Hi Indie Hackers, I’m building GPACalc — a free, browser-based GPA/CGPA calculator designed for students who need school-specific grading scales, not one generic formula.
Product: https://gpacalc.app Source code: https://github.com/Yida-Dev/gpa-calculator
Most GPA tools online are fine if your school uses a simple default 4.0 setup. But in reality, students across Singapore, Malaysia, India, and even different schools in the US often use different grading rules, credit systems, and conversion expectations. That mismatch is exactly why I built GPACalc.
The core problem is simple: when students search “GPA calculator,” they usually get a tool that assumes one default grading system, doesn’t match their school’s actual grade points, and doesn’t help much with semester planning. GPA is not just a number — it affects scholarships, internships, applications, and confidence. If the calculator logic is off, planning decisions can be off too.
GPACalc helps students plan outcomes, not just compute one-time results. Users can enter their current CGPA, completed credits, and expected grades for the current term, then project cumulative GPA in real time. The tool supports 18+ institutions/scales, including common systems used in Singapore (universities and polytechnics), Malaysia, India (10.0 CGPA), and the US (4.0 GPA).
A key feature is what-if planning. Students can test scenarios like: what happens if one module drops from A- to B+, how much a 4-credit course changes final CGPA, or what grades are needed next semester to hit a target GPA. It also includes GPA-to-percentage and percentage-to-GPA conversion, plus shareable result cards for discussions with peers or mentors.
The product is intentionally low-friction: no sign-up, no paywall, free to use, and fully browser-based.
Who it’s for: university students, polytechnic students, students preparing for internships/scholarships/postgrad, and anyone who needs realistic GPA planning across non-uniform grading systems.
Why I built it: I kept seeing students use generic calculators and then manually “adjust” results because the school scale didn’t match. That creates confusion and unnecessary stress. GPACalc is built for clarity, school fit, and practical planning.
Tech stack: Astro, Tailwind CSS, Cloudflare Pages. I optimized for speed and simplicity so users can get answers fast and I can keep iterating quickly.
Current stage: live and free today. I’m now improving school coverage, scenario-planning UX, conversion explainability, and share/export polish.
I’d love feedback on five things: onboarding clarity, scenario-planning UX, which school systems to add next, trust/explainability of conversion logic, and distribution ideas to reach students who actually need this.
If you try it, I’d really appreciate direct feedback, especially edge cases where the logic should be improved. https://gpacalc.app
