The simple interest formula is Interest = P * R * T. Many, or all, of the products featured on this page are from our advertising partners who compensate us when you take certain actions on our ...

Editor's Note: APYs listed in this article are up-to-date as of the time of publication. They may fluctuate (up or down) as the Fed rate changes. CNBC Select will update as changes are made public.

Michael Boyle is an experienced financial professional with more than 10 years working with financial planning, derivatives, equities, fixed income, project management, and analytics. Inflation is the ...