On the standard US 4.0 scale, a GPA is the credit-weighted average of your course grade points: multiply each course's grade point by its credit hours, add those products together, and divide the sum by your total credit hours. The grade point for an A is 4.0, for a B is 3.0, for a C is 2.0, for a D is 1.0, and for an F is 0.0, with plus and minus steps filling in between. Because each grade is weighted by the credits it is worth, a 4-credit class pulls your GPA four times as hard as a 1-credit class, which is why two students with the same letter grades can end up with different numbers on their transcript. The fastest way to get your own weighted GPA on the 4.0 scale is to enter your letter grades and credit hours into a calculator — the result updates as you type and shows your GPA to two decimals, your total credits, and the grade points you earned. This article walks through the formula, the full letter-grade chart, worked examples, and the edge cases (A+, AP, and honors) that change the result.
The 4.0 GPA Formula, Written Out
Your grade point average on the 4.0 scale is computed with one formula, and every registrar uses the same one:
GPA = Σ (grade point × credit hours) ÷ Σ (credit hours)
Read it as: for every course, multiply the grade point (4.0 for an A, 3.0 for a B, and so on) by the number of credit hours that course is worth. Add all those products together, then divide by the total number of credit hours across those courses. The Greek letter sigma (Σ) is shorthand for "sum them all up."
Two consequences follow directly from that formula:
- Credit weighting. A 4-credit course contributes four times as much to the numerator as a 1-credit course, so an A in a heavy class lifts your GPA more than an A in a light one.
- Same letter, different GPA. Two students can post identical letter grades and still finish the term with different GPAs if their course loads carry different credit hours.
Notice what the formula does not include: the difficulty of a class, the number of hours you studied, or whether the course was Pass/Fail. On the plain 4.0 scale, difficulty does not enter the math. That detail matters when you get to weighted versus unweighted GPAs later in this article.
Letter Grade to Grade Point on the 4.0 Scale
| Letter Grade | Grade Points |
|---|---|
| A+ | 4.0 |
| A | 4.0 |
| 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 |
These are the grade points that go into the formula above. The A+ sits at 4.0 because the standard US 4.0 scale caps the top grade at 4.0; a small minority of schools use 4.3 for an A+, and if yours does, substitute 4.3 when you enter an A+ into the calculator so the result matches your transcript.
Plug Your Courses Into the GPA Calculator
The GPA Calculator applies that formula to every row you fill in. To use it:
- For each course, choose its letter grade (A, A−, B+, and so on) from the dropdown.
- Enter the credit hours that course is worth. If you have more courses than the default rows show, click Add course to insert another row.
- Read your weighted GPA on the 4.0 scale below — it updates the moment you type, along with your total credit hours and the grade points you earned.
- Use the row's remove control to delete any course you entered by mistake.
Empty rows are ignored, so you can leave extra rows blank while you work. Any row missing a letter grade, or with zero or negative credit hours, is skipped with a small note so a typo cannot silently distort the result.
The calculator does not upload anything, so the grades and credit hours you type never leave the browser tab you are working in.
Worked Example: A 3-Credit A and a 4-Credit B
Here is one complete calculation, step by step, so you can see how the formula lands on a number.
Suppose you took two courses this semester:
- Course 1: A (4.0 grade points), 3 credit hours
- Course 2: B (3.0 grade points), 4 credit hours
Step 1 — multiply each grade point by its credits:
- Course 1: 4.0 × 3 = 12.0
- Course 2: 3.0 × 4 = 12.0
Step 2 — add the products:
12.0 + 12.0 = 24.0
Step 3 — divide by total credit hours (3 + 4 = 7):
24.0 ÷ 7 = 3.4286…
Rounded to two decimals, the semester GPA is 3.43 on the 4.0 scale.
That 3.43 is what the tool will show once you enter those two rows. If you want to try a longer transcript, add the rest of your courses the same way; the GPA and total credits below the table update with every keystroke. Once you have your number, the next step is usually comparison: against your degree program's minimum, against a scholarship cutoff, or against the median GPA of students admitted to a program you are targeting. The same approach works for a single semester, a full year, or a cumulative run across every course on your transcript.
How the Same Letter Grades Land on Different GPAs
To see why credit weighting dominates, compare three short transcripts with the same letter grades but different course loads.
Transcript A (proportional):
- Course 1: A (4.0), 4 credits
- Course 2: B (3.0), 4 credits
Calculation: (4.0×4 + 3.0×4) ÷ 8 = (16.0 + 12.0) ÷ 8 = 28.0 ÷ 8 = 3.50.
Transcript B (heavier A):
- Course 1: A (4.0), 4 credits
- Course 2: B (3.0), 1 credit
Calculation: (4.0×4 + 3.0×1) ÷ 5 = (16.0 + 3.0) ÷ 5 = 19.0 ÷ 5 = 3.80.
Transcript C (heavier B):
- Course 1: A (4.0), 1 credit
- Course 2: B (3.0), 4 credits
Calculation: (4.0×1 + 3.0×4) ÷ 5 = (4.0 + 12.0) ÷ 5 = 16.0 ÷ 5 = 3.20.
The same two letter grades produced three different GPAs purely because the credit mix shifted. Nothing about the student's effort changed — only where the credits sat. This is exactly the move you can rehearse on the GPA Calculator: stack your better grades into heavier-credit courses and your number rises; stack your weaker grades into heavier-credit courses and your number falls.
For readers who start from a percentage rather than a letter grade, the companion guide how to calculate GPA from a percentage score walks through converting a percentage into the right letter and credits first.
Weighted vs Unweighted: Two Meanings People Confuse
The word weighted shows up in two different ways around GPAs, and conflating them is the most common source of confusion.
Credit weighting (always on). Every GPA on this page, and every GPA on a US college transcript, is "weighted" in the sense that heavier credit-hour courses pull the average harder than lighter ones. The formula in the first section already does this. There is no unweighted version that ignores credit hours — a plain average of letter grades is not a GPA at all.
Honors or AP weighting (sometimes on). Some high schools add bonus points to reward harder classes: an A in an AP or honors course might count as 5.0 instead of 4.0, and a B in the same class might count as 4.0 instead of 3.0. The result is a GPA that can climb above 4.0 — a 4.3, 4.5, or even 5.0 scale. This is the sense in which the school-reported GPA is sometimes called a "weighted GPA."
| Aspect | Unweighted, Credit-Weighted 4.0 | Honors / AP-Weighted (High School) |
|---|---|---|
| Credit weighting applied | Yes — every grade is multiplied by its credit hours | Yes — same credit weighting still runs underneath |
| Bonus for harder classes | No extra points for AP, honors, IB, or dual enrollment | Yes — an A in AP can count as 5.0 instead of 4.0 |
| Maximum value | Caps at 4.0 (or 4.3 at a few schools for A+) | Can exceed 4.0, sometimes up to 5.0 or higher |
| Typical user | US colleges, transfer applications, academic standing | Some US high schools for class rank or honors weighting |
| What this tool reports | Yes — this is exactly the number shown below the rows | No — use the school's own calculator or enter the boosted point values yourself |
The tool on this page uses the unweighted, credit-weighted 4.0 scale that US colleges use for admissions, transfer credit, and academic standing. It does not add any AP or honors bonus. If your school awards bonus points, you have two choices: enter the boosted point value your school assigns (for example, type 5.0 in place of an A in an AP class), or use the school's own GPA calculator for the transcript number and use this one to sanity-check the unweighted version.
A+, AP, and Honors: Edge Cases That Move the Number
A handful of situations can move your GPA in ways the standard formula does not predict.
A+ on a strict 4.0 school. On the most common US scale, A+ is the same as A — both 4.0. An A+ in a 3-credit course therefore adds 12.0 to your numerator, exactly like an A would. If your registrar lists an A+ separately and your school uses the rarer 4.3 cap, replace the 4.0 value with 4.3 in your row before reading the result; the rest of the calculation proceeds normally.
AP, IB, honors, or dual-enrollment classes. On a 4.0 college transcript, those classes do not earn bonus points — an A in AP Calculus is 4.0, the same as an A in intro art. If your high school transcript shows a GPA above 4.0, that is the school adding a difficulty bonus. When you want the unweighted college-style number, use the regular letter-grade values from the chart above.
Pass/Fail or audit credits. Generally, Pass/Fail courses are excluded from the GPA calculation; do not include them in the calculator unless your school explicitly counts a Pass as a C (2.0) or higher. Audited courses should be omitted entirely.
Withdrawal and incomplete grades. A W usually does not enter the GPA at all. An I (incomplete) generally does not post a grade point until it is resolved, so leave that row blank until the final grade is in.
Repeated courses. Many schools replace the original grade with the new one in the GPA calculation; others average them. Check your registrar's repeat policy before you decide which version to enter. The calculator simply adds every row you fill in, so the right approach is to enter only the grades your school counts — either the replacement or both, depending on the rule.
Common GPA Scenarios Worth Checking
Once the formula clicks, a few everyday situations become easy to reason about.
One bad grade in a heavy class. Drop one C (2.0) into a transcript of four 3-credit A's (4.0 each) plus one 3-credit C. The math is (2.0×3 + 4.0×3 + 4.0×3 + 4.0×3 + 4.0×3) ÷ 15 = (6 + 48) ÷ 15 = 54 ÷ 15 = 3.60. A perfect transcript of five 3-credit A's would have produced a 4.00, so that single C knocked 0.40 points off the term.
One strong grade rescuing a weak semester. Add a 4-credit A (4.0) to a transcript made up of three 3-credit B's (3.0 each). With the A: (4.0×4 + 3.0×3 + 3.0×3 + 3.0×3) ÷ 13 = (16 + 27) ÷ 13 = 43 ÷ 13 = 3.31. Without the A, the GPA on the three B's alone is 3.00. The heavier A pulled the term up by 0.31.
What a planned withdrawal avoids. A 4-credit F (0.0) in an otherwise solid term does serious damage: (0.0×4 + 3.0×3 + 3.0×3 + 3.0×3) ÷ 13 = (0 + 27) ÷ 13 = 2.08. A withdrawal would have left that row out of the math entirely, keeping the term at a 3.00.
Each of these snapshots is just the same formula with different inputs. Plug your own courses into the GPA Calculator and the same arithmetic runs in real time below the rows.
Reading Your Number in Context
A GPA on its own is just a number; context is what makes it useful. A 3.0 in a tough engineering program is not the same achievement as a 3.0 in a less demanding major, even though the digits match. Most US colleges publish a median admitted GPA per program, and your registrar can tell you the threshold for honors, dean's list, or academic probation at your school.
Two practical uses for the tool:
- Before grades post. Run your in-progress grades through the calculator to see what your semester or cumulative number will land on. Use that forecast to plan which finals to prioritize, or to decide whether a withdrawal makes more sense than riding out a failing course.
- After grades post. Plug the posted numbers in and compare the result to what your registrar reports. If the two disagree, the most common culprits are grade replacements from a retaken course, dropped courses under a forgiveness policy, or bonus-point weighting your school applies — all things the calculator cannot detect on its own.
Pair the GPA Calculator with a grade calculator to work out a single class grade from its assignments, an average calculator for a quick unweighted mean, or a basic calculator for one-off sums.