About School Grade Calculators

Last updated June 5, 2026

I spent enough late nights working out “what do I need on the final?” that I built a calculator for it — plus the GPA and weighted-grade math students re-derive every term. Every formula is shown.

What’s on this site

Right now there are 6 calculators here: GPA Calculator, Final Grade Calculator, Weighted Grade Calculator, Grade Percentage Calculator, Cumulative GPA Calculator, and Study Time Calculator. Each one is a single-purpose tool that shows its formula, lists its assumptions, and runs on any device with no signup.

Why these are different

Most calculator sites hand you a number and hide the formula. Every tool here does the opposite: the exact formula, the assumptions, and a worked example are shown right on the page, so you can check the result instead of trusting it blindly. There’s no account, no paywall, and no signup.

How the math is kept honest

Each formula is shown in full and was independently re-derived and spot-checked against the calculator’s code. Reference values (typical rates, averages, rules of thumb) are labeled as approximate and are editable, so you can put in your own real numbers. These are grade estimates, not official academic figures — your school’s published grading policy and your instructor are the authority on your actual grade.

Found a mistake?

I’d genuinely like to know. Email [email protected] and I’ll fix it.