GradeCalculators.org

Editorial Standards

Last reviewed May 2026

Why this page exists

Wrong grade and GPA calculations damage students. We hold every calculator on this site to a published standard so you can verify our work, challenge a number you think is wrong, and trust that we will correct it quickly when you are right. This page documents that standard.

Sources we use

Every formula on the site is cross-referenced against at least two of the following primary sources before publication:

  • The College Board. AP score conversion tables, SAT score ranges, percentile data, and credit-policy guidance. (AP Score Scale Table, CollegeBoard for Educators)
  • NCES. US Department of Education National Center for Education Statistics, used for grading-scale conventions and district-level data. (nces.ed.gov)
  • University registrar pages. Each university-specific GPA calculator cites the registrar URL it was built from. We do not paraphrase policy from third parties when the registrar publishes the policy directly.
  • WES (World Education Services). International credential conversions, used for country-GPA calculators and CGPA-to-GPA conversions. (wes.org)
  • AACRAO. American Association of Collegiate Registrars and Admissions Officers, used for plus/minus grading conventions and standard grading-scale variations.
  • LSAC, AAMC, CASPA. Domain-specific authority for law, medical, and PA school GPA calculators respectively.

We do not cite vague "industry standards" or unbranded aggregator sites. If we cannot find a primary source, the page does not ship.

Review cadence

  • Tier 1 calculators (Grade Calculator, GPA Calculator, Final Grade, and the other foundational tools) are audited every six months against current registrar and College Board guidance.
  • Tier 2 hubs and spokes (test-score calculators, AP score calculators, country-GPA calculators) are audited annually or whenever the issuing authority changes the test format or scoring rubric.
  • Programmatic spokes (one-of-many pages auto-generated from a template, such as /grade-percentage/16-out-of-20-as-a-percentage/) inherit the audit date of their template. The template is reviewed on the same cadence as a Tier 2 hub.

Each calculator page footer carries a "Last reviewed" date that reflects the most recent editorial pass. If you are about to use a calculation in a high-stakes context, check the date and verify against your registrar.

Correction policy

We commit to investigating every error report within 48 hours of receipt. If the report is correct, we publish a fix and bump the "Last reviewed" date on the affected page. If the report is incorrect, we reply with the source we used and the test cases that informed the formula.

Errors are tracked publicly through the contact pipeline; we do not silently modify formulas without updating the page review date. Major corrections that would change a previously-published number are noted in a brief footer line on the affected page for at least six months after the correction.

What we will not do

  • Hide a known error. If a formula is wrong, we publish the fix and date the change.
  • Cite generic "registrar standards." Every claim links to a specific source.
  • Use AI-generated content without human review. Drafts may be machine-assisted, but a human editor reviews every published page against primary sources before it goes live.
  • Publish a programmatic page without unique data. If a university uses the standard 4.0 A-F scale with no unique policies, it is listed in a directory rather than getting its own page.

Reviewer profile

Page reviews are conducted by an in-house editorial team with backgrounds in academic administration and content engineering. Reviewers consult the relevant primary sources and verify every test case in the calculator's published worked examples before signing off.

For privacy reasons we do not surface individual reviewer names; the editorial process is the public commitment. Institutional, academic, or media inquiries can request reviewer attribution through the contact page.

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