GPA Calculator

Pick the letter grade you earned in each course, enter how many credits it carried, and the calculator returns your grade point average on the standard 4.0 scale. It weights every course by its credit load, so a 4-credit lecture pulls harder on the result than a 1-credit seminar. Leave any row set to the dash to drop it from the count, and add up to five courses at once. Read the primary figure as the average quality of your work across the term, where 4.0 is a straight-A record and anything under 2.0 usually signals academic trouble.

Where letter grades came from

Ranking students by name is old, but scoring them on a fixed scale is younger than most people assume. The American case usually cited first is Yale in 1785, where President Ezra Stiles examined 58 seniors and recorded in his diary that there were twenty Optimi, sixteen second Optimi, twelve Inferiores (Boni) and ten Pejores: best, second best, lesser and worse. Yale's own historian George Wilson Pierson presented that as tradition rather than proven priority, but the diary entry is genuine and the shape of it is a four-category scale. By 1837 Yale had converted those Latin adjectives into numbers on a four-point scale, which is one reason the four-point ceiling is sometimes traced back to New Haven. Across the Atlantic, quantitative marking is often credited to the Cambridge tutor William Farish and dated to 1792, an attribution argued by Bob Marlin and since questioned by the historian Christopher Stray, who found the evidence for Farish as the inventor of the numerical mark unpersuasive.

Letter grades are a later and more American habit. Mount Holyoke College in South Hadley, Massachusetts, is the institution usually credited with the first letter scale: by 1884 it was grading on A, B, C, D and E, with anything below 75 percent an E standing for failure, and in 1898 it added F for failing and shifted the other percentage bands. Harvard was working along the same lines, and a record from 1883 shows a student there receiving a B. The letter E then faded out over the following decades, possibly because a single letter that meant failure but read as excellent was a poor piece of design. By the 1940s the A-through-F system was dominant, though never universal: as late as 1971 only about 67 percent of American primary and secondary schools used letter grades at all. Turning each letter into a point value and averaging it by credit load sits on top of that system, and is what a 4.0 grade point average reports.

Why credits do the weighting

A GPA is not a plain average of your letters, because courses are not equal in size. The device that lets a four-credit course count more than a one-credit course is the credit hour, and it too has a datable origin. Measuring school work in contact hours was already in the air: Harvard president Charles W. Eliot pressed for it in the late nineteenth century, and the Committee of Ten he chaired reported in 1894 in support of uniform secondary instruction. What made one version stick was money. The Carnegie Foundation for the Advancement of Teaching, founded by Andrew Carnegie in 1905 and chartered by Congress in 1906, offered free retirement pensions to college professors on the condition that the institution enforce a 120-hour standard: about 120 hours of class contact with an instructor across a year for one full secondary unit. That measure became known as the Carnegie unit, it gave admissions officers a common currency for reading transcripts, and by 1910 nearly every American secondary institution was using it. College credit hours grew from the same impulse: a course meeting three hours a week for a term is worth three credits, and those credits become the weights in the GPA formula.

The calculation step by step

Each letter maps to a grade-point value, you multiply that by the course credits to get quality points, add the quality points across every course, and divide by the total credits attempted.

GPA = Σ(grade points × credits) ÷ Σcredits

The grade points below follow the US 4.0 scale used by most colleges, including the plus and minus steps many schools apply.

The formula is a weighted mean: the credits are the weights and the grade points are the values. That is why dropping a course to the dash changes both the numerator and the denominator, and why a heavy course can move your average further than a light one even when the letter is identical.

Worked example

Take the three default courses: an A− worth 3 credits, a B+ worth 3 credits, and an A worth 3 credits. Convert the letters and weight them by credits, so (3.7 × 3) + (3.3 × 3) + (4.0 × 3) = 11.1 + 9.9 + 12 = 33 quality points across 9 credits. Divide and you get 33 ÷ 9 = 3.67. Drop a 3-credit F into the same term and the denominator grows to 12 while nothing is added on top, pulling the average down to 33 ÷ 12 = 2.75.

Weighted versus unweighted

This calculator produces an unweighted GPA, which stops at 4.0 no matter how demanding the courses were. Many US high schools also publish a weighted GPA that rewards rigor: an A in an AP or honors class counts as 5.0 instead of 4.0, and IB courses are scaled the same way. That is how a transcript can show a 4.3 or 4.5 average that looks impossible on a 4.0 ceiling. Admissions offices usually strip the weighting back out and recompute an unweighted figure for fair comparison, so the number here is the one most of them start from.

How grades convert across countries

Grade points are largely a North American habit. A UK degree is classified as a first, an upper second (2:1) or a lower second (2:2) rather than averaged, and a 2:1 covers roughly 60 to 69 percent; British universities themselves put it between 3.3 and 3.5 when they have to name a number, with University College London using 3.3 as the 2:1 equivalent and the London School of Economics reading a 3.5 as good enough for one. Much of Europe grades against a numeric ceiling that does not map linearly onto 4.0: the top mark is 20 in France, 10 in the Netherlands and 6 in Switzerland, while Germany and Austria run the other way, with 1 as the best grade and 5 or 6 as a fail. Canadian schools mostly keep their own 4.0 or percentage systems, while many Australian universities, Queensland, QUT and Griffith among them, use a 7-point GPA where 7 is a high distinction. When you apply abroad, an evaluator such as World Education Services or the admissions team itself recalculates your transcript onto the local scale, so use this GPA as a personal benchmark rather than an official conversion.

Assumptions and limits

The result assumes a standard 4.0 scale with the plus-and-minus grade points shown above, and it treats every credit as an ordinary graded credit. Real transcripts carry cases this simple model leaves out. A pass/fail course usually earns credit without grade points and drops out of the GPA entirely, while an audited course normally carries neither credit nor a grade. A withdrawal often posts as a W that does not count either way. Grade-replacement and repeat policies vary widely, with some schools averaging both attempts and others letting the newer grade stand. A few institutions score an A+ at 4.0 while a handful allow 4.3, and some use no minus grades at all. If your registrar publishes its own grade-point table, enter the values it lists rather than the ones assumed here, and treat the output as an estimate of what the official cumulative GPA will show.

Frequently asked questions

What is a good GPA?

On the 4.0 scale a 3.0 is a solid B average and 3.5 or higher is generally read as strong. Competitive graduate programs and selective employers often look for 3.5 to 3.7, and a 3.7-plus is typically what lands a student on the dean's list. Anything under 2.0 usually triggers academic probation.

How do I calculate GPA with credit hours?

Multiply each course's grade points by its credit hours, add the products, then divide by the total credit hours. Three 3-credit courses graded A− (3.7), B+ (3.3) and A (4.0) work out to (11.1 + 9.9 + 12) ÷ 9 = 3.67. Credits act as weights, so a 4-credit course shifts your average more than a 1-credit one.

What is the difference between weighted and unweighted GPA?

An unweighted GPA caps at 4.0 and treats every course equally, which is what this tool produces. A weighted GPA adds up to a full extra point for harder classes, so an A in an AP or IB course counts as 5.0 rather than 4.0 and the total can pass 4.0. High schools often report the weighted figure, but most colleges recalculate an unweighted 4.0 number for comparison.

Does an F affect my GPA a lot?

Yes, because an F is worth 0 grade points while the course's credits still sit in the denominator. Adding a 3-credit F to three A-range courses drops a 3.67 average to 2.75. Retaking the course under a grade-replacement policy is often the only way to fully undo the hit.

How do universities convert international grades to a GPA?

They rarely accept a self-reported number and instead recalculate the transcript onto the local scale. A UK upper-second (2:1) is commonly read as roughly a 3.3 to 3.7, and services such as WES issue an official equivalency. Because systems in France (out of 20), the Netherlands (out of 10) and Australia (out of 7) do not map linearly onto 4.0, treat any single conversion as an estimate.