Test Score Calculator — Weighted Averages & Next-Exam Goals
When exams carry different weights, a simple mean of scores misleads you. This calculator uses each test's weight so your "current test average" matches the syllabus. From there you can set a target and see what average you need on remaining assessments.
Use it after each unit test, before finals season, or when negotiating retake policies. If your teacher drops the lowest quiz, model that by excluding that row once the policy is firm.
Pair with our grade converter if you need to align percentages with letter cutoffs.
Quick Answer:
Test average = sum of (each score × its weight) ÷ total weight. To see what you need on future tests, enter your current scores and how many tests are left; the calculator shows the average you need to hit your goal.
Test Scores
Results & Predictions
Current Test Average
0.0%
Based on 1 test
What score do you need?
Required Score on Future Tests
170.0%
Average needed on next 1 test
How it works:
The calculator uses weighted averages based on test weights. Higher weight = more impact on final average.
How to use this calculator
- List completed tests. Add score and weight for each graded exam or quiz.
- Normalize weights. Ensure weights match the test category total from the syllabus.
- Set a target average. Choose the overall test-category goal you want.
- Enter remaining assessments. The tool solves for required averages on what's left.
- Update after each score. Refresh the plan whenever new grades post.
How it works
Weighted averages multiply each score by its relative weight, sum, and divide by total weight—identical math to a weighted grade category inside a larger class grade.
Understanding weighted test averages
A weighted average differs from a simple average because each test score counts proportionally to its assigned weight. If your midterm is worth 40% of your grade and a quiz is worth 10%, a perfect score on the quiz has far less impact than a perfect score on the midterm. The formula is straightforward: multiply each score by its weight (as a decimal), add those products together, then divide by the sum of all weights.
For example, suppose you scored 88 on a midterm (weight 0.40), 95 on homework (weight 0.20), and 72 on a quiz (weight 0.10). The weighted sum is (88 × 0.40) + (95 × 0.20) + (72 × 0.10) = 35.2 + 19.0 + 7.2 = 61.4. The total weight used so far is 0.70, so your current weighted average is 61.4 ÷ 0.70 = 87.7. You can then estimate what final exam score you need to reach your target.
Common mistakes include forgetting to normalize weights when some assignments are not yet graded and treating letter grades as numbers without converting them to percentages first. Always double-check that your weights add up to 1.0 (or 100%) for the full course — if they do not, the calculator adjusts to use only the weights you have entered so far.