Same percentage, different stories depending on the scale.
Grade Scale Calculator
The same percentage can mean very different things depending on the grading scale. A 75% is a C in the US standard system, a 6 in the IB, and a First-class grade in the UK. This Grade Scale Calculator shows your percentage on four common scales at once so you can compare them in one glance — useful for exchange students, parents, and anyone working across education systems.
How it works
Each scale has its own cutoffs. This tool applies all four at once:
US standard: 90+ A, 80+ B, 70+ C, 60+ D, <60 F
US +/−: 93+ A, 90+ A−, 87+ B+, … 60+ D−, <60 F
IB (1–7): 85+ 7, 75+ 6, 65+ 5, 55+ 4, 45+ 3, 35+ 2, <35 1
UK honours: 70+ First, 60+ 2:1, 50+ 2:2, 40+ Third, <40 FailExample calculation
A student scores 75% on an essay. On four different scales that becomes:
US standard: C
US +/−: C
IB (1–7): 6
UK honours: FirstWho can use this
- • Exchange and study-abroad students
- • IB and AP students
- • UK students applying overseas
- • Parents comparing transcripts
- • Universities translating grades
Why use it
- • Four scales side by side
- • Instant comparison
- • Free, no signup
- • Mobile friendly
- • Useful for international applications
Side-by-side reference chart
| Percentage | US | US +/− | IB | UK |
|---|---|---|---|---|
| 95% | A | A | 7 | First |
| 85% | B | B | 7 | First |
| 75% | C | C | 6 | First |
| 65% | D | D | 5 | 2:1 |
| 55% | F | F | 4 | 2:2 |
| 45% | F | F | 3 | Third |
This calculator is useful for students, teachers, and international applicants who want to compare grading systems and quickly understand how one percentage may translate across different academic scales.
Common Questions About Grade Scale Calculator
What is a grade scale?
A grade scale is the set of cutoffs that turns a percentage into a letter, number, or class. Different countries and schools use different scales, so the same 75% can be a B in one system and a 6 in another.
Do all schools use the same grade scale?
No. Even within one country, schools vary. The US has both a straight 10-point scale and a +/− scale. The UK uses a class-based system, IB uses 1–7, and many other countries have their own variations.
Which grade scales does this calculator compare?
It shows your percentage on four common scales: US standard (A–F), US +/−, IB (1–7), and UK Honours (First, 2:1, 2:2, Third).
Can grade scales vary by school or country?
Yes, grade scales can vary by school, college, university, or country. For example, the US, UK, and IB systems may use different grading ranges, GPA scales, or letter-grade formats. That’s why the same percentage may translate differently depending on the grading system.
Is this calculator free?
Yes — completely free, no signup, and it works on phones, tablets, and desktops.
Why does the same percentage give different grades?
Because each scale was designed for a different education system. A 70% is a C− in the US +/− system but a First-class degree in the UK honours system.