Compound Interest Calculator
Future value with principal, rate, time, and compounding.
See how compound interest grows a balance
Enter a starting amount, annual interest percent, time in years, and how often interest is added. The result uses A = P(1 + r/n)^(nt).
Useful for savings accounts, deposits, and long-term planning. Fees and taxes are not included.
For monthly investing, try the SIP calculator.
compound interest calculator FAQ
Fill in the fields above. The result updates as you type. Empty fields stay blank until you enter a valid number or text.
Yes. Every SmartToolX calculator and converter is free. There is no paywalled result.
No. Inputs stay in your browser unless a tool needs a public API, such as live currency rates or QR image rendering.
We use the same published formulas you would expect from a standard compound interest calculator. Always double-check medical, legal, or large money decisions.