Grade Calculator
Most courses do not grade every assignment equally — a final exam might be worth 60% while weekly quizzes share the rest. This grade calculator combines up to five weighted components into one overall percentage and a letter band, so you can see where you stand or work out the score you still need. Enter each piece of work with its weight; the weights need not add to 100, because the calculator normalises them, so raw points or percentages both work.
Calculate
Default result: 84.00
Grade Calculator · Result
calculators.dev
Overall grade (%)
90 × 40 × 80 × 60
- Letter grade (A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, else F)
- B
Reviewed by the calculators.dev team · Last updated 2026-06-23
How to calculate
For each component, enter the percentage you scored and how much it is worth. The calculator multiplies each score by its weight, adds those products, and divides by the total of the weights — so a 90% on a 40-weight assignment and an 80% on a 60-weight exam give (90 × 40 + 80 × 60) ÷ 100 = 84%. Because the weights are normalised, you can enter them as 40 and 60, as 0.4 and 0.6, or as raw point totals. The overall grade and its letter update as you type.
overall = Σ(score × weight) ÷ Σ(weight). Each component's score is weighted by its share of the total, and the divisor is the sum of the weights, which is why the weights do not have to total 100. The letter grade shown uses a simple scale (A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F); your school's exact cut-offs may differ.
Example calculation
Say an exam worth 60% of the grade scores 80%, and coursework worth 40% scores 90%. Each score is multiplied by its weight: 90 × 40 = 3600 and 80 × 60 = 4800, totalling 8400. Dividing by the total weight of 100 gives an overall grade of 84% — a B on a standard scale. The heavier exam pulls the overall result toward its 80%.
- percentage
- 84%
- letter
- B
Assumptions
- Weights are normalised by their own total, so 40 and 60 give the same result as 0.4 and 0.6 or as raw point values.
- Scores are entered as percentages; convert a raw mark to a percentage (points earned ÷ points possible × 100) first if needed.
- The letter band uses common ten-point cut-offs as a light guide — your institution's grading scale is authoritative.
Common mistakes
- Entering raw points for some components and percentages for others, which mixes scales and distorts the weighted result.
- Forgetting a component's weight, so it silently drops out of the overall grade.
- Reading the letter band as official when a course uses different cut-offs or plus-minus grading.
Frequently asked questions
How do I calculate a weighted grade?
Multiply each score by its weight, add the results, and divide by the total of the weights. A 90 at weight 40 and an 80 at weight 60 give 84%.
Do the weights have to add up to 100?
No. The calculator divides by the sum of the weights, so 40 and 60, or 0.4 and 0.6, or even raw point totals all give the same overall grade.
What score do I need on the final to reach a target?
Enter your known components with their weights and the final with its weight, then adjust the final's score until the overall reaches your target.
Is the letter grade official?
No — it uses common ten-point cut-offs as a guide. Your school's grading scale and any plus-minus rules determine the real letter.