What If I Get a Zero on a Test?
A zero on a test worth 20% of your course grade will cause an immediate 17-point drop (from 85% down to 68%), turning a B into a D+.
Because a zero contributes 0 points toward that entire weighted category, the mathematical drop equals exactly your current grade multiplied by the test weight.
How This Is Calculated
If your running grade is 85% (0.85) and you receive 0% on an exam worth 20% (0.20): New Grade = (85 × 0.80) + (0 × 0.20) = 68.0 + 0 = 68.0% (D+).
A zero is the single most damaging event in academic grading because it provides zero numerator points while consuming the full denominator weight.
Check whether your syllabus includes a "drop lowest score" policy, makeup exam windows, or replacement of your lowest test score with your final exam score.
Interactive Grade Calculator
Adjust the points or percentage below to calculate custom test and assignment grades in real time.
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Convert raw percentage score into letter grade, 4.0 GPA point, and band.
Enter any percentage score (e.g. 89.5, 92, 78.4, 105 for extra credit)
Teacher Policy Note: Scores like 89.5% round up to 90% (A-) under 0-decimal standard rounding, but remain in the B+ band under unrounded truncation. Always check your syllabus policy.
Grade Comparison & Reference Table
| Current Grade | Test Weight | Grade After Zero (0%) | Total Point Loss |
|---|---|---|---|
| 95% (A) | 10% | 85.5% (B) | -9.5% |
| 90% (A-) | 15% | 76.5% (C) | -13.5% |
| 85% (B) | 20% | 68.0% (D+) | -17.0% |
| 80% (B-) | 25% | 60.0% (D-) | -20.0% |
| 75% (C) | 30% | 52.5% (F) | -22.5% |
Weighted Grade Calculator
Model different test scores and see the exact impact on your cumulative course average.
Related Grade Questions
Frequently Asked Questions
Can you recover from a 0 on a test?
Yes. If the test was worth 10-15%, earning high scores on remaining coursework or taking advantage of dropped-score policies can restore your grade to a B or A.
Why does a zero hurt your grade so much more than a 50%?
A 50% on a 20% test preserves 10 percentage points (yielding 78%), whereas a 0% contributes 0 points (yielding 68%)—a massive 10% difference.