Preliminary Microbiology Grade Calculator

Website: https://calebhendren.github.io/micrograde/

Disclaimer: This tool is informational. The official final letter grade is calculated by the instructor of record.

Privacy and data

• All calculations run client-side in your browser.
• No grades are uploaded or sent to any server.

Purpose

• Enter scores for lecture and lab components.
• View running totals, current letter grade, and points needed to reach higher thresholds.
• See which lecture exam is replaced by the final and which lab quiz is dropped.

Grading logic

Lecture

• Components: Exam 1 (100), Exam 2 (100), Exam 3 (100), Final (100), Extra Credit (cap +10).
• Replacement rule: If the final exam score is greater than the lowest of Exam 1–3, that lowest exam is dropped and the final counts twice.
  Example: 78, 92, 83, Final 99 → becomes 99, 92, 83, 99.
• Lecture base maximum without extra credit: 400. With extra credit, lecture can exceed base by up to 10.

Lab

• 10 lab quizzes across Labs 2–6 and 8–12, 5 points each. The lowest single quiz is dropped → best 9 count (max 45).
• Task points: 5.
• Midterm: 50.
• Final: 50.
• Extra Credit (if provided): cap +5.
• Lab base maximum without extra credit: 150. With extra credit, lab can exceed base by up to 5.

Course totals and thresholds

• Course base total (without extra credit): 400 (lecture) + 150 (lab) = 550.
• Extra credit can raise the numeric total above 550. Thresholds do not change.

Letter-grade thresholds

• A: 493+
• B: 438–492
• C: 383–437
• D: 355–382
• F: 0–354

What the app displays

• Which lecture exam was replaced by the final.
• Which lab quiz was dropped.
• Subtotals for lecture and lab, course total, current letter grade.
• Points needed to reach A/B/C/D, shown to two decimals and never negative.

Use

1. Visit https://calebhendren.github.io/micrograde/
2. Enter your scores.

For instructors

Fork and adapt

• You may fork this repository and adapt point values, extra-credit caps, thresholds, or replacement/drop rules to fit your syllabus.
• Update labels and help text to match your course policy.

Publish as a GitHub Pages site

• Repository → Settings → Pages.
• Build and deployment → Source: Deploy from a branch.
• Branch: main. Folder: / (root). Save.
• Access at https://<your-username>.github.io/<repo-name>/.