Subjects to CGPA Calculator

About this calculator

This calculator turns your per-subject grades into a single CGPA (Cumulative Grade Point Average). For each subject you enter its grade point on the chosen scale and its credit hours; the result is the credit-weighted average of those grade points, plus your percentage and 4.0-scale GPA equivalent. Pick the grading scale that matches your institution — the 10-point CBSE scale used across India, the US 4.0, a 5.0, the Australian 7.0, or the South Korean 4.5.

How to read your results

The headline figure is your CGPA shown against the maximum of the scale you chose, e.g. 9.00 / 10. Below the hero, two stats translate it: the percentage (CGPA × the scale factor) and the 4.0-scale GPA equivalent, alongside your total credit hours. The bar chart shows how much each subject contributed in weighted points — a subject’s bar length is its grade point multiplied by its credits, so a high grade in a heavy course moves your CGPA more than the same grade in a light one. Subjects with more credits dominate the average; that is the whole point of a credit-weighted CGPA.

How it's calculated

For each subject the grade point (0…scale maximum) is multiplied by its credit hours to give weighted points. The CGPA is the sum of weighted points divided by the sum of credits: CGPA = Σ(points × credits) ÷ Σcredits. The percentage is CGPA × factor, where factor is the official CBSE 9.5 on the 10-point scale and the linear 100 ÷ maximum on the others. The 4.0-scale GPA equivalent is (CGPA ÷ maximum) × 4. All inputs are validated: grade points must be within [0, scale maximum] and credits must be greater than 0.

Worked example

Three subjects on the 10-point scale: Maths (grade point 9, 4 credits), Physics (8, 3 credits) and Chemistry (10, 3 credits).

Weighted points = 9×4 + 8×3 + 10×3 = 90 across 10 credits, so CGPA = 90 ÷ 10 = 9.00. Percentage = 9.00 × 9.5 = 85.5% (CBSE factor) and the 4.0-scale equivalent is (9.00 / 10) × 4 = 3.60.

Frequently asked questions

What is a credit-weighted CGPA?

It is the average of your subject grade points weighted by credit hours: CGPA = Σ(grade point × credits) ÷ Σ(credits). A 4-credit subject counts twice as much toward your CGPA as a 2-credit subject, so heavier courses pull the average more strongly. When every subject has the same credits, the credit-weighted CGPA equals the plain arithmetic mean of the grade points.

Which grading scale should I choose?

Choose the scale your institution reports on. The 10-point scale is the CBSE/UGC standard across India; the 4.0 scale is standard in the United States; 5.0 is common in Nigeria; 7.0 is the Australian university scale; and 4.5 is widely used in South Korea. Each subject’s grade point must fall within 0 and that scale’s maximum.

How is the percentage derived?

Percentage = CGPA × the scale factor. On the 10-point scale the factor is the officially published CBSE constant 9.5, so a 9.0 CGPA is 85.5%. On the other scales there is no single official multiplier, so the calculator uses the standard linear rescale (100 ÷ maximum) — for example ×25 on a 4.0 scale. Those non-CBSE percentages are approximate and are labelled as such.

How accurate is the 4.0 GPA equivalent?

It is a proportional rescale: (CGPA ÷ scale maximum) × 4. It gives a useful rough indication when applying internationally, but it is not an official conversion. US universities run their own transcript evaluations and do not universally accept a single formula.

What happens when I switch scales after entering grades?

The calculator keeps your subjects and credits, but any grade point that now exceeds the new scale’s maximum is clamped down to that maximum so the input stays valid. Review your grade points after switching — a 9 on a 10-point scale is not the same achievement as a 9 would be on a 4.5 scale.

Sources

• www.cbse.gov.in/circulars/cir24-2010.pdf
• en.wikipedia.org/wiki/Academic_grading_in_India
• en.wikipedia.org/wiki/Academic_grading_in_the_United_States

Reviewed by the YouCalc Team · Last reviewedMay 24, 2026