The UMS, or Uniform Mark Scale, is a grading system used primarily by British educational examiners. Examiners must take the raw marks on an exam and translate those marks to a UMS. According to the British newspaper The Independent, with the UMS, exams are graded as follows: above 80% is an A grade, 70% to 80% is a B, 60% to 70% is a C, and 50% to 60% is a D. The Oxford, Cambridge, and RSA examinations companies provides guidelines on how to calculate the UMS.

Find out which grade you scored on the exam: A, B, C, D or F. Example: you score a 72 on an Advanced GCE Art exam in 2009 and obtain a grade of C in unit F410.

Look at the UMS/raw score table for your type exam and determine how many raw marks there are in that grade. According to The Oxford, Cambridge, and RSA examinations company, there were 10 raw marks in grade C for 2009.

Determine how many marks are in the same type of uniform mark grade. The Oxford, Cambridge, and RSA examinations company list 12 UMS marks in that grade.

Divide Step 3 by Step 2. 12/10= 1.2. Set this number aside for a moment.

Figure out how many raw marks you have scored over the raw mark boundary. The boundary, according to the chart, is 66. 72-66=6.

Multiply Step 4 by Step 5. 1.2 * 6 = 7.2

Add Step 6 to the grade's uniform mark boundary. The boundary is listed in the chart as 72. 72 + 7.2 = 79.2. Your UMS mark is 79.2 (C grade).