THE NUMBERS, EXPLAINED
How to use this calculator.
Flags upward heading-level jumps and missing/multiple main landmarks from supplied inventory. Returning to a lower level is allowed; this is a structural review aid, not WCAG certification.
Start with your inputs
Enter heading levels in document order (1 through 6), present main landmarks (count). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Heading levels in document order (1 through 6) | 1,2,4,2,3 |
| Present main landmarks (count) | 1 |
A worked example
With the example inputs above, heading rows skipping a deeper level is 3. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Heading rows skipping a deeper level | 3 |
| Level-one heading count | 1 |
| Main-landmark inventory status | One main landmark recorded |
How this is calculated
Heading rows skipping a deeper level
Flag a heading more than one level deeper than the preceding heading.
Level-one heading count
Count supplied h1 headings.
Main-landmark inventory status
Compare main landmark count with one.
Symbols and units
- a
- Heading levels in document order (1 through 6)
- b
- Present main landmarks (count)
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
Flags upward heading-level jumps and missing/multiple main landmarks from supplied inventory. Returning to a lower level is allowed; this is a structural review aid, not WCAG certification.
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?
Heading rows skipping a deeper level; Level-one heading count; Main-landmark inventory status. 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: Flags upward heading-level jumps and missing/multiple main landmarks from supplied inventory. Returning to a lower level is allowed; this is a structural review aid, not WCAG certification.
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 Page Structure: Headings ↗
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 →