Education

These are the everyday maths tools: percentages, marks and averages, standard deviation, and grades on the 4.0 GPA scale. Every one of them prints its formula on the page and works through an example, so a result can be checked by hand rather than taken on trust.

The GPA calculator follows the 4.0 scale used by most Tanzanian and East African universities, where each grade carries both a point value and a credit weighting. If your institution uses a different scale, compare the formula on the page before relying on the total.

This is the one hub on the site that publishes no Tanzanian figures and cites no authority, and that is deliberate. Nothing here is a rate set by a regulator: a percentage, a mean, a standard deviation and a date difference are arithmetic, and a GPA is whatever scale the institution has adopted. Attaching a source to a calculation like that would look like authority without being any. The GPA tool states the 4.0 scale it uses and the formula it applies, so you can see at a glance whether it matches your own college's rules — and if it does not, the formula is the part to compare, not the total.

What these tools are good for is the arithmetic that surrounds study and paperwork: working out what mark is needed to lift an average, what a weighting does to a final grade, how much a set of numbers varies around its mean, and how many days lie between two dates — a tenancy, a notice period, a project deadline, an exam timetable.