Free Student Calculators — Percentage, CGPA & Attendance
Free online calculators for Indian students: marks-to-percentage, CGPA to percentage (CBSE 9.5 rule) and back, and an attendance "can I bunk?" calculator. Instant, no signup, no ads.
✓ 100% Free
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✓ NCERT / CBSE Aligned
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TL;DR: Free online calculators for Indian students: marks-to-percentage, CGPA to percentage (CBSE 9.5 rule) and back, and an attendance "can I bunk?" calcula…
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
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What the calculators do
Three specific calculators built around numbers Indian students actually need to work out regularly: converting marks to percentage, converting CGPA to percentage under the CBSE 9.5 rule (and back), and an attendance calculator that answers "how many classes can I skip and stay above 75%?"
- CGPA-to-percentage conversion follows the official CBSE formula (Percentage = CGPA × 9.5), not an approximation.
- The attendance calculator takes your current attended/total classes and a target percentage, then computes exactly how many more you can miss.
- All three run instantly in the browser with no ads interrupting the result.
Cost and access
Free, no signup, no ads.