Grade Calculator

What this calculator does

Most math & education tools bury the answer under ads and jargon. The grade calculator shows the number first, the breakdown next, and the assumptions in plain language.

A grade calculator turns individual assignment scores and their weights into your overall class grade, and shows exactly what score you need on the final exam to reach a target grade. It works for any grading scale where each item is worth a fixed percentage of the final grade — the standard system in US high schools and colleges.

Common mistakes

• Weights not summing to 100% (recheck the syllabus)
• Mixing points-based and percentage-based grading in the same run
• Forgetting the final exam is included in the total weight
• Rounding intermediate values — keep decimals until the end
• Assuming a 90% guarantees an A — check the school's cutoffs

When to use it

Use this at the start of a term to plan effort, mid-semester to see where you stand, and before finals to know exactly what you need. Also useful for teachers building syllabi and for negotiating extra-credit opportunities.

Pro tips for the Grade Calculator

• Use Print / PDF to export a clean, ad-free summary you can share with a client or advisor.
• The chart updates live — drag values up and down to build intuition for how the formula behaves.
• Change one input at a time to see which lever actually moves the answer the most.

Frequently asked questions

›How is a weighted grade calculated?

Multiply each score by its weight, sum the results, then divide by the total weight. Example: (88×20 + 92×20 + 78×20 + 85×20) ÷ 80 = 85.75%.

›What grade do I need on the final?

Enter your current scores and the final's weight — the calculator solves for the score you need on the final to hit your target overall grade.

›What's the difference between weighted and unweighted grades?

Unweighted treats every assignment equally (simple average). Weighted honours the syllabus — a 30% final counts far more than a 5% homework.

›How do letter grades map to percentages?

US standard: A 93–100, A− 90–92, B+ 87–89, B 83–86, B− 80–82, C+ 77–79, C 73–76, C− 70–72, D 60–69, F below 60. Individual schools vary — check the syllabus.

›How do I raise my grade fastest?

Focus on the highest-weighted upcoming items (usually the final and the biggest projects). A 10-point gain on a 25% exam moves your grade 2.5 points; a 10-point gain on a 5% quiz moves it just 0.5.

›Why does the calculator say a score above 100% is needed?

That means the target is mathematically unreachable given the weight remaining. Lower your target or seek extra credit.

›Does the Grade Calculator store the numbers I enter?

No. All math runs locally in your browser — nothing is sent to a server, and closing the tab discards the inputs unless you save them to favorites.

›Where does the formula come from?

The formula shown in the "How it works" section is the same one you'll find in standard math & education references — no proprietary tweaks or hidden weightings.

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