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Compound Interest Calculator
See how a lump sum grows over time as interest compounds.
Final amount–
Total contributions–
Total interest earned–
How this is calculated
How compound interest is calculated
Interest earns interest, so the balance grows by a power rather than a multiple:
A = P(1 + r/n)nt
where P is the starting balance, r the annual rate as a decimal, n the number of compounding periods a year, and t the number of years.
Worked example. $1,000 at 7%, compounded annually for 10 years: 1000 × 1.0710 = $1,967.15. Of that, $967.15 is interest, and most of it was earned by earlier interest rather than by the original $1,000.
Educational content only, not financial advice. Results are estimates for learning purposes. Consult a qualified professional before making financial decisions.