GPA Calculator 2026: How to Compute Your Grade Point Average Accurately

Your GPA is the single number that follows you from your first semester of high school through the day you apply to graduate school. Yet most students compute it wrong — either by averaging letter grades instead of grade points, by ignoring credit hours, or by mixing weighted and unweighted scales. Get any of those three things wrong and the number you put on a college application can be off by a quarter point or more, which is the difference between getting an interview and an automatic decline at competitive programs.

This 2026 guide walks through the exact math used by U.S. high schools, four-year universities, and graduate admissions offices. Everything here applies to the standard unweighted 4.0 scale. If you take honors, AP, IB, or dual-enrollment courses, read our companion piece on the weighted GPA scale — but understand that almost every college will recompute your unweighted GPA from your transcript before deciding.

The GPA formula in one line

GPA = (sum of grade points × credit hours) ÷ (sum of credit hours). The numerator is the total quality points you earned. The denominator is how many credit hours those grades represent. This is a weighted average — a 3-credit A is worth three times as much to your GPA as a 1-credit A.

The standard 4.0 grade-point conversion

• A or A+ = 4.0 (some schools cap A+ at 4.0; others use 4.33)
• A− = 3.7
• B+ = 3.3, B = 3.0, B− = 2.7
• C+ = 2.3, C = 2.0, C− = 1.7
• D+ = 1.3, D = 1.0, D− = 0.7
• F = 0.0

Schools differ on whether they award the plus/minus 0.3 modifier. Your registrar's grading policy is authoritative; if you don't know, look up your school's academic catalog or just ask. Our calculator supports both the strict integer scale (A=4, B=3, C=2, D=1, F=0) and the standard plus/minus scale shown above.

A worked example: one full semester

Say you took five courses this semester: English (3 credits, A−), Calculus (4 credits, B+), Chemistry with lab (4 credits, B), Spanish (3 credits, A), and a 1-credit physical education class (A). Multiply each grade point by the credits — 3.7×3 = 11.1, 3.3×4 = 13.2, 3.0×4 = 12.0, 4.0×3 = 12.0, 4.0×1 = 4.0. Sum: 52.3 quality points across 15 credit hours. Semester GPA: 52.3 ÷ 15 = 3.487, which rounds to 3.49.

Cumulative GPA across multiple semesters

Cumulative GPA is not the average of your semester GPAs — it's the weighted average of every graded course you've ever completed. To compute it, sum the quality points from every semester and divide by your total cumulative credit hours. A heavy 18-credit semester moves your cumulative GPA more than a light 12-credit semester at the same grade level.

What the calculator handles automatically

• Variable credit hours per course (1, 2, 3, 4, 5+).
• Plus/minus letter grades (A− through D−) with the correct 0.3 modifier.
• Multiple semesters with running cumulative GPA.
• A 'what you need next term' projection — given a target GPA, it tells you the exact grades you'd need next semester to hit it.

Common mistakes to avoid

Three errors come up over and over. First: averaging letter grades. Two A's and a B is not a 'B+ average' — it's a 3.67, which is much closer to A− territory. Second: ignoring credit hours. A 1-credit gym A and a 4-credit organic chemistry C do not cancel out — the C drags your GPA roughly four times as much as the A pulls it up. Third: mixing pass/fail credits into the math. Pass/fail courses contribute to your transcript but do not affect GPA unless the policy says otherwise.

When to recompute

Run your numbers at the end of every grading period. If your cumulative GPA is moving more than ±0.1 in a single semester, you've either had a breakthrough term worth understanding or a bad term worth diagnosing. Either way, the action you should take is informed by which courses moved the number — that's exactly what the per-course breakdown in our calculator shows you.

What's next

Calculating GPA is the easy part. Improving it requires a plan. Once you have your number, look at the per-semester trend: is it climbing, flat, or falling? A falling trend across two consecutive semesters is the single biggest red flag admissions readers watch for. The fix is rarely 'work harder' — it's almost always 'change one specific habit per course' (sleep, office hours, problem-set frequency, or course load).