The formula for calculating savings account interest uses the initial deposit, the annual interest rate and the years of growth. Compound interest earns the account holder more than simple interest ...

David Kindness is a Certified Public Accountant (CPA) and an expert in the fields of financial accounting, corporate and individual tax planning and preparation, and investing and retirement planning.

Learn how to calculate principal and interest on loans, including simple interest and amortized loans, and understand the impact on your monthly payments and loan costs.

IRR measures the rate needed to break even on an investment. Calculate IRR by setting NPV to zero and solving for the discount rate. Use Excel's IRR function by inputting initial cost and cash inflow.