Weighted Grade Calculator
The weighted grade calculator turns a list of assessments — each with a score and a weight — into your overall percentage and a letter grade. Enter each assessment's mark (0–100) and how much it counts toward the final grade (the weight can be a percentage like 40, or any number such as points or credits). The overall grade updates instantly as you type, entirely in your browser.
Calculator
The formula
Overall = Σ(score × weight) ÷ Σ(weight)
Multiply each score by its weight, add those products together, then divide by the total of all the weights. The weights do not need to add up to 100 — the division normalises them. The letter grade uses the standard US scale: A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F.
Worked example
Say you have Homework 88% (weight 10), Midterm 76% (30), Project 92% (20) and Final 81% (40).
- Weighted total = 88×10 + 76×30 + 92×20 + 81×40 = 880 + 2280 + 1840 + 3240 = 8240
- Total weight = 10 + 30 + 20 + 40 = 100
- Overall = 8240 ÷ 100 = 82.4%, which is a B.
Frequently asked questions
- Do my weights have to add up to 100?
- No. The calculator divides by the total of your weights, so any consistent unit works — percentages, points or credit hours all give the correct weighted average.
- What happens if I leave a row blank?
- Rows missing a score or a weight are ignored, so you can add categories as the term goes on. If every weight is zero the calculator shows a hint instead of a result.
- Which letter-grade scale is used?
- The standard US scale (A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, else F). Your institution may set different boundaries — always confirm with your syllabus.