9122°21:9142°32:94:34:390°16:1016:10100°16:916:9106°21:921:9122°32:932:9142°

How the calculation works

What you enteraspect ratio, vertical/horizontal FOV
What you getFOV for another monitor
Basistrigonometry (no empirical factors)
formulaopen — Hor+ conversion (vertical FOV is kept): vFOV = 2·atan(tan(hFOV/2) ÷ A₁), new hFOV = 2·atan(tan(vFOV/2) × A₂), where A is the aspect ratio (16:9 = 1.778; 21:9 ≈ 2.37). Pure trigonometry, no empirical coefficients; games that scale differently (Vert−) behave otherwise.
In short

Field of view (FOV) calculator

When you change the monitor’s aspect ratio (for example, from 16:9 to ultrawide 21:9), games with horizontal FOV scaling feel different. This calculator converts the horizontal FOV between formats to keep your usual vertical view.

monitors in the catalog
20
horizontal FOV at 90° vertical (16:9)
106 °
the same at 21:9
122 °
the same at 32:9
142 °
updated · source: FPSHQ graphics card catalog, FPSHQ monitor catalog, FPSHQ model estimate

Frequently asked questions

What are Hor+ and Vert- scaling?
Hor+ (horizontal expansion): on a wide monitor you see more on the sides while the vertical view stays the same. This is the correct mode. Vert- crops the top and bottom: on an ultrawide you see less, which is a drawback.
What FOV is comfortable?
For first-person shooters on 16:9, 90–106° horizontal is usually comfortable. Lower values give a tunnel effect, higher ones noticeable distortion at the edges.
How accurate are the FPSHQ calculators?
The calculators use open formulas with coefficients from the FPSHQ database (1,927 GPUs with measurements). The result is an estimate: real FPS depends on the CPU, settings and driver version. For an exact measurement use the FPSHQ app.
Do I need to sign up?
No. All calculations run in the browser. An account is only needed to save "My PC" and get personalised results across the site.
Which calculator should I use if a game stutters?
Start with "Target FPS" — it shows how far the GPU falls short; then "DLSS/FSR" — how much upscaling will give; if VRAM is short — "VRAM". For an upgrade — "Cost per frame".

Methodology and sources

This page uses the FPSHQ database: the GPU and CPU catalogue with synthetic benchmark scores, official game system requirements, FPS measurements from users of the FPSHQ app and the FPSHQ performance model. Calculated values are estimates, not a measurement of your exact configuration: the real result depends on drivers, settings and the rest of the hardware. More about the methodology →

Sources:
FPSHQ Team · Data updated