Accessibility and product usability measurements

Usability error severity workload calculator

Priority score is occurrence count times chosen severity weight divided by estimated effort. Weights are subjective; this does not replace impact assessment.

Your numbers

Use the units shown. Results update as you change valid inputs.

YOUR RESULT

Priority score is occurrence count times chosen severity weight divided by estimated effort. Weights are subjective; this does not replace impact assessment.

THE NUMBERS, EXPLAINED

How to use this calculator.

Priority score is occurrence count times chosen severity weight divided by estimated effort. Weights are subjective; this does not replace impact assessment.

Start with your inputs

Enter observed issue frequency counts, user-assessed severity weights, estimated repair effort (hours). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.

InputExample value
Observed issue frequency counts4,2,1
User-assessed severity weights1,3,4
Estimated repair effort (hours)2,3,4

A worked example

With the example inputs above, weighted issue burden by row is 4, 6, 4. Change the inputs to explore your own scenario.

All results for the example inputs above
ResultExample answer
Weighted issue burden by row4, 6, 4
Priority scores per repair hour2, 2, 1
Priority order (issue row numbers)1, 2, 3
Total repair effort (hours)9

How this is calculated

Weighted issue burden by row

Multiply occurrences by chosen severity weight.

Priority scores per repair hour

Divide weighted burden by effort.

Priority order (issue row numbers)

Sort descending score, keeping earlier row first for ties.

Total repair effort (hours)

Sum estimated repair hours.

Symbols and units
a
Observed issue frequency counts
b
User-assessed severity weights
c
Estimated repair effort (hours)

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

Priority score is occurrence count times chosen severity weight divided by estimated effort. Weights are subjective; this does not replace impact assessment.

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?

Weighted issue burden by row; Priority scores per repair hour; Priority order (issue row numbers); Total repair effort (hours). 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: Priority score is occurrence count times chosen severity weight divided by estimated effort. Weights are subjective; this does not replace impact assessment.

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 tutorials ↗

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 →