Methodology
This page explains the exact logic used by GPACalc so users can verify assumptions before relying on results.
Last reviewed: February 13, 2026
Core Formula for CGPA Projection
New CGPA = (Current CGPA x Current Credits + Semester Grade Points) / (Current Credits + Semester Credits)
- Semester Grade Points = Sum of (grade point x module credit) for all modules entered.
- Each grade point comes from the selected grading scale.
- Results are estimates for planning and may differ from institution-specific rounding rules.
GPA to Percentage
- 4.0 scale baseline: Percentage = GPA x 25
- 5.0 scale baseline: Percentage = GPA x 20
- 10.0 scale baseline: Percentage = GPA x 9.5
Percentage to GPA
- Linear estimate: GPA = (Percentage / 100) x Scale
- Supports 4.0, 5.0, and 10.0 scales.
- Some schools use band-based conversion, so official policy overrides this estimate.
Scale and Source Rules
- School-grade mappings are maintained from publicly available institution grading references.
- When official school documentation conflicts with a generic formula, school policy is treated as authoritative.
- We periodically review school mappings and adjust when policies change.
Limitations
- GPACalc does not issue official grades or transcripts.
- Institution-specific exceptional rules are not always captured in generic calculators.
- Use GPACalc for planning, then verify with your school handbook or registrar for official decisions.
Frequently Asked Questions
What formula does GPACalc use for cumulative GPA?
New CGPA = (Current CGPA x Current Credits + Semester Grade Points) / (Current Credits + Semester Credits). Semester Grade Points is the sum of each module grade point multiplied by its credit value.
How does GPACalc convert GPA to percentage?
GPACalc uses scale-specific linear baselines: GPA x 25 for a 4.0 scale, GPA x 20 for a 5.0 scale, and GPA x 9.5 for a 10.0 scale. Some schools use band-based conversion, so always check your institution policy.
Where does GPACalc get its grading data?
School-grade mappings are sourced from publicly available institution grading references such as registrar pages, student handbooks, and academic policies. When official school documentation conflicts with a generic formula, school policy is treated as authoritative.
Can GPACalc results differ from my official transcript?
Yes. GPACalc provides planning estimates. Differences can arise from institution-specific rounding rules, special module treatment (S/U, pass/fail), or grade replacement policies that this calculator does not capture.
How often are grading scales reviewed?
School mappings are reviewed periodically and updated when grading policy changes are reported by users or detected through official source monitoring. Users can report outdated data through the contact page.