FOV Calculator & Field of View ConverterHFOV ↔ vFOV

Q: What is the difference between Horizontal and Vertical FOV (vFOV)?

Horizontal FOV measures your camera view angle from the left edge of your screen to the right edge. Vertical FOV (vFOV) measures the angle from top to bottom. Games like Valorant (103°), Apex Legends, and Call of Duty use 16:9 Horizontal FOV. Games like Rainbow Six Siege, Battlefield (Bad Company 2, BF4, 2042), and Escape from Tarkov use Vertical FOV (vFOV).

Q: How do you convert 75 Vertical FOV to Horizontal FOV?

Using the formula HFOV = 2 * arctan(tan(VFOV / 2) * (16 / 9)), 75° Vertical FOV equals 106.26° 16:9 Horizontal FOV (and 90° on a 4:3 baseline). This is the exact default FOV found in CS2 and Source engine games.

Q: What is the Monitor Distance Coefficient in FPS gaming?

The Monitor Distance Coefficient (MDC) is a mathematical formula that scales your ADS (Aim Down Sight) zoom sensitivity so that flicking your crosshair to an on-screen target requires the exact same physical hand distance regardless of zoom magnification. The 75% coefficient (0.75) is the legacy default in CS2 and Call of Duty, while 0% (focal length scaling) matches smooth tracking.

Q: What is the realistic FOV for sim racing games like ACC, Forza, and ETS2?

Realistic sim racing FOV is calculated geometrically from your eye distance to the monitor and your screen width. For a 27-inch 16:9 monitor viewed from 65 cm away, the realistic true-perspective FOV is approximately 49.4° Horizontal FOV (28.9° Vertical FOV in Assetto Corsa Competizione).

Q: How do you convert 103 Valorant FOV to CS2 or Rainbow Six Siege?

Valorant's locked 103° 16:9 HFOV converts to 87.13° 4:3 HFOV in CS2, or 71.15° Vertical FOV (vFOV) in Rainbow Six Siege and Battlefield.

16:9 • 4:3 • 21:9 • vFOV

Quick Presets:

Input FOV (°)

Input FOV Scaling Type

16:9 HFOV103.0°

4:3 HFOV87.1°

vFOV (Vertical)71.2°

21:9 Ultrawide116.8°

Camera Projection ArcFocal: 1.32×

103.0° (16:9 HFOV)

Camera Perspective Engine

The Ultimate Game Field of View Calculator & vFOV Converter

Field of View (FOV) controls the angle of the virtual 3D game world displayed on your monitor. Different game engines use completely incompatible measurement methods: some express FOV horizontally across 16:9 widescreen displays (Valorant, Apex, CoD), others use 4:3 baselines (CS2, Source), and titles like Rainbow Six Siege, Battlefield (BF4, BC2, 2042), Escape from Tarkov, and ACC scale FOV vertically (vFOV).

Our field of view calculator pc gaming suite converts between 16:9 Horizontal FOV, 4:3 Horizontal FOV, 21:9 Ultrawide, and Vertical FOV (vFOV). It also calculates Monitor Distance Coefficients for ADS zoom sensitivity and realistic seating distance FOV for racing and tactical simulators (ACC, Forza, ETS2, Arma 3).

Core Capabilities

Instant Horizontal 16:9 ↔ Vertical FOV (vFOV) conversion
Monitor Distance Coefficient calculator (0%, 75%, 100%, 133%, 178%)
Sim racing realistic seating distance FOV (ACC, Forza, ETS2, Arma)
Focal length multiplier: 1 / tan(FOV / 2)

Calculates 16:9, 4:3, 21:9 Ultrawide, and Vertical FOV with live projection arc visualization.

Camera Projection Standards

Horizontal vs Vertical FOV (vFOV): The Mathematical Difference

1. Horizontal FOV (16:9)

Measures camera view angle from the left edge of standard widescreen monitors to the right edge. Used by Valorant (locked at 103°), Apex Legends, Call of Duty, Marvel Rivals, and Overwatch 2.

2. Vertical FOV (vFOV)

Measures camera angle from top to bottom. Used by Rainbow Six Siege (default 84° vFOV), Battlefield (55°–74° vFOV), Escape from Tarkov, and ACC. Vertical FOV remains invariant across ultra-wide aspect ratios.

3. Horizontal FOV (4:3 Baseline)

Measures horizontal angle on a legacy 4:3 resolution, then expands horizontally on widescreen displays. Used by Counter-Strike 2 (CS2) and Source engines (90° 4:3 equals 106.26° on 16:9 screens).

Conversion Trigonometry

Mathematical Formulas for FOV & Monitor Distance Conversions

Horizontal (16:9) to Vertical FOV Formula

Vertical FOV = 2 × arctan( tan( Horizontal FOV / 2 ) / ( 16 / 9 ) )

Vertical FOV to 16:9 Horizontal FOV Formula

Horizontal FOV (16:9) = 2 × arctan( tan( Vertical FOV / 2 ) × ( 16 / 9 ) )

Game / Scenario	16:9 Horizontal FOV	4:3 Horizontal FOV	Vertical FOV (vFOV)	21:9 Ultrawide FOV
Valorant (Locked)	103.00°	87.13°	71.15°	116.82°
CS2 Default (90° 4:3)	106.26°	90.00°	73.74°	119.78°
Apex Legends Pro (110°)	110.00°	93.92°	77.32°	123.08°
R6 Siege Default (84° vFOV)	116.63°	101.07°	84.00°	128.69°
Call of Duty Max (120°)	120.00°	104.70°	87.49°	131.39°

Frequently Asked Questions

Everything you need to know about game field of view scaling, vertical FOV, and monitor distance.

FOV Calculator FAQ

What is the difference between Horizontal and Vertical FOV (vFOV)?

How do you convert 75 Vertical FOV to Horizontal FOV?

What is the Monitor Distance Coefficient in FPS gaming?

What is the realistic FOV for sim racing games like ACC, Forza, and ETS2?

How do you convert 103 Valorant FOV to CS2 or Rainbow Six Siege?

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