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Compound Interest Calculator

See how your money grows over time with the power of compounding. Add regular monthly contributions and get a year-by-year breakdown.

FREE YEAR-BY-YEAR TABLE INSTANT
FINAL BALANCE
TOTAL INVESTED
INTEREST EARNED
Principal & Contributions Interest
Year-by-Year Growth
Year Balance Contributed Interest

๐Ÿ“ The Compound Interest Formula

A = P ร— (1 + r/n)nt
A = Final amount
P = Principal
r = Annual rate (decimal)
n = Compounds/year

Why Compounding Frequency Matters

More frequent compounding means interest earns interest sooner โ€” increasing your effective annual yield.

Annual
Lowest
Quarterly
Moderate
Monthly
Most common
Daily
Higher
Continuous
Theoretical max

The Rule of 72

Divide 72 by your annual interest rate to estimate how many years it takes to double your money.

72 รท 7% โ‰ˆ 10.3 years to double

Typical Return Rates

High-yield savings 3โ€“5%
US Treasury bonds 4โ€“5%
S&P 500 (historical avg) ~10%
S&P 500 (inflation-adj) ~7%
Real estate (avg) 6โ€“8%

Past performance does not guarantee future results.

๐Ÿ’ก The Power of Time

Starting 10 years earlier can double or triple your final balance โ€” even with the same contributions. Time in the market beats timing the market.