Financial calculator (business calculator), is an electronic tool, that allows calculating financial functions. It is used to calculate different parameters like- Future Value of an investment or return on an investment, present value of an investment, interest rate charged, number of compounding periods, annuity payment, and principal repayment, principal balance, etc. Some of the commonly used financial calculators are SIP Calculator, FD Calculator, RD Calculator, PPF Calculator, EMI Calculator, Loan Comparison, Loan Eligibility etc.