Credential evaluation services convert a foreign transcript into a US-equivalent GPA by mapping each grade to a US letter grade and point value using country-specific and often institution-specific equivalency tables, converting foreign credit units to US semester-credit-hour equivalents, and then applying the standard credit-weighted GPA formula — the same process any US registrar uses, just built on a translated data set.
Who performs these evaluations
In the United States, foreign credential evaluation is typically performed by independent, nonprofit or for-profit organizations rather than the receiving school itself, though some large universities also maintain in-house evaluation teams for their own admissions purposes. Many of the most widely recognized evaluators are members of the National Association of Credential Evaluation Services (NACES), a membership association that sets professional standards its member organizations agree to follow. World Education Services (WES) and Educational Credential Evaluators (ECE) are two of the more commonly requested services, but there are several others, and receiving institutions vary in which ones they'll accept.
The general conversion process
While each service has its own proprietary methodology and internal tables, the overall process follows a similar shape across evaluators:
- Document verification. The evaluator confirms the transcript is authentic, usually requiring it to arrive directly from the issuing institution or through an approved secure delivery channel, rather than accepting a copy submitted by the applicant alone.
- System research. The evaluator identifies the grading scale, credit system, and academic calendar used by the specific institution and country — this research underlies the country-specific equivalency tables that make the conversion possible.
- Grade conversion. Each course grade is mapped to a US-equivalent letter grade and point value, typically on a 4.0 scale, using the evaluator's equivalency table for that country and credential level.
- Credit conversion. Foreign credit units (which might be ECTS, a national credit system, or contact hours) are translated into an estimated US semester-credit-hour equivalent, since GPA weighting depends on credit hours, not just grades.
- GPA calculation. The converted grades and credit hours are combined using the standard formula, producing a cumulative converted GPA.
- Report issuance. The evaluator issues a formal report — often called a course-by-course evaluation when a converted GPA is included, as opposed to a simpler document-only or general evaluation that doesn't calculate a GPA.
Converted GPA = Σ(Converted Grade Points × Converted Credit Hours) ÷ Σ(Converted Credit Hours)
Why different grading cultures need different tables
A flat, one-size-fits-all conversion — for example, treating any percentage above 90% as an A everywhere — would misrepresent students from systems where grading is deliberately compressed at the top. In many countries, scoring above roughly 16 out of 20, or above 80%, is genuinely rare even for excellent students, because the grading culture reserves the highest marks for truly exceptional work rather than distributing them the way some US high schools do. Evaluators account for this with country-specific tables built from research into each system's actual grading distribution, rather than applying US grading norms globally.
| System Type | Example | Why a Flat Formula Fails |
|---|---|---|
| 0–20 point scale | France | Scores above 16 are uncommon; a 13–14 is a solid result, not average |
| 0–10 point scale | Netherlands, several Latin American countries | A "7" is often a strong grade, not a middling one |
| Percentage-based, high top-end | Some Asian and African systems | Top marks may be reserved for the very highest achievers only |
| Classification-based | UK (First, 2:1, 2:2, Third) | No per-course numeric grade at all — the whole system requires a different conversion approach |
Common differences between what evaluators produce
Even applying broadly similar methodology, two evaluators can produce a somewhat different converted GPA from the same original transcript, because their equivalency tables, credit conversion assumptions, and treatment of edge cases (repeated courses, failed and later-passed courses, pass/fail marks) aren't identical. This is one reason receiving institutions that require a specific evaluator do so deliberately — it keeps the conversion methodology consistent across all applicants from a given country, which matters for fair comparison in a competitive applicant pool.
Common edge cases
- Systems without letter grades or GPA at all. Some countries and institutions report performance narratively or as simple pass/fail, requiring evaluators to rely on supplementary documentation — see our guide on converting a narrative or pass-fail transcript to GPA.
- Degree classification systems. The UK's honours classification system (First, 2:1, 2:2, Third) reports one overall banded result rather than per-course grades, requiring a different conversion approach than a numeric scale — see our UK degree classification to GPA guide for specifics.
- Institutions that don't require external evaluation. Some US graduate programs evaluate foreign transcripts in-house and don't require (or even accept) a third-party service's report — always check each program's specific requirement before paying for an evaluation you may not need.
- Partial or incomplete transcripts. If a degree wasn't completed, or grades are missing for some terms, evaluators typically note this explicitly in the report rather than estimating a GPA from incomplete data.
Try it yourself
Once you have converted letter grades and credit-hour equivalents — whether from an official evaluation report or your own estimate using a country-specific conversion table — our GPA Calculator and CGPA Calculator can combine them into a single weighted average, calculated privately in your browser with no account or document upload required.
