THE NUMBERS, EXPLAINED
How to use this calculator.
Add the bit values for each required/available alternative. Requirements are supplied for each asset; existence does not establish content quality or conformance.
Start with your inputs
Enter required media alternatives bitmask (captions=1, transcript=2, description=4), available media alternatives bitmask (same codes). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Required media alternatives bitmask (captions=1, transcript=2, description=4) | 3,5,2 |
| Available media alternatives bitmask (same codes) | 1,5,0 |
A worked example
With the example inputs above, missing alternative bitmask per media row is 2, 0, 2. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Missing alternative bitmask per media row | 2, 0, 2 |
| Media rows with missing alternatives | 1, 3 |
| Assets with all recorded alternatives (%) | 33.333333 |
How this is calculated
Missing alternative bitmask per media row
Remove available bits from each required alternatives mask.
Media rows with missing alternatives
Select assets with at least one missing required bit.
Assets with all recorded alternatives (%)
Divide complete recorded inventories by all assets.
Symbols and units
- a
- Required media alternatives bitmask (captions=1, transcript=2, description=4)
- b
- Available media alternatives bitmask (same codes)
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
Add the bit values for each required/available alternative. Requirements are supplied for each asset; existence does not establish content quality or conformance.
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?
Missing alternative bitmask per media row; Media rows with missing alternatives; Assets with all recorded alternatives (%). 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: Add the bit values for each required/available alternative. Requirements are supplied for each asset; existence does not establish content quality or conformance.
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
W3C WAI Audio and Video Media ↗
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 →