Compound Interest Calculator
Compound interest means you earn interest on your interest. Over long periods it can do more of the work than your own deposits. Enter a starting amount, a monthly contribution, a yearly rate and the number of years to see how the balance could grow.
Balance after 15 years$31,536
You put in$19,000
Interest earned$12,53640% of the final balance
Interest compounded monthly at a fixed rate. Real returns change from year to year and investments can lose value; this is an illustration, not financial advice.
How the calculator works
- Interest is added monthly at one twelfth of the yearly rate, and your contribution is added at the end of each month.
- The chart compares your balance with the money you actually put in — the gap between the lines is interest.
- Real returns vary. Savings accounts pay a fairly steady rate; investments go up and down and can lose value.
Read more on this topic
Frequently asked questions
What rate should I use?
For a savings account, use its current yearly rate. For investments, use a cautious long-term assumption and remember that past returns do not guarantee future ones.
What about inflation?
Inflation reduces what your money can buy. Subtracting the expected inflation rate from your return gives a rough real growth rate.
More tools
Jordan Pass Calculator: Does It Save You Money?50/30/20 Budget CalculatorFreelance Hourly Rate CalculatorScam or Legit? The 10-Message Phishing TestSubscription Cost Calculator: What Do Your Apps Really Cost?Jordan Net Salary Calculator (2026): Income Tax and Social SecurityUAE Gratuity Calculator (2026): End-of-Service BenefitSaudi End-of-Service Calculator (2026): Award Under the Labor LawSaudi Salary Calculator (2026): GOSI Deductions and Net Pay