Search Ctrl K
Home / Tools
THE FEUTEX TOOLKIT

Subtitle Reading Load

Check character rate and available display time against a user-selected reading target.

Video workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaActual character rate = chars/duration; Duration at target rate = chars/target; Additional duration needed = max(0,chars/target-duration)

Worked example

Inputs

Displayed characters
84 characters
Display duration
4 s
Target reading rate
17 characters/s

Expected results

Actual character rate
21 characters/s
Duration at target rate
4.941176471 s
Additional duration needed
0.9411764706 s

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

How to use this tool

  1. Check character rate and available display time against a user-selected reading target.
  2. Set displayed characters, display duration, target reading rate in the indicated units.
  3. Calculate and compare actual character rate, duration at target rate, additional duration needed.

Try this example

{
  "chars": 84,
  "duration": 4,
  "target": 17
}

Accuracy and scope

User-defined reading-rate target, not an accessibility compliance assessment. Reading difficulty and shot changes still need editorial review.

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.