National Institute of Educational Planning and Administration (NIEPA), New Delhi: CGPA to percentage

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Percentage—
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CGPA—

Formula: Piecewise (NIEPA Table 2, 9-point scale): CGPA 0.5–7.4 → 5 × CGPA + 37.5; 7.5–8.4 → 10 × CGPA; 8.5–9.0 → 30 × … (full rule on the page)
Official formula · source document

Full details and worked examples · GPACalculatorHQ