LensCalc - online lens calculator

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Target Height  Metres (Used for Tables 1, 2, 3, 4 and 6) 
Target Distance  Metres (Used for Tables 3, 4 ,5 and 6)
Focal Length  Millimetres (Used for Tables 1, 3 and 5)
Lens V. Angle  Degrees (Used for Table 2 only)
Percent Required  Per Cent (Used for Table 4 and 6 only)
Camera Height  Metres (Used for Table 6 only)

Enter data above and click a table button to calculate

 

Table outputs are as follows:

  1. Camera distance needed to fill a percentage of the screen with an object (i.e. person), from the lens focal length.
  2. Camera distance needed to fill a percentage of the screen with an object (i.e. person), from a lens angle.
  3. Percentage of a target on screen from the focal length of the lens and the distance of the target.
  4. Focal length needed to achieve a required target percentage on screen from the distance of the target.
  5. Scene size on a monitor from the scene distance and focal length of the lens.
  6. Area of view from camera height and lens angle, results show required downward angle and blind spots for multiple cameras.