Compound Interest Calculator
See how your money grows over time with compound interest, regular contributions, and different compounding frequencies.
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Enter Your Investment Details
How the Compound Interest Calculator Works
Compound interest is interest calculated on both the initial principal and the interest already earned. Regular contributions accelerate growth by adding new principal that also compounds.
Formula Used
A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) − 1) / (r/n)]
P = initial principal, r = annual rate, n = compounds per year, t = years, PMT = periodic contribution.
Example
$10,000 invested at 7% for 15 years with $200/month added, compounded monthly, grows to roughly $95,000 — more than half of that from interest alone.
Practical Use
Use this calculator to compare how compounding frequency and consistent contributions change your long-term returns.
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