PPF interest is calculated monthly on the lowest balance between the end of the 5th day and last day of month, however the total interest in the year is added back to PPF only at the year end
PPF Calculator Calculate Public Provident Fund Online
PPF Calculator – Public Provident Fund Calculator Online
Procedure to calculate PPF interest and posting at SO
PPF Calculator - Calculate PPF Interest, Returns & Maturity Online
PPF Calculator – FilingMan
PPF Interest Rate Calculator, Public Provident Fund Interest Calculator
PPF Interest Calculation Examples - ₹5000 for 1-15 Years
₹1000 PPF Interest Calculation for 15 Years - FinCalC Blog
PPF Calculator to Calculate PPF Deposit Interest & Principal Amount
Is PPF a Good Investment Tool? - Formula to Calculate, Interest Earned, & Calculator.