About
About (日本語) – The fastest, most accurate online grade calculator suite. Calculate course averages, final exam score requirements, weighted categories, and GPA on a 4.0 scale with 100% privacy.
運営者情報 – 成績計算機
At Grade Calculator (gradecalculator.dev), we empower students, educators, and parents worldwide with fast, transparent, and mathematically rigorous academic calculation tools. Calculating semester averages, final exam score targets, and cumulative GPA should never require confusing spreadsheets or ad-cluttered websites that lag on mobile devices.
Our suite of 15+ calculators is built on modern web standards to ensure instant client-side execution, 100% browser-based data privacy, and zero server storage of personal grades.
Mathematical Rigor
Every calculation formula—from weighted harmonic contributions to decimal quality points—is verified and tested against standard institutional benchmarks.
Privacy-First Architecture
We never store, transmit, or monetize your coursework grades. All calculations execute directly in your browser's JavaScript runtime.
Always Free & Accessible
No paywalls, no forced logins, and no intrusive popups. Built to conform to modern WCAG accessibility guidelines.
Academic Community & Updates
Follow Grade Calculator across our official community channels for study tips, grading insights, and calculator releases.
標準学業評価スケール
パーセンテージ、評価ランク、4.0基準GPAクオリティポイント換算表。
標準学業評価スケール
評価基準スケール| 評価ランク | パーセント範囲 | GPA (成績評価値) | 学業成績ステータス |
|---|---|---|---|
| A+ | 97% – 100% | 4.0 | 優等生クラス |
| A | 93% – 96% | 4.0 | 優等生クラス |
| A- | 90% – 92% | 3.7 | 優等生クラス |
| B+ | 87% – 89% | 3.3 | 優秀合格 |
| B | 83% – 86% | 3.0 | 優秀合格 |
| B- | 80% – 82% | 2.7 | 優秀合格 |
| C+ | 77% – 79% | 2.3 | 優秀合格 |
| C | 73% – 76% | 2.0 | 優秀合格 |
| C- | 70% – 72% | 1.7 | 優秀合格 |
| D+ | 67% – 69% | 1.3 | 改善が必要 |
| D | 63% – 66% | 1.0 | 改善が必要 |
| D- | 60% – 62% | 0.7 | 改善が必要 |
| F | < 60% | 0.0 | 改善が必要 |
人気の成績計算ツール
履修計画や単位管理に役立つ専門計算機ツール集。
成績計算機
Calculate overall percentages, total points earned, and letter grades across all your coursework.
期末試験目標点数計算機
Find out the exact score needed on your final exam to pass the class or earn your desired letter grade.
加重成績計算機
Compute course grade when assignments, quizzes, midterms, and finals carry distinct category percentages.
4.0 GPA 計算機
Calculate high school and college grade point averages with credit hour weighting.
平均点計算機
Calculate the mathematical mean, median, highest, and lowest score across any set of grades.
小テスト採点計算機
Instant grading chart and test score checker for students and teachers.