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How a British degree is classified
British undergraduate degrees do not produce a grade point average. They produce a classification, and there are only four of them worth having: First Class Honours at seventy and above, Upper Second — universally called a two one — from sixty to sixty nine, Lower Second or two two from fifty to fifty nine, and Third Class from forty to forty nine. Below forty the degree is not awarded with honours.
The gap between a two one and a two two matters more than the ten marks suggest. A great many graduate programmes and employer schemes set a two one as a hard minimum and filter on it before a human reads the application, which means a fifty nine and a sixty are treated as different kinds of candidate rather than as one mark apart.
Why the year weighting matters most
This is where a flat average gets British degrees badly wrong. Almost no university counts the three years equally. The most common arrangement on a three year course is that the first year is qualifying only and carries no weight at all, the second year carries forty percent and the final year sixty. Others use twenty five and seventy five, or thirty and seventy, and integrated masters courses spread the weight across four years differently again.
The practical consequence is that a poor first year genuinely does not matter at most institutions, and a strong final year is worth far more than a strong second year. The weights at the top of the calculator are set to the common zero, forty, sixty pattern, but they are editable, and your course handbook or programme specification is where the real figures live. It is worth ten minutes to find them, because using the wrong weighting can move a predicted classification across a boundary.
If a year has no marks entered yet, its share is redistributed across the years that do. That means the figure you see partway through a degree is your standing on the work completed so far, rather than a prediction dragged toward zero by a year that has not happened.
Credits, not modules
Within each year the modules are weighted by their credit value, not counted equally. A standard year is a hundred and twenty credits, typically as six twenty credit modules or a mixture of twenty and ten credit ones, and a final year dissertation is often forty credits by itself. That dissertation therefore carries the weight of two ordinary modules, which is why it deserves proportionate attention and why a single bad mark on a ten credit module is rarely worth losing sleep over.
Borderline rules and why the calculator flags them
Nearly every British university has a borderline policy, and it is one of the least understood parts of the system. If your weighted average falls within a couple of marks below a boundary — a sixty eight point five against a First, say — the examination board will usually look at whether enough of your credits already sit in the higher band, and can raise the classification on that basis. Some institutions use a preponderance rule requiring half your final year credits at the higher level, others apply discretion case by case.
The calculator tells you when you land inside that zone, because it changes what is worth doing. If you are two marks below a boundary with one assessment left, that assessment is the most valuable piece of work of your degree. If you are nine marks below, it is not, and your effort is better spent elsewhere.
Turning a classification into a GPA
The result card shows an approximate American grade point equivalent, because British graduates applying to American programmes are asked for one constantly. A First is generally read as a 4.0, a two one as around 3.7, and a two two as a 3.0. Treat these as indicative: American institutions vary, and most will ask for your transcript as issued rather than a figure you converted yourself. The percentage to GPA converter covers the same ground for seven other countries, and the GPA scale page explains how the American bands are built in the first place.