A client's support coordinator has handed you a draft service agreement and asked whether it's realistic to expect the client to read and understand it independently before deciding how much support to build in around it.
FK Grade = 0.39×(words/sentences) + 11.8×(syllables/words) − 15.59
The FK Grade Level is mapped to an approximate Australian Core Skills Framework (ACSF) literacy band, reframed around everyday functional tasks relevant to disability and health support (reading service agreements, medication labels, appointment letters) rather than school year level.
1 What this calculator does
Estimates the reading difficulty of any text sample and maps it to an approximate functional literacy band based on the Australian Core Skills Framework (ACSF), reframed around everyday tasks relevant to disability and health support work — such as reading NDIS plan summaries, medication labels or service agreements. Useful for judging whether a document is likely to be independently accessible to a client, or whether support/plain-language alternatives are needed.
2 Formula & professional reasoning
Flesch-Kincaid Grade Level = 0.39 x (Words/Sentences) + 11.8 x (Syllables/Words) - 15.59
Reading age (approx) = FK Grade Level + 5
ACSF band (approx): FK<=4 -> Level 3 | FK<=8 -> Level 4 | FK<=12 -> Level 5 | FK>12 -> Above Level 5
This tool uses the same underlying Flesch-Kincaid formula as school-based reading age tools, but reframes the output around functional, adult, everyday-task literacy rather than school year level — which is more relevant when judging whether an adult client can independently understand a service agreement, plan summary or medication label. The Australian Core Skills Framework (ACSF) is the standard used across Australian vocational, disability and community services contexts to describe adult functional literacy, making the output directly useful for allied health and disability support planning conversations.
3 Worked examples
⚠️ Illustrative example only — not clinical or professional instruction.
FK: 0.39x6.33 + 11.8x1.15 - 15.59 = 2.47+13.57-15.59 = 0.45 -> very low gradeFK: 0.39x16 + 11.8x1.7 - 15.59 = 6.24+20.06-15.59 = 10.7FK: 0.39x30 + 11.8x2.0 - 15.59 = 11.7+23.6-15.59 = 19.74 Sanity check
5 Common errors
| Error | Cause | Consequence | Fix |
|---|---|---|---|
| Testing only a heading or short excerpt | Pasting a title or a single short sentence rather than a full paragraph | FK score is unreliable and not representative of the whole document | Paste at least 100+ words from the body of the actual document, ideally from more than one section |
| Treating the ACSF band as a diagnosis | Using this tool's output to make claims about a specific client's literacy ability or capacity | This tool assesses text difficulty only — it says nothing about an individual's actual reading ability | Use formal, validated literacy assessment tools for individual client capability; use this tool only to assess document difficulty |
| Assuming plain language always means lower ACSF level | Assuming any document labelled 'easy read' or 'plain language' will automatically score low | Some 'plain language' documents still use long sentences or technical terms that push the FK score higher than intended | Always run the actual text through the calculator rather than relying on a document's label alone |
| Ignoring layout and visual support | Judging accessibility on text difficulty alone when the original document uses supportive images, icons or Easy Read formatting | Underestimates real-world accessibility of documents that use visual supports alongside text | Consider layout, images and Easy Read conventions alongside the FK/ACSF score — this tool measures text complexity only, not overall document accessibility |
6 Reference & regulatory links
7 Professional workflow
Common tools used alongside this one: