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THE FEUTEX TOOLKIT

Projection Throw Geometry

Calculate image width, height and diagonal from throw distance and lens ratio.

Photography workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaImage width = distance/ratio; Image height = distance/(ratio*aspect); Image diagonal = distance/ratio*sqrt(1+1/aspect**2)
Sources and model references

Worked example

Inputs

Throw distance
4 m
Throw ratio
2
Image width/height
1.7777777777777777

Expected results

Image width
2 m
Image height
1.125 m
Image diagonal
2.294694969 m

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Calculate image width, height and diagonal from throw distance and lens ratio.
  2. Set throw distance, throw ratio, image width/height in the indicated units.
  3. Calculate and compare image width, image height, image diagonal.

Try this example

{
  "distance": 4,
  "ratio": 2,
  "aspect": 1.7777777777777777
}

Accuracy and scope

Uses manufacturer throw ratio and assumes a rectangular image without digital keystone correction.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.