Test your knowledge of compound interest, the Rule of 72, and related investing concepts in our most popular investing quiz! There’s a trick question – can you spot it?

Use our compound interest calculator to see how your savings or investments might grow over time using the power of compound interest

Free compound interest calculator to find the interest, final balance, and schedule using either a fixed initial investment and/or periodic contributions.

See How Finance Works for the compound interest formula, (or the advanced formula with annual additions), as well as a calculator for periodic and continuous compounding.

Use our compound interest calculator to see how your savings can grow over time. Calculate returns with different contribution amounts, interest rates, and compounding frequencies.

Compounding interest calculator: Use this calculator to determine how much your money can grow with compound interest.

Dec 29, 2025 · Our compound interest calculator shows exactly how your savings or debt will grow. Enter your starting amount, contributions and rate of return to see how different timeframes and …