Investment Calculator
See how your savings grow over time with compound interest and regular contributions.
Future value: 19,318.14
Total contributed: 13,000
Total interest earned: 6,318.14
Growth over time
Year-by-year breakdown
| Year | Contributions | Interest | Balance |
|---|---|---|---|
| 1 | 2,200 | 111.55 | 2,311.55 |
| 2 | 3,400 | 317.91 | 3,717.91 |
| 3 | 4,600 | 625.94 | 5,225.94 |
| 4 | 5,800 | 1,042.98 | 6,842.98 |
| 5 | 7,000 | 1,576.92 | 8,576.92 |
| 6 | 8,200 | 2,236.2 | 10,436.2 |
| 7 | 9,400 | 3,029.89 | 12,429.89 |
| 8 | 10,600 | 3,967.71 | 14,567.71 |
| 9 | 11,800 | 5,060.07 | 16,860.07 |
| 10 | 13,000 | 6,318.14 | 19,318.14 |
About this tool
This calculator projects the future value of an investment that starts with an initial lump sum and grows through both compound interest and optional regular monthly contributions.
Compound interest means you earn returns not just on your original investment, but also on the returns it has already accumulated — which is why growth accelerates the longer money stays invested.
This tool assumes a constant annual return, compounded monthly, for simplicity. Real investments fluctuate year to year, so treat the result as an estimate rather than a guarantee.
Worked example
- 1Enter your initial investment, any monthly contribution, the expected annual return, and the number of years.
- 2The calculator compounds the initial amount and each monthly contribution separately, then adds them together for the total future value.
- 3Example: $1,000 initial plus $100 a month at 7% for 10 years grows to roughly $18,000, of which about $5,000 is interest earned.
Formula
Future value = P×(1+r)^n + C×(((1+r)^n − 1)/r), where P = initial amount, C = monthly contribution, r = monthly rate, n = number of months
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Frequently asked questions
- What is compound interest?
- Compound interest is interest calculated on both the original amount invested and the interest it has already earned, so the balance grows faster over time than with simple interest.
- Does this account for inflation?
- No — the result is shown in today's currency value with no adjustment for inflation, which will reduce the real purchasing power of the future amount.
- What if my rate of return isn't constant every year?
- This calculator assumes a constant average annual return for simplicity. Real markets go up and down, so an average return over many years is more realistic than any single year's return.
- Can I use this for retirement savings?
- Yes — entering your current savings, a planned monthly contribution, an expected average return and the number of years until retirement gives a reasonable estimate of your future balance.