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GPA Calculator

Credit-weighted GPA on any scale, plus the Indian CGPA ↔ percentage conversion, with the weighting mistake most students make.

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Quick answer

GPA = Σ(grade points × credits) ÷ Σ(credits), an A in a 1-credit lab moves your GPA far less than a B in a 4-credit core. India's CBSE convention: percentage ≈ CGPA × 9.5.

4 for US, 10 for India.

GPA
3.63
Out of
4
Total credits
10

CGPA ↔ percentage (CBSE 9.5 convention)

= 77.9% · back-converts to 8.20 CGPA

Formulas last verified 2026-10-10. Results are estimates, not financial advice. How we calculate.

The formula registrars actually use

GPA = Σ(grade points × credits) / Σ(credits)

Every course contributes its grade points multiplied by its credit hours; the sum is divided by total credits. Nothing else, no rounding per course, no dropping the lab. The formula is a weighted average, and the weights are the credits.

Why the naive average is wrong

Take an A in a 3-credit course and a B in a 1-credit lab:

CourseGradePointsCreditsPoints × credits
Core courseA4.0312.0
LabB3.013.0
Total415.0

15.0 ÷ 4 = 3.75. Averaging the grades directly gives 3.5, off by a quarter point, because it treats a 1-credit lab as equal to a 3-credit core. The direction of the error flips with the situation, which is exactly why it goes unnoticed: sometimes it flatters, sometimes it wounds.

Weighted GPA: two meanings, one word

Credit-weighting, above, applies everywhere and always. US high schools add a second sense: weighted GPA grants harder courses a higher ceiling, an A in an AP or IB course counts 5.0 instead of 4.0, so a transcript full of AP classes can carry a GPA above 4. Unweighted GPA caps everything at 4.0 regardless of difficulty. Colleges know both games and usually recompute applicants under a common system, so the honest move is to report whichever number is asked for and let the transcript speak.

The Indian conversions

The calculator includes the CBSE convention: percentage ≈ CGPA × 9.5. A CGPA of 8.2 maps to about 77.9%. The factor 9.5 is empirical, CBSE derived it from the average marks of students in each grade band, so treat it as the accepted estimate it is. Two cautions:

  • Individual universities sometimes publish their own conversion formula (× 10, or piecewise scales). Their formula governs their forms.
  • There is no sound linear conversion between a 10-point CGPA and a US 4.0 GPA. Grading severity differs too much; evaluation services exist precisely because the mapping needs course-level judgement.

For raw mark-to-percentage arithmetic along the way, the percentage calculator covers the three standard forms.

Planning with your GPA

GPA is an average with inertia: the credits already banked anchor it. Early terms move it violently, a bad first semester is very recoverable, while by final year even a perfect term shifts it by decimals. Two practical tools follow from this. First, target-setting per course: the final grade calculator tells you the exam score a target grade requires while the term is still live, which is when the information is useful. Second, prioritise by credits when time is scarce in exam season, an hour spent on a 4-credit course buys four times the GPA effect of the same hour on a 1-credit one. Deadline math for the study plan itself is what the days between dates calculator is for.

Frequently asked questions

How is GPA calculated?

GPA = Σ(grade points × credits) ÷ Σ(credits). Each course’s grade points are multiplied by its credit hours, the products are summed, and the total is divided by total credits. An A (4.0) in a 3-credit course plus a B (3.0) in a 1-credit lab: (4.0×3 + 3.0×1) ÷ 4 = 3.75, not the 3.5 a simple average of the two grades would give.

Why do credits matter so much?

Because they are the weights. A 4-credit core course influences your GPA four times as much as a 1-credit seminar. The most common GPA mistake is averaging grades directly, ignoring credits, it flatters you when your best grades came in light courses and understates you in the opposite case. Registrars always weight by credits; your own arithmetic should too.

What is the difference between weighted and unweighted GPA?

In US high schools, unweighted GPA caps every course at 4.0, while weighted GPA grants honors/AP/IB courses a bonus, an A in an AP class often counts 5.0. That is a different sense of “weighted” from credit-weighting, which applies everywhere. Colleges typically recalculate applicants’ GPAs under their own system, so know which number a given scale is asking for.

How does CGPA convert to percentage in India?

The CBSE convention is percentage ≈ CGPA × 9.5, a CGPA of 8.2 is roughly 77.9%. The 9.5 factor came from CBSE mapping average marks of students in each grade band, so it is an estimate, not an identity. Universities and employers largely accept it, but some institutions publish their own conversion formula, theirs wins for their paperwork.

How do 4.0 and 10-point scales compare?

They do not convert linearly, and no universal formula exists. A 9.0/10 in a tough Indian program is not simply a 3.6/4.0. For US graduate admissions, most universities ask for the GPA in its original scale plus the transcript, or use services like WES that evaluate course-by-course. If you must state an approximation, label it as one and cite the method.

Can I raise my GPA quickly?

The mechanics are against you: GPA is a credit-weighted average, so the more credits you have banked, the less each new term moves it. With 90 credits at 3.0, a perfect 4.0 across a 15-credit term lifts you only to about 3.14. Retake policies that replace (rather than average) a failed grade are the biggest lever where they exist, check your institution’s rules.

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