Marks, CGPA, attendance, exam scores and age, accurate, free, and everything runs in your own browser.
Convert CGPA or SGPA to percentage with official formulas for 45+ Indian universities.
Open calculator →Turn your marks into a percentage for any board, class or exam.
Open calculator →Check your attendance percentage, how many classes you need, and how many you can skip.
Open calculator →Calculate your JEE Main or NEET score with accurate negative marking.
Open calculator →Find your exact age from your date of birth, or the difference between two dates.
Open calculator →Examfo is a small set of free online calculators built for the things Indian students actually need to work out: what percentage your marks come to, what your CGPA converts to, whether your attendance clears 75%, what you scored in JEE or NEET, and how old you are on a given date.
Each tool does one job properly rather than many jobs approximately. They are deliberately plain, load fast on a phone, and show the formula alongside the answer so you can check the arithmetic yourself instead of trusting a number that appeared from nowhere.
Converts CGPA or SGPA into a percentage using your own university's formula, covering more than 45 Indian universities. This matters more than people expect: an 8.5 CGPA is 80.75% under the CBSE formula but 71.35% under Mumbai University's. It also converts percentage back to CGPA, combines semester SGPAs into a credit-weighted CGPA, and estimates a US 4.0-scale GPA.
Turns marks into a percentage for any total, 500, 600, 1000 or a single test out of 20. It has a subject-wise mode for when your papers carry different maximum marks, which is where averaging subject percentages quietly gives the wrong answer.
Three modes: your current attendance percentage, how many classes you still need to reach 75%, and how many you can afford to miss. The second one uses the correct formula, which many attendance tools get wrong by ignoring that every future class you attend is also a class that gets held.
Calculates your raw score from your correct, wrong and unattempted counts, with current NTA negative marking. It reflects the 2025 rule change under which incorrect numerical answers in JEE Main now carry the same penalty as MCQs: a point older calculators still get wrong.
Gives your exact age in years, months and days from a date of birth, plus totals in months, weeks, days and hours, and a countdown to your next birthday. You can set an "as on" date for eligibility cut-offs, and compare two dates to find an age difference.
A calculator that only prints a number is impossible to check. Every tool here displays the formula it used with your actual numbers substituted, so if the answer looks wrong you can see exactly why. On the CGPA converter we go a step further and mark each university formula as verified or as needing your own confirmation, because published sources genuinely disagree for several universities and we would rather say so than quietly pick one.
None of these calculators send your input anywhere. There is no account, no database and no server-side processing: the JavaScript on the page does the maths and the result never leaves your browser. The only thing stored locally is your recent conversion history on the CGPA page, which you can clear at any time. See the privacy policy for the full detail.
Yes. Every calculator on this site is completely free, with no signup, no login and no usage limit. Nothing is paywalled and there is no app to install.
No. Every calculation runs inside your own browser using JavaScript. Your marks, CGPA, attendance figures and date of birth are never sent to our servers, because there is no server-side calculation at all.
Treat every result as an estimate for your own planning. For transcripts, job applications and admission forms, use the figure your school, board or university officially issues. This matters most for CGPA conversion, where different universities publish different formulas.
The marks calculator works with any board because you enter your own total. The CGPA converter carries formulas for more than 45 Indian universities including CBSE, VTU, SPPU, MAKAUT, GTU, Mumbai University, Anna University, AKTU and KTU, plus a custom multiplier option.
Yes. Every tool is built mobile-first and works in any phone browser without installing anything. Because the maths runs locally, they also keep working on a weak connection once the page has loaded.