CreditCalc

This app contains the following calculators -

Period Rate APR Calculator
Lump Sum APR Calculator
Equal Instalment Calculator
Loan Balance Calculator
Loan Repayment Calculator
Homebuy APR Equivalent Calculator
Annual to Period Rate Calculator

They are based on the work of Brian Stewart @ http://brian-stewart.orpheusweb.co.uk/credit.htm.

Please note the calculations are based on UK terms and may not be applicable in other territories.