Compound Interest Calculator
Calculate compound interest with any compounding frequency and optional regular deposits.
Compound interest earns interest on your interest. Choose how often it compounds to see the effect.
ResultUpdates as you type
Enter a positive time period.
Formula
Compound growth
A = P(1 + r/k)^(k·t)k = compounds per year, t = years.Frequently asked questions
Does compounding frequency matter much?
It helps, but with diminishing returns. Moving from annual to monthly compounding makes a noticeable difference; monthly to daily is tiny.
What is APY?
Annual Percentage Yield is the effective yearly rate after compounding: APY = (1 + r/k)^k − 1.