US School Grade Calculator

Most US schools use letter grades from percentages: A = 90-100%, B = 80-89%, C = 70-79%, D = 60-69%, F = below 60%. Some schools use stricter scales (A = 93+, B = 85-92, etc.) or include pluses and minuses (A- = 90-92, A = 93-96, A+ = 97-100). Always check your specific school's grading scale - the boundaries vary.

When calculating final semester grades, weight by category: tests 40%, homework 25%, projects 20%, participation 15% (typical example - varies by class). Each student's overall grade is the weighted average. Final exam often counts 15-25% of semester grade in many high schools and colleges.

Weighted average = (Test avg × test weight) + (Homework avg × homework weight) + (Project avg × project weight) + (Participation avg × participation weight). A student with 88% test average, 95% homework, 82% projects, 100% participation in 40/25/20/15 split: (88×0.4) + (95×0.25) + (82×0.2) + (100×0.15) = 35.2 + 23.75 + 16.4 + 15 = 90.35% = A.

The weighting matters enormously. The same scores under different weighting can produce different final grades. Some students struggling on tests can compensate with high homework grades only if homework is heavily weighted; if tests dominate (60-70% weight), they cannot.

If you have 75% going into the final and the final is worth 25%, what do you need? Required final = (Target - (current × (1-weight))) / weight = (70 - 75×0.75) / 0.25 = (70 - 56.25)/0.25 = 55%. So scoring 55% on the final keeps you at 70% (a C) overall.

Many students don't realise how much (or little) the final affects them. With 90% going in and a 20% final, you need only 50% to keep an A. With 80% going in and a 30% final, you need 73% to keep a B. The specific math sometimes makes test stress unnecessary.

Plus/minus grading: A+ and A both 4.0, A- = 3.7, B+ = 3.3, B = 3.0, B- = 2.7, etc. Some colleges and grad schools include the +/- in GPA calculation; high schools usually do for unweighted. Weighted GPAs add 0.5 for honors classes and 1.0 for AP/IB classes - so a B (3.0) in AP becomes 4.0, an A (4.0) becomes 5.0.

Final letter grade vs GPA point value: an 89.4% might be a B+ at one school, B at another. Round-up policies vary. Some teachers manually adjust borderline grades - a 89.6% might become an A- with strong participation, a 89.4% might stay a B+. The [US GPA Calculator](/us-gpa-calculator) handles cumulative GPA calculation.