Salary hike percentage is calculated as: ((New Salary – Old Salary) ÷ Old Salary) × 100. For example, if your current CTC is ₹6,00,000 and your new CTC is ₹7,20,000, the hike percentage is ((7,20,000 – 6,00,000) ÷ 6,00,000) × 100 = 20%. Alternatively, if you know the hike percentage, the new salary is calculated as: Old Salary × (1 + Hike% ÷ 100).