SGPA and CGPA calculator
SGPA from a semester's credits and grade points, CGPA across semesters, and the percentage using the multiplier your own university's notification gives.
Paste this semester's credits and grade points. The grade point is the number your grade maps to (often O = 10, A+ = 9, A = 8 and so on).
How SGPA is calculated
SGPA (semester grade point average) is a credit-weighted average. Each subject's grade point is multiplied by its credits, the products are added, and the sum is divided by the total credits:
SGPA = Σ (credits × grade point) ÷ Σ credits
A 4-credit subject counts twice as much as a 2-credit one, which is the whole point of the weighting: a lab or a minor elective moves the average less than a core paper. Most Indian universities that follow the UGC's choice-based credit system use a 10-point scale, with letter grades mapped to points (O = 10, A+ = 9, A = 8, B+ = 7, B = 6, C = 5, P = 4, F = 0 is one common mapping). The mapping is on the back of your marks card; use it, not ours.
Worked example
Four subjects: 4 credits at grade point 10, 3 credits at 9, 3 credits at 8, 2 credits at 7. The weighted sum is 40 + 27 + 24 + 14 = 105 and the credits total 12, so SGPA = 105 ÷ 12 = 8.75. Note that the plain average of the grade points (8.5) is lower; the heavier subjects were the better ones.
CGPA across semesters
CGPA is the same weighted average taken over all semesters, weighted by each semester's credits: multiply each SGPA by that semester's total credits, add, and divide by all the credits. Averaging the SGPAs without weights is wrong whenever semesters have different credit loads, which they usually do. Three semesters of 22, 21 and 23 credits with SGPAs 8.75, 8.20 and 8.90 give (192.5 + 172.2 + 204.7) ÷ 66 = 8.63.
Converting CGPA to a percentage
There is no universal formula, and the one you use must be your own university's, because the employer or the scholarship will check it against your transcript. Some universities multiply by 10; some use 9.5, the factor CBSE used for its class 10 CGPA; the state and technical universities publish their own rules, and a few subtract a constant first. The two boxes above take a multiplier and an offset so any of the linear rules can be typed in. Find the rule on your university's examination branch page or on the reverse of the consolidated marks memo, and type that.