Grade to Letter Grade Calculator
Convert a percentage grade to a letter grade across US, UK, India, Australia, and GPA scales.
Did this tool work for you?
How to use this calculator
- 1
Enter your percentage score.
- 2
Select the grading scale used by your institution or country.
- 3
See your letter grade, grade point, description, pass/fail status, and cross-scale equivalents.
Frequently asked questions
Why does 72% give different grades on different scales?
Each scale in the tool has its own cut-offs. 72% is a C (2.0) on the US Standard scale, a First on the UK scale, B+ (8/10) on the India scale, a C (Credit, 5) on the Australia scale and a C− (1.7) on the 4.0 GPA scale. The tool applies fixed thresholds to the same number, so a different table gives a different letter, not an error.
What are the exact cut-offs the tool uses?
US Standard: A 90, B 80, C 70, D 60, below that F. UK: First 70, 2:1 60, 2:2 50, Third 40, below that Fail. India: O/A+ 90, A 80, B+ 70, B 60, C 50, P 40. Australia: HD 85, D 75, C 65, P 50. GPA 4.0 scale: A 93, A− 90, B+ 87, B 83, B− 80, C+ 77, C 73, C− 70, D+ 67, D 63, D− 60. These are the tool’s conventions; your institution may use different ones.
How are decimals and out-of-range scores treated?
The score is compared as entered with no rounding, so 89.9 is a B on the US Standard scale (the A starts at 90), and a B+ on the 4.0 scale (the A− starts at 90). Scores above 100 are treated as 100 and below 0 as 0. The starting value is 78, but clearing the box counts as 0, and a score of 0 is treated as a real score of 0.
Is the “Equivalent in other scales” line reliable?
Only as a rough hint. It is a set of hard-coded text labels per scale, and the labels are not symmetric: 72% on the US scale suggests “UK 2:2 or above”, while 72% on the UK scale suggests “US A”. They disagree because marking cultures differ, so use official conversion services or an institution’s published table for applications.
What is the grade point column for the UK and Australia?
For the UK scale it prints equivalents of 4.0, 3.3, 2.7 and 2.0 (marked “equiv.”) for First, 2:1, 2:2 and Third. For Australia it prints 7 for HD, 6 for D, 5 for C and 4 for P. Neither is an official GPA formula; they are the tool’s own mappings. A fail prints 0.
Does it calculate a GPA from several courses?
No. It converts one percentage on one scale. To get a cumulative GPA you need each course’s grade point and credit weight, and this tool has no inputs for credits or for averaging.
Does it handle plus and minus grades or an A+?
Only the 4.0 GPA scale has plus and minus steps, and it has no A+; 100% is an A worth 4.0. The US Standard scale has the five whole letters A to F, and the India scale labels its top band “O / A+”.
Percentage-to-grade conversion rules used
Five lookup tables, one input
The converter takes a single percentage and compares it against the thresholds of the scale you pick, from the highest band downwards. The first band the score reaches is the result, and a pass or fail flag follows from a fixed pass mark: 60 on the US scales, 40 on the UK and India scales, and 50 on the Australia scale. A cross-scale hint is attached as plain text.
| Scale | Letter / class | Grade point | Description | Pass mark |
|---|---|---|---|---|
| US Standard | C | 2.0 | Satisfactory | 60 |
| UK degree | First (1st) | 4.0 equiv. | First Class Honours | 40 |
| India percentage | B+ | 8/10 | Very Good | 40 |
| Australia | C | 5 | Credit | 50 |
| GPA 4.0 scale | C− | 1.7 | Satisfactory | 60 |
Why 72% is a First but a C−
The same score lands on very different ends of the five tables, which is the main point of the tool. UK first-class honours begin at 70, so 72 is a First there, while the 4.0 scale’s C− band starts at 70 and ends below 73. On the US Standard scale 72 is a plain C because every band is a full ten points wide. Seeing all five results for one score makes it clear that a letter is meaningless until you know the scale behind it.
Boundary behaviour
Thresholds are inclusive at the bottom of each band and there is no rounding. The tool gave a B and a 3.0 for 89.9 on the US Standard scale, but B+ and 3.3 on the 4.0 scale, because the second has a band starting at 87. A score of exactly 90 would give an A on the first and A− on the second. If your school rounds scores first, round before entering the number.
Using the cross-scale hints
The last line of the result is a short text label such as “US A” or “UK 2:2 or above”. Treat it as orientation only. The labels are fixed per band and are not computed from each other, so converting back and forth will not return the starting grade. For admissions or visa paperwork, use the receiving institution’s own conversion guidance instead.
Choosing the right scale
Pick the scale that matches the document you are reading, not the country of the student. An Indian university transcript fits the India bands, while a US high school typically fits the US Standard bands, but individual schools often set their own cut-offs. If a marking scheme lists its boundaries, compare them with the tables above and prefer the published boundaries over the tool’s defaults.
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