THE NUMBERS, EXPLAINED
How to use this calculator.
Caption starts must be ordered; adjacent caption intervals are compared. Speech segments are already matched to captions by the user.
Start with your inputs
Enter caption start timestamps (seconds), caption end timestamps (seconds), matching speech start timestamps (seconds). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Caption start timestamps (seconds) | 0,3,7 |
| Caption end timestamps (seconds) | 4,6,9 |
| Matching speech start timestamps (seconds) | 0,3.5,7 |
A worked example
With the example inputs above, adjacent caption gaps, negative for overlap (seconds) is -1, 1. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Adjacent caption gaps, negative for overlap (seconds) | -1, 1 |
| Caption start minus speech start (seconds) | 0, -0.5, 0 |
| Overlapping adjacent pairs (count) | 1 |
How this is calculated
Adjacent caption gaps, negative for overlap (seconds)
Subtract preceding caption end from next caption start.
Caption start minus speech start (seconds)
Subtract matched speech start from caption start; positive is delayed.
Overlapping adjacent pairs (count)
Count negative gaps between adjacent captions.
Symbols and units
- a
- Caption start timestamps (seconds)
- b
- Caption end timestamps (seconds)
- c
- Matching speech start timestamps (seconds)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Caption starts must be ordered; adjacent caption intervals are compared. Speech segments are already matched to captions by the user.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Adjacent caption gaps, negative for overlap (seconds); Caption start minus speech start (seconds); Overlapping adjacent pairs (count). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Caption starts must be ordered; adjacent caption intervals are compared. Speech segments are already matched to captions by the user.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →