Compound Interest Calculator
Calculate how your savings or investment grows with compound interest, including regular monthly contributions and your chosen compounding frequency.
🔒 Runs 100% in your browser — nothing is uploaded
About the compound interest calculator
See how savings or investments grow over time thanks to compound interest — interest earned on your interest. Enter a starting amount, an optional monthly contribution, an interest rate and a time horizon, and choose how often interest compounds. The results are estimates for illustration and assume a constant rate; actual returns vary.
Frequently asked questions
What is compound interest?
Compound interest is interest earned on both your original money and the interest it has already earned. Over time this snowball effect makes savings grow faster than simple interest.
Does this include regular contributions?
Yes. Add a monthly contribution and the calculator includes those deposits and the interest they earn.
Is this financial advice?
No. This is an estimate for illustration only. Real returns vary and are not guaranteed. Consider speaking with a qualified financial professional.