About the Exam Grade Boundary Calculator
This exam grade boundary calculator converts a raw mark into a grade using whatever boundaries you paste in — A-level, GCSE 9–1, IB component boundaries, a university module or a mock exam marked against last year’s thresholds. Enter your raw mark, the total marks available and the minimum mark for each grade, and it tells you the grade you achieved, how comfortably you cleared it and exactly how many marks you need for the next grade up.
Students use it after a mock to see how close they were to the next grade, and teachers use it to apply published boundaries to a whole set of past papers. Because boundaries change every exam series, the calculator does not assume any official figures: the default boundaries are illustrative only, so replace them with the ones your exam board publishes for the right paper and year.
Type one grade per line or separate them with commas, in any order, for example "A* 193" or "A: 165". A mark exactly on a boundary earns that grade, and any mark below the lowest boundary gets the label you choose, such as U for ungraded.
How to use the exam grade boundary calculator
- 1Enter your raw mark and the total marks available.
- 2Paste the grade boundaries for your paper, one grade and mark per line.
- 3Set the label for marks below the lowest boundary (for example U).
- 4Read your grade and the marks needed for the next grade.
- 5Use the table to see the gap to every higher grade.
Formula and method
Boundaries are the minimum raw marks needed for each grade. The calculator sorts them from highest to lowest and awards the first grade whose boundary your mark meets or beats, so a mark exactly on a boundary earns that grade. Below the lowest boundary the result is the label you choose, usually U (ungraded).
Marks needed for the next grade is the next boundary up minus your mark; the margin above shows how far you cleared your own grade. Exam boards set boundaries after marking each series so that standards stay comparable when papers vary in difficulty, which is why the same raw mark can earn different grades in different years.
- mark
- Your raw mark
- boundary(g)
- Minimum mark for grade g
- total
- Maximum marks available
Worked examples
147 out of 240 with illustrative A-level boundaries
147 is at or above the B boundary of 136 but below the A boundary of 165, so the grade is B with 11 marks to spare. Another 165 − 147 = 18 marks would reach an A. As a percentage, 147 ÷ 240 = 61.25%.
Top grade achieved
200 clears the A* boundary of 193 by 7 marks. A* is the highest grade listed, so no further marks are needed.
Below the lowest boundary
40 marks is below the E boundary of 51, so the result is U (ungraded). Eleven more marks would have secured an E.
GCSE-style 9–1 boundaries out of 100
58 meets the grade 6 boundary of 50 but is one mark short of the grade 7 boundary at 59, so the student gets a 6 and needed just 1 more mark for a 7.
Frequently asked questions
What are grade boundaries?+
Grade boundaries are the minimum raw marks needed for each grade on a particular exam paper. Exam boards set them after marking, so they can move up or down from one exam series to the next.
Why do grade boundaries change every year?+
Papers vary slightly in difficulty. Boards adjust boundaries so that a grade represents a similar standard each year — a harder paper usually has lower boundaries and an easier one higher boundaries.
Where can I find official grade boundaries?+
Each exam board (for example AQA, Pearson Edexcel, OCR, WJEC and Cambridge) publishes boundaries for every qualification and series on its website on or shortly before results day.
Does a mark exactly on the boundary get the higher grade?+
Yes. A boundary is the minimum mark for that grade, so a mark equal to the boundary earns the grade. One mark below falls into the grade beneath.
Can I use last year’s boundaries to predict my grade?+
They give a reasonable estimate for a mock or past paper, but treat the result as approximate because this year’s boundaries may be several marks different.