Home Theater Calculator

Welcome! Use this page to determine the appropriate viewing distance for your home theater.


  • Select a Unit System and Screen Resolution.
  • Enter your HDTV's Screen Diagonal.
  • Viewing distance is calculated and update automatically.
  • Visual Acuity Viewing Distance is the distance at which pixels become noticable with 20/20 vision.
  • THX recommends a 36 degree or larger side-to-side viewing angle and requires at least 26 degrees.
Unit System
Screen Resolution
Screen Diagonal:
Vertical Resolution:
Horizontal Resolution:
Number of Pixels:
Screen Width:
Screen Height:
Pixel Width:
Pixel Height:
Screen dimensions image
Suggested Viewing Distance
THX Max Allowable Viewing Distance:
THX Max Recommended Viewing Distance:
Visual Acuity Viewing Distance (20/20 vision):
Screen dimensions image