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See how your investments grow over time with the power of compound interest. Enter your initial investment, monthly contributions, and expected return to get a detailed year-by-year breakdown.
Final Balance
$343,778.24
Total Contributions
$130,000.00
Total Interest Earned
$213,778.24
Interest % of Balance
62.2%
| Year | Starting Balance | Contributions | Interest | Ending Balance |
|---|---|---|---|---|
| 1 | $10,000.00 | $6,000.00 | $1,054.96 | $17,054.96 |
| 2 | $17,054.96 | $6,000.00 | $1,640.52 | $24,695.47 |
| 3 | $24,695.47 | $6,000.00 | $2,274.68 | $32,970.15 |
| 4 | $32,970.15 | $6,000.00 | $2,961.47 | $41,931.62 |
| 5 | $41,931.62 | $6,000.00 | $3,705.27 | $51,636.89 |
| 6 | $51,636.89 | $6,000.00 | $4,510.80 | $62,147.68 |
| 7 | $62,147.68 | $6,000.00 | $5,383.19 | $73,530.87 |
| 8 | $73,530.87 | $6,000.00 | $6,327.99 | $85,858.86 |
| 9 | $85,858.86 | $6,000.00 | $7,351.21 | $99,210.07 |
| 10 | $99,210.07 | $6,000.00 | $8,459.35 | $113,669.42 |
| 11 | $113,669.42 | $6,000.00 | $9,659.47 | $129,328.89 |
| 12 | $129,328.89 | $6,000.00 | $10,959.20 | $146,288.09 |
| 13 | $146,288.09 | $6,000.00 | $12,366.80 | $164,654.89 |
| 14 | $164,654.89 | $6,000.00 | $13,891.24 | $184,546.13 |
| 15 | $184,546.13 | $6,000.00 | $15,542.20 | $206,088.33 |
| 16 | $206,088.33 | $6,000.00 | $17,330.19 | $229,418.52 |
| 17 | $229,418.52 | $6,000.00 | $19,266.59 | $254,685.10 |
| 18 | $254,685.10 | $6,000.00 | $21,363.70 | $282,048.81 |
| 19 | $282,048.81 | $6,000.00 | $23,634.87 | $311,683.68 |
| 20 | $311,683.68 | $6,000.00 | $26,094.55 | $343,778.24 |
Enter your starting investment amount, any recurring monthly contributions, your expected annual interest rate, and the number of years you plan to invest. Select how often your interest compounds — monthly is most common for savings accounts and investment portfolios. The calculator will show you a detailed year-by-year breakdown and a growth chart.
The formula for compound interest with regular contributions is:
A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]
Where:
Albert Einstein allegedly called compound interest the “eighth wonder of the world.” Whether or not the attribution is real, the math is powerful. Over long time horizons, compound interest can turn modest regular contributions into substantial wealth. The key variables are time, rate of return, and consistency of contributions.
Compound interest is the interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, compound interest allows your money to grow exponentially over time.
More frequent compounding results in slightly higher returns because interest is calculated and added to the principal more often. However, the difference between monthly and daily compounding is minimal for most investments.
The S&P 500 has historically returned about 10% annually before inflation, or roughly 7% after inflation. High-yield savings accounts currently offer 4-5%. Conservative bond portfolios may return 3-5%. Choose a rate that matches your investment strategy.
The Rule of 72 is a quick estimation: divide 72 by your annual return rate to find how many years it takes to double your money. At 8%, your money doubles in about 9 years.