Compound Interest Calculator
See how your savings grow over time with interest on interest and optional monthly deposits.
Questions
What is compound interest?
Interest that is added to your balance and then earns interest itself. Over many years this snowball effect makes savings grow faster than simple interest.
What is the formula?
For a lump sum: A = P × (1 + r/n)^(n×t), where P is the amount, r the annual rate, n the times compounded per year and t the years. This calculator also adds monthly deposits.
Are the results guaranteed?
No. Real rates change, and taxes and fees are not included. Use it to compare scenarios, not as a forecast.