TDS applicable as per current rules. FD Calculator - Calculate fixed deposit interest rates and maturity amount online at HDFC bank. Use FD Calculator & calculate maximum interest earned on your investment. Using an FD calculator is typically a straightforward process: Enter the deposit amount. Specify the tenure in months or years. Choose the compounding frequency (monthly, quarterly, or yearly). View the calculated maturity amount and interest earned. HDFC FD Calculator : Calculate your fixed deposit interest and maturity instantly. Plan your savings with accurate results and updated rates.