Compound Interest Calculator
See how your savings grow with compound interest over time.
Enter your values to calculate your result.
Formula
A = P × (1 + r/n)^(n×t)
A is the final amount, P is the starting principal, r is the annual interest rate, n is how many times per year interest compounds, and t is the number of years.
Example
$10,000 at 5% annual interest, compounded monthly (n = 12), grows to about $16,470.09 after 10 years — $6,470.09 in interest.
Frequently Asked Questions
What compounding frequency should I use?
12 for monthly (most savings accounts), 4 for quarterly, 1 for annually, or 365 for daily. More frequent compounding earns slightly more interest at the same rate.
Does this include additional contributions?
No — this assumes a single starting amount with no further deposits. Use the Future Value Calculator for regular monthly contributions.