What this is
GradeKit is an independent, free set of grade calculators for students and teachers. There is no company behind it and no funding round — it is a small static website, built and maintained by one person.
How the calculators are built
Every calculation runs as a plain JavaScript function in your browser. There is no server, no API call, and no database. The functions are covered by an automated test suite that runs on every change, and each page publishes the formula it uses so you can check the arithmetic by hand.
The percentage-to-letter mapping used across the site is published in full on the grading scale chart. It follows the common U.S. plus/minus scale. Schools set their own cutoffs, so your syllabus always outranks anything here.
What GradeKit will not do
It will not ask you to create an account, will not email you, and will not store the numbers you type. It is not a gradebook, not a transcript, and not a substitute for what your instructor records. Every result is an estimate of what your official grade should be.
How the site is funded
The calculators are free and will stay free. Some outbound links to third-party study tools may earn a commission, which is disclosed on the affiliate disclosure page and marked wherever it applies. No calculator result changes based on a commission.
Reporting an error
If a calculator disagrees with your official grade, the cause is almost always a difference in weighting or rounding policy rather than a bug — but the formula on each page makes that easy to confirm. If the math itself is wrong, it should be reported and fixed.