Calculate compound interest and see how your investments grow. Free compound interest calculator with yearly breakdown.
Compound interest is the closest thing investing has to magic: you earn returns not just on your money, but on your previous returns. Enter what you'd invest, add a monthly contribution, pick a rate, and watch the year-by-year table. The numbers get silly — in a good way.
Here's the part that surprises everyone: $200/month at 7% for 30 years grows to roughly $240,000. Start just 10 years later with the same monthly amount? Under $110,000. Time does more heavy lifting than the dollar amount — which is why "start now, even small" beats "start big, later" almost every time.
A quick note: this is a math projection for learning, not financial advice. Real returns bounce around — talk to a professional about your situation.
Earning interest on your interest. Each year's gains get added to the pot, so growth accelerates over time.
7% is the classic long-term stock market estimate after inflation. Savings accounts pay much less — check your bank's actual rate.
No — it's an educational calculator. For real decisions, talk to a qualified financial advisor.
Explore our full collection of free online tools — from image compressors to business calculators, all free and no signup required.