Quickly generate amortization schedules for Fixed Interest, Variable Interest, Rule of 78s and Fixed Interest - Fixed Principal loans, based on 360 or 365 day years, simple interest or compound interest. Loan Parameter Calculators - calculate Principal Balance, Term, Interest Rate or Payment Amount. Multiple payment and compounding frequencies - including: daily, weekly, bi-weekly, semi-monthly, montly, bi-montly, quarterly, semi-annually, and annually. APR Calculator. Per Diem Calculator. Interest Rate Conversion Calculator.