Compound Interest Calculator

Compound interest is interest calculated on the initial principal and on the accumulated interest of previous periods. It's the engine that powers long-term wealth — what Einstein reportedly called the eighth wonder of the world.

A = P × (1 + r/n)^nt

where P is principal, r is annual rate (decimal), n is compounding frequency per year, and t is years.

• The more frequently interest compounds, the higher the final amount.
• Most banks compound FDs quarterly.
• Mutual fund returns compound continuously through NAV growth.
• PPF compounds annually.