Free tools
Small things we needed ourselves. No sign-up, no email, nothing stored — they work in the browser and the answer is on the page.
Attendance percentage calculator
Sessions attended over sessions possible, with what the figure means against the thresholds English schools use — including why an authorised absence still counts.
How many days can you miss?
The same arithmetic the other way round. Ninety per cent of a school year sounds respectable until you hear it as four weeks.
Grade percentage calculator
Marks into a percentage, plus what is still needed on the paper to come. It will not guess at a grade, because boundaries move every year.
Random group generator
Paste a class list, get even groups. The names never leave your browser.
Reading, not calculating
Two things the calculators keep pointing at, written out properly.
Authorised vs unauthorised absence
Who decides, what each usually covers, and why authorising an absence does not improve the attendance percentage.
What persistent absence means
The 90% threshold in days rather than percentages, and why it is measured over a term.