Methodology
Methodology is the exact logic behind every GPACalc result: the formulas, the scales and the rules for choosing sources.
Last reviewed: November 7, 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 show two decimals; school pages apply each school's published rounding where it states one.
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
- 4.0 scale baseline: GPA = Percentage / 25
- 5.0 scale baseline: GPA = Percentage / 20
- 10.0 scale baseline: CGPA = Percentage / 9.5
- School pages use each school's own bands where it publishes them.
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.
- School mappings are updated when policies change.
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. School pages use each school's own bands where it publishes them.
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.
Why can a school's published GPA show a different last digit?
Schools apply their own rounding, truncation and grade replacement rules. Each school page states the rules that school publishes, including S/U, pass/fail and repeated courses.
How often are grading scales reviewed?
School pages are checked against official sources, with the date shown on each page, and updated when a grading policy changes. Users can report outdated data through the contact page.
Updated by Yida, independent developer. Formulas: GPACalc Methodology.