MasterTool

FOV Calculator

Calculate fov from entered performance or equipment data.

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What this tool does

Calculate fov from entered performance or equipment data. Rectilinear projection; preserves vertical FOV when changing aspect ratio.

How to use the FOV Calculator

  1. Enter or select horizontal fov (degrees).
  2. Enter or select source aspect width.
  3. Enter or select source aspect height.
  4. Enter or select target aspect width.
  5. Enter or select target aspect height.
  6. Read the calculated result; change any measurement to compare alternatives.

Formula

vertical FOV=2 atan(tan(horizontal/2)/(w/h)); target horizontal=2 atan(tan(vertical/2)×newW/newH)
horizontal
Horizontal FOV (degrees)
w
Source aspect width
h
Source aspect height
newW
Target aspect width
newH
Target aspect height

Rectilinear projection; preserves vertical FOV when changing aspect ratio.

Worked example

For fov calculator, the following measurements illustrate the exact method: Horizontal FOV (degrees): 90; Source aspect width: 16; Source aspect height: 9; Target aspect width: 21; Target aspect height: 9.

Inputs

  • Horizontal FOV (degrees)90
  • Source aspect width16
  • Source aspect height9
  • Target aspect width21
  • Target aspect height9

Result

  • Vertical FOV (degrees)58.72
  • Target horizontal FOV (degrees)105.39

Results explained

Vertical FOV (degrees)
Vertical FOV (degrees) from the formula above. Rectilinear projection; preserves vertical FOV when changing aspect ratio.
Target horizontal FOV (degrees)
Target horizontal FOV (degrees) from the formula above. Rectilinear projection; preserves vertical FOV when changing aspect ratio.

Frequently asked questions

vertical FOV=2 atan(tan(horizontal/2)/(w/h)); target horizontal=2 atan(tan(vertical/2)×newW/newH)

Rectilinear projection; preserves vertical FOV when changing aspect ratio.

No. Verify competition rules, manufacturer guidance and measured conditions before relying on the estimate.

Each field identifies its required units. Do not mix game sensitivity scales, meters and yards, or grains and grams.

No. It is an entirely local calculation with no accounts or external data requests.