GPACalcZone is an independent site. It isn't affiliated with any school, college, the College Board, the IB or the Common App. Every calculator is built so you can check the answer yourself: the result shows the sum it came from, and the conventions behind it are written down below. Your school's registrar has the final word on your official GPA — if your handbook does something differently, most settings here can be changed to match it.
Methodology
The grade scale
Grades use the standard 4.0 scale: A 4.0, B 3.0, C 2.0, D 1.0, F 0.0. Plus and minus move a grade by about a third of a point, so an A− is 3.7 and a B+ is 3.3. By default an A+ counts the same as an A (4.0); you can switch it to 4.33, or turn plus/minus off so every A counts as 4.0. The full chart, including percentages, is on the GPA scale page.
When you enter percentages instead of letters, the default cutoffs are 90 / 80 / 70 / 60 for A / B / C / D, split into plus/minus bands — for example an A starts at 93% and an A− at 90%. Schools differ here more than anywhere else, so the cutoffs are editable.
Credits and what counts
A GPA is a credit-weighted average: each class's grade points times its credits, added up, divided by the total credits. A 12-credit term with 40.3 grade points is 40.3 ÷ 12 = 3.36. Pass (P), no pass (NP) and withdrawn (W) marks are left out of both sums, as they are on most transcripts. A cumulative GPA is the same average across terms: your GPA so far times its credits, plus the new term's grade points, over all the credits — a 3.20 over 60 credits plus that term makes 3.23.
Weighted high school GPA
The high school calculator shows weighted and unweighted GPAs side by side. Unweighted uses the plain 4.0 scale with A+ capped at 4.0. Weighted adds a boost for the class level — by default +0.5 for honors and +1.0 for AP, IB and dual credit, all editable because schools set their own. A failed class earns no boost: an F in an AP class is still 0.0. In the worked example on that page the same classes come to 3.44 weighted and 2.89 unweighted.
Course grades and finals
The weighted grade calculator averages each category's score by its weight, over the weight graded so far — so the weights don't have to add up to 100% until the course is finished. Extra credit is added as percentage points on the course grade. The final grade calculator works out the score needed on the final from your current grade and the final's weight; the "just pass" mark defaults to 60% and can be changed.
Targets you can't reach
When a target GPA or grade isn't reachable, the calculators say so and show the best result still possible, rather than an impossible number like "you need 170% on the final". When any result will do, they show the lowest you can finish with.
Rounding
Calculations keep full precision and round once, at the end, to two decimal places, rounding halves up. The term above is 3.358333… before rounding, shown as 3.36. A result of exactly 3.175 shows as 3.18, not 3.17 — a common error when computers round binary fractions. Rounding a GPA at each step instead can change the last digit, which is why two calculators sometimes disagree by 0.01.
How the numbers are checked
The maths lives in one small library that every calculator shares, with automated tests for each formula. Every worked example on this site — in the page text and the FAQs — is computed from that library and checked by those tests, so the examples can't drift from what the calculators actually do.
Privacy in one line
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Corrections and suggestions
If a result looks wrong, or your school uses a rule the calculators can't handle, email contact@gpacalczone.com. See the contact page for what helps us reproduce a problem.