Gpakit Editorial — Gpakit

Gpakit Editorial is the small team that writes and maintains the explainers on this site. Our background sits across mathematics, registrar-side academic administration, and data journalism — the three specialties that tend to overlap when you want to describe a grade formula without either dumbing it down or burying it in jargon. Every calculator here is traced to a primary source before it ships, and the blog posts cite their references by name. Corrections come from readers on a regular basis; we keep a short changelog on the tools that have been materially revised and fix errors on the day we hear about them.

Posts by Gpakit Editorial

How GPA is actually calculated: the arithmetic behind your transcript

Most students have never seen the simple credit-weighted average hiding inside every semester GPA. Here is the math, worked step by step.

Weighted vs unweighted GPA: what colleges actually see

Admissions offices routinely recalculate your GPA their own way. Here is what that means for how you should think about AP and Honors courses.

SAT to ACT concordance: how the College Board conversion table works

The official 2018 concordance table is a percentile-rank crosswalk, not a direct score swap. Why that distinction matters for application strategy.

The Pomodoro technique: what the research actually says about 25-minute blocks

Timed work intervals can improve focus, but the optimal interval length depends on task type and individual working memory. Here is what the evidence supports.

Spaced repetition: the forgetting-curve math that makes flashcards work

Ebbinghaus's 1885 retention data still drives the interval formulas in every flashcard app. A plain walk through how SM-2 picks your next review date.

Minimum GPA requirements by college tier: a data-driven breakdown

Selective, target, and safety schools each carry distinct GPA floor expectations. How to read them honestly alongside test scores and course rigour.

The math behind "what do I need on my final?"

One straightforward weighted-average formula answers the single most-searched grade question in America every December and May.

Class rank and percentile: what the number on your transcript actually means

Class rank is a position; percentile is a ratio. Why the difference matters to admissions offices and how to read both on your own transcript.

How many hours should you actually study? The credit-hour rule, examined

The "two to three hours per credit hour per week" guideline has been around for a century. What does the evidence say about whether it is still right?

Saving for college: the compound-growth math that decides your 529

How a 529 plan turns $3,000 a year into six figures by the time a kindergartener graduates high school — and the assumptions that drive the number.

Significant figures in academic work: the rules that keep showing up on exams

Sig fig rules feel arbitrary until you realise they're a shorthand for measurement uncertainty. The five rules, explained with worked examples.

How AP exam scoring works: composite scores, score bands, and why predictions wobble

AP exams run on a weighted composite of multiple-choice and free-response sections, with cutoffs that shift each year. Here is how the math lines up.