GPA & study calculators that just do the math
GPA, grades, and study calculators that just give you the math.
This is a reference site for the arithmetic behind high school and college life. Weighted GPA, unweighted GPA, what you need on your final, SAT-to-ACT concordance, 529 growth projection — thirty-five calculators in all, and a dozen explainer posts that show the formula behind each one. Every tool here is one you could reproduce on a napkin once you know the inputs, and the site exists because that napkin work is usually faster and more honest than the search results above it. Nothing here is paywalled, nothing here tracks you beyond the advertising disclosed in the privacy policy, and nothing here personalizes. We do the math; the decisions are yours.
Most-used tools, if you need a starting point
These are the calculators readers land on most often — a mix of grade math, exam math, and admissions math that together cover the questions we see in our inbox week after week.
What's on Gpakit
Calculators
Thirty-five tools across GPA and grades, exam scoring, study planning, college admissions math, and the academic-arithmetic odds and ends that keep showing up on homework. Browse all →
Explainer posts
A dozen explainer posts that walk through the math behind the tools — how GPA is actually calculated, what the SAT-ACT concordance table is doing under the hood, why the Pomodoro 25-minute block is neither arbitrary nor magic. Read the blog →
Sources & accuracy
Every formula traces to a primary source and every limitation is stated on the page. We do not invent rules, and we do not personalize. More about our method →
Recent explainers from the blog
How we build these calculators
Every calculator on this site traces to a public, documented source — a registrar's handbook, a College Board PDF, a peer-reviewed paper, or a standard accreditation convention. When a tool extrapolates beyond that source (the AP score predictor, which depends on annually shifting cutoffs, is the clearest example), we say so in plain language on the page itself rather than tuck it into a footnote. The formula each calculator uses is printed in the explanatory prose below the form, not hidden inside JavaScript. Weighted GPA adds the standard +1.0 for AP and +0.5 for Honours, but your school's policy may differ; we flag that and link to the common variations where it matters. When a published rule changes — AP cutoff shifts, FAFSA Student Aid Index rules, 529 rollover provisions — we update the affected pages and note the revision in a short changelog. Readers email corrections regularly, and several of the calculators here exist in their current form because of those emails.