How to Use the Grade Calculator

This free grade calculator helps you determine your weighted average grade for any course. Here’s how to use it:

1. Add your assignments — Enter the name, score (as a percentage), and weight for each assignment, exam, or project.
2. Click “Calculate Grade” — The calculator will compute your weighted average, letter grade, and GPA equivalent on the 4.0 scale.
3. Use “What Do I Need on the Final?” — Enter your current grade, the final exam’s weight, and your desired grade to find out the minimum score you need on the final.

You can add unlimited assignments and remove any row by clicking the ✕ button. The weights don’t need to add up to exactly 100% — the calculator handles proportional weighting automatically.

How Weighted Grades Are Calculated

Weighted grades give different assignments different levels of importance. The formula is:

Weighted Average = Σ(Score × Weight) ÷ Σ(Weight)

This means each assignment’s score is multiplied by its weight, all weighted scores are added together, and then divided by the total weight. For example:

• Midterm (30% weight): Score 85% → 85 × 30 = 2,550
• Final (40% weight): Score 92% → 92 × 40 = 3,680
• Homework (20% weight): Score 88% → 88 × 20 = 1,760
• Participation (10% weight): Score 95% → 95 × 10 = 950

Total weighted score: 2,550 + 3,680 + 1,760 + 950 = 8,940

Total weight: 30 + 40 + 20 + 10 = 100

Weighted average: 8,940 ÷ 100 = 89.4% (B+ / 3.3 GPA)

Letter Grade to GPA Scale

The standard US grading scale converts letter grades to GPA points as follows: A+ and A = 4.0, A- = 3.7, B+ = 3.3, B = 3.0, B- = 2.7, C+ = 2.3, C = 2.0, C- = 1.7, D+ = 1.3, D = 1.0, D- = 0.7, and F = 0.0.

Practical Examples

Example 1: Simple Class Grade

A biology class has: Exams (60% weight) — you scored 78%, Labs (25% weight) — you scored 92%, Participation (15% weight) — you scored 100%. Your weighted average: (78×60 + 92×25 + 100×15) ÷ 100 = (4,680 + 2,300 + 1,500) ÷ 100 = 84.8% (B).

Example 2: What Do I Need on the Final?

Your current grade is 82% and the final exam is worth 35% of your grade. You want a B (83%). Using the formula: Needed = (83 − 82 × 0.65) ÷ 0.35 = (83 − 53.3) ÷ 0.35 = 29.7 ÷ 0.35 = 84.9%. You need about 85% on the final.

Example 3: Extra Credit Impact

You have a 91% in class. Your teacher offers 2% extra credit on a project worth 10% of the grade. Even though 2% sounds small, when added to your project score (say 100% + 2% = 102%), your overall grade gets a slight boost from the weighted calculation.

Frequently Asked Questions

What if my assignment weights don’t add up to 100%?

That’s perfectly fine. The calculator uses proportional weighting, meaning it divides the total weighted score by the actual sum of weights. Whether your weights total 80%, 100%, or 150%, the result will be accurate.

What’s the difference between weighted and unweighted grades?

Unweighted grades treat all assignments equally — a simple average. Weighted grades assign different importance to different assignments. Most college courses use weighted grades, where finals and exams count more than homework.

How is GPA calculated from letter grades?

GPA (Grade Point Average) assigns point values to letter grades on a 4.0 scale: A=4.0, B=3.0, C=2.0, D=1.0, F=0.0 (with +/- variations). Your GPA is the average of these points, typically weighted by credit hours.

Can I use this for multiple classes?

This calculator is designed for a single course. For calculating your overall GPA across multiple classes, use our GPA Calculator which factors in credit hours for each course.