How International Grades Convert to a US GPA
Why formula conversions of international grades usually mislead, how credential evaluation actually works, and what applicants should do instead.
There Is No Universal Conversion Formula
Students moving between education systems often look for a single formula that turns their grades into a US GPA. No such formula exists in any official sense. Grading systems differ in scale, in distribution, and in what a given number is supposed to mean. Credential evaluators and universities each publish or apply their own conversions, and two evaluators can reasonably reach different results for the same transcript. Any mapping you see online, including the ones in this guide, is an approximation, not a rule.
Why Direct Formula Conversion Usually Fails
The most common mistake is linear rescaling: taking a percentage or a score, dividing by the maximum, and multiplying by 4. That treats every grading scale as if grades were spread across it the same way. They are not. A UK examiner who awards 75% is describing exceptional work, because most UK marks cluster between 50% and 70%. A US instructor who records 75% is describing a C, because most US course grades cluster in the 80s and 90s. A linear formula maps both to the same GPA and gets at least one of them badly wrong.
Grade inflation patterns differ too. Average awarded grades have drifted upward in many US institutions over recent decades, while some systems still grade to a curve or reserve the top band for rare work. Comparing raw numbers across those cultures without context rewards the more generous system and penalizes the stricter one.
How Credential Evaluation Actually Works
When a US university needs a converted GPA, it usually relies on a credential evaluation rather than a formula. Services such as World Education Services (WES) and Educational Credential Evaluators (ECE) offer course-by-course evaluations: an evaluator reviews the issuing institution, assigns a US credit value and a US grade equivalent to each individual course, and computes a GPA from those equivalents. The evaluator draws on documentation about the source country's system, not on a one-line formula.
Many universities skip third-party services and evaluate transcripts in-house, using their own internal equivalency tables. Others require a specific service by name. The practical consequence is the same transcript can produce different converted GPAs depending on who evaluates it, and only the evaluation the university itself accepts counts.
What Applicants Should and Should Not Do
- Follow each program's instructions exactly. If an application asks for grades in the original system, report them in the original system.
- Do not self-convert unless instructed. Entering a homemade GPA on an application can look like misrepresentation even when the intent was helpful.
- Budget time for evaluation. Course-by-course reports require official documents and can take weeks once the service has everything.
- Keep estimates private. Rough conversions are useful for deciding where to apply, not for filling in forms.
The one safe rule
The only conversion that matters is the one the receiving institution performs or accepts. Report your grades the way each application asks, and let the evaluator or admissions office do the converting.
What a Very Good Grade Looks Like Across Systems
The table below shows why raw numbers mislead. Each row is a grade that admissions readers in that system would consider very strong. The equivalences are typical approximations only; official conversions vary by evaluator and university.
Using CalcMyGrades as an International Student
Once you enroll at a US institution, your new grades follow US rules, and the calculators here work exactly as designed. Use the Grade Calculator to understand how a US syllabus weights assignments and exams, since weighted category grading may be unfamiliar. Use the College GPA Calculatorto track the GPA you build in the US, which is usually the number that matters for scholarships, academic standing, and graduate applications going forward. For understanding how your home system's grades are typically read, treat any converted number as a planning estimate, never as an official figure.
Frequently Asked Questions
Can I convert my international grades to a US GPA myself?
You can estimate for personal planning, but you should not report a self-converted GPA on an application unless the instructions tell you to. Most US universities either ask for grades in the original system or require a report from a credential evaluation service, and each institution applies its own official conversion.
What is a course-by-course credential evaluation?
It is a report in which an evaluation service reviews each course on a transcript individually, assigns a US credit and grade equivalent to each one, and computes a GPA from those equivalents. Services such as WES and ECE offer this format, and it is the type most graduate programs request when they want a converted GPA. Different services can reach different results for the same transcript.
Why is a 75% mark not the same everywhere?
Because grade distributions differ. In many UK universities, marks above 70% signal top-of-class work, while a 75% in a typical US course is around a C. A percentage only has meaning inside the grading culture that produced it, which is why linear rescaling between systems usually misleads.
Do US universities accept evaluations from any service?
No. Many universities name the specific services or memberships they accept, and some do all evaluation in-house and refuse third-party reports entirely. Always check each program's application instructions before paying for an evaluation.