Weighted grade calculator
One box. Put each mark and what it is worth on its own line
— 72, 30 for 72% on something worth 30% — and the
weighted average comes out with the arithmetic shown.
This one runs on your own device. It is worked out in your browser, so there is nothing to send and nothing to log. Where a tool on this site does send something out, that page says so and names where it goes.
A weighted average is not an average of the marks
Marks of 72, 65 and 58 average 65. If they are worth 30%, 20% and 50% the weighted answer is 63.6, because the 58 counts for half of everything and the 72 for less than a third. The gap is only 1.4 points here, and it is the difference between a 2:1 and a 2:2 often enough to matter.
Every mark is multiplied by its weight, those are added up, and the total is divided by the weights added up. The reading shows all three steps with your own numbers, because the middle one is where people go wrong.
When the weights do not add up to 100
Halfway through a course they will not, and that is normal rather than an error. If you have done 30% and 20% of the marks, dividing by 50 rather than by 100 gives your average so far — which is the honest figure, and is usually higher or lower than where you will finish.
Dividing by 100 instead would treat everything you have not sat yet as a zero, which is a different and much more alarming number. The reading says which of the two it gave you and what the weights came to.
What you need on the rest
Set a target and say how much of the marks are still to come, and the reading works out what you would have to average on them. That figure is often over 100, and where it is, the page says the target is out of reach rather than printing a number nobody could get.
It is the most useful thing this page does and the least often offered. Knowing you need 71% on the exam is worth having; being told you need 101% is worth having sooner.
Where to go next
Two that do the neighbouring sums:
- percentage calculator — for a single mark rather than a weighted set
- averages and spread — when you want the shape of a whole set of marks
What this does not do
No letter grades and no GPA. A mark of 63.6 is a 2:1 in one place, a B in another and a 3.0 somewhere else, and those mappings are set by institutions rather than by arithmetic — a calculator that picks one is guessing about your university, not calculating.
Nor does it know your rules. Capped resits, dropped worst marks, module credits that are not percentages, and a pass mark you have to clear on each component separately are all real and all local. This does the weighted average; your handbook does the rest.