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Grade Calculator

Convert marks to letter grades with percentage breakdowns.

Best for: Predicting a final grade mid-term, or working out what you need on the final exam to reach a target.

Complete guide
Why this result happened View assumptions

Input

How it's calculated & sources
The Grade Calculator uses the standard method for this calculation. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.
Key assumptions
  • Weights sum to 100%

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Percentage = Marks / Total × 100

Grades: A ≥ 90%, B ≥ 80%, C ≥ 70%, D ≥ 60%, F < 60%.

Example

Math 85/100 = 85% (B), Science 72/100 = 72% (C), English 91/100 = 91% (A). Overall average = 82.7% (B).

Frequently asked questions

Can I change grade thresholds?+

This tool uses standard US grading. Your school may use different cutoffs.

What if subjects have different max marks?+

Each row uses its own total — the overall average is weighted by marks earned.

Continue your journey

Where people usually head next.

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CGPA Calculator
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SGPA Calculator
Semester Grade Point Average for a single term.
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Marks Percentage Calculator
Find percentage from obtained and total marks.

Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Grade?
A grade calculator works out your overall grade from each component's score and weight, and can tell you the score you need on what is left to hit a target.
Why does Grade matter?
A weighted average that reflects how much each assignment or exam counts — not a simple average of the scores.
How is Grade calculated?
Multiply each component's score by its weight, add those up, and divide by the total of the weights. To find the score you still need, set the overall result equal to your target and solve for the remaining item. Formula: Overall = sum(score x weight) / sum(weights).
What are common grade mistakes?
Weights that do not add up to 100% (or whatever your total is).
When should you use the Grade Calculator?
Predicting a final grade mid-term, or working out what you need on the final exam to reach a target.

What is the Grade Calculator?

A grade calculator works out your overall grade from each component's score and weight, and can tell you the score you need on what is left to hit a target.

How the Grade Calculator works

Multiply each component's score by its weight, add those up, and divide by the total of the weights. To find the score you still need, set the overall result equal to your target and solve for the remaining item.

Overall = sum(score x weight) / sum(weights)

What impacts results most

  1. 1.
    Scores (High impact)Your marks on each component.
  2. 2.
    Weights (High impact)How much each component counts.

Key assumptions

  • Weights sum to 100%

Percentage to letter grade (common US scale)

90–100A4.0
80–89B3.0
70–79C2.0
60–69D1.0
Below 60F0.0

Key terms

Weighted average:
An average where each value counts in proportion to its weight.

Common mistakes to avoid

  • Weights that do not add up to 100% (or whatever your total is).
  • Mixing percentages with raw points across components.
  • Forgetting a dropped-lowest-score rule if your class has one.
  • Rounding each step instead of only at the end.

Keywords: grade, marks, letter.

Sources: General academic grading guidance

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Grade Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Grade Calculator?+

Grade Calculator uses the standard grade formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Grade Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Grade Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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Likely next step

🎓GPA CalculatorTop match📊CGPA CalculatorCumulative GPA across all semesters weighted by credits.📋SGPA CalculatorSemester Grade Point Average for a single term.％Marks Percentage CalculatorFind percentage from obtained and total marks.📅Attendance CalculatorCalculate attendance percentage and how many classes you can miss.📚Study PlannerPlan study hours across subjects based on topics and days left.

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Calculate the GPA you need in remaining courses to hit your target.

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Plan study hours across subjects based on topics and days left.
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Cumulative GPA across all semesters weighted by credits.
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Title: I built/used this free grade calculator — instant, no signup

Body: Convert marks to letter grades with percentage breakdowns. Try it: https://freetoolsgalaxy.com/tools/grade-calculator
LinkedIn post
Grade Calculator on Free Tools Galaxy — Convert marks to letter grades with percentage breakdowns. https://freetoolsgalaxy.com/tools/grade-calculator
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# Grade Calculator — the free tool I keep coming back to

Convert marks to letter grades with percentage breakdowns.

Try it: https://freetoolsgalaxy.com/tools/grade-calculator
Quora answer
The fastest way is to use a free in-browser grade calculator: https://freetoolsgalaxy.com/tools/grade-calculator. Convert marks to letter grades with percentage breakdowns.

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[Grade Calculator — free online tool](https://freetoolsgalaxy.com/tools/grade-calculator)

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Title
I built a free grade calculator that works instantly in the browser — no signup, no ads in your face
Body
Hey r/[subreddit],

I kept needing a quick grade calculator and most options online were slow or behind paywalls, so I built one that:

• Runs 100% in your browser (your data never leaves your device)
• No signup, no email wall, no popups
• Loads in under a second on mobile

It covers the standard grade use cases (grade, marks, letter) and links out to the formula + worked examples if you want to learn the math.

Link: https://freetoolsgalaxy.com/tools/grade-calculator

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