AP Biology score calculator
On the AP Biology exam, the 60 multiple-choice questions are 50% of your score and the free response, two long questions worth 9 points each and four short ones worth 4, the other 50%, so one free-response point counts as much as about 1.8 multiple-choice answers. Enter your practice marks for your score out of 100 on those weights. The College Board publishes no chart that turns it into a 1 to 5, so this page does not guess one.
Example: weighted AP Bio score
35 from multiple choice (42 of 60) + 32.4 from free response (22 of 34), by the College Board’s weights: 50% and 50%.
One more multiple-choice answer adds 0.83 and one more free-response point 1.47: a free-response point is worth as much as 1.8 multiple-choice answers.
To reach 70 of 100: 24 of the 34 free-response points with your 42 multiple-choice answers (2 more than now), or 46 of the 60 multiple-choice answers with your free response as it is (4 more).
- Multiple choice, 42 right35 of 50
- Question 1, 6 of 98.8 of 13.2
- Question 2, 5 of 97.4 of 13.2
- Question 3, 3 of 44.4 of 5.9
- Question 4, 3 of 44.4 of 5.9
- Question 5, 2 of 42.9 of 5.9
- Question 6, 3 of 44.4 of 5.9
The College Board publishes no chart that turns this into a 1 to 5 for today’s exam, so this is not your AP score.
The exam format and the 2026 scoring guidelines checked on AP Central . AP and Advanced Placement are trademarks of the College Board, which does not make or endorse this calculator.
How the weighted score is worked out
- The exam: 60 multiple-choice questions (single questions and sets of usually 4 or 5 on a shared stimulus, in 1 hour 30 minutes), then 6 free-response questions in 1 hour 30 minutes.
- Multiple choice: your answers right ÷ 60 × 50. Each answer is worth 0.83.
- Free response: add your question scores (out of 34), then ÷ 34 × 50. Each point is worth 1.47.
- Add the two: a score out of 100 with the sections in the College Board’s proportions, 50% and 50%.
The College Board does not say how it combines the sections into the composite behind your AP score, only what share each section has, so this is the plainest reading of those shares.
A worked example
42 of 60 multiple-choice answers right: 42 ÷ 60 × 50 = 35. Free-response scores of 6, 5, 3, 3, 2 and 3 make 22 of 34: 22 ÷ 34 × 50 = 32.4. Together 67.4 of 100.
Where the next points are: a multiple-choice answer adds 0.83 and a free-response point 1.47, so one free-response point counts as much as about 1.8 multiple-choice answers.
What each free-response question is worth
Each question’s points are from the College Board’s 2026 scoring guidelines; its share of your 100 follows from the 50% the free response carries.
| Question | What it asks | Points | Of your 100 | As many multiple-choice answers as |
|---|---|---|---|---|
| Question 1 | Interpreting and evaluating experimental results | 9 | 13.2 | 15.9 |
| Question 2 | Interpreting and evaluating experimental results, with graphing | 9 | 13.2 | 15.9 |
| Question 3 | Scientific investigation | 4 | 5.9 | 7.1 |
| Question 4 | Conceptual analysis | 4 | 5.9 | 7.1 |
| Question 5 | Analyzing a model or visual representation | 4 | 5.9 | 7.1 |
| Question 6 | Analyzing data | 4 | 5.9 | 7.1 |
To practice, AP Central posts the last three years’ AP Bio free-response questions with their scoring guidelines and sample answers from students who sat the exam: past AP Bio exam questions.
Why there is no 1 to 5 here
The College Board sets the composite each AP score needs after every exam and publishes no chart for today’s AP Bio exam. A 1 to 5 from any calculator is someone’s guess at those cut points.
What it does publish is how students scored. In 2026: 15% a 5, 25% a 4, 31% a 3, 21% a 2 and 8% a 1; 71% scored a 3 or higher. Those are shares of students, not the marks each score needed.
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Sources: College Board, AP Central, AP Biology Exam; College Board, AP Biology 2026 Scoring Guidelines; College Board, AP Students, AP Biology Exam Score Distributions.