How Much Will My Money Grow Calculator
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Reviewed by Calculator Editorial Team
Use this calculator to estimate how much your money will grow over time with compound interest. Simply enter your initial investment, expected annual return, and investment period to see your projected future value.
How the Calculator Works
The calculator uses the compound interest formula to determine your money's future value. Compound interest means your earnings earn interest over time, leading to exponential growth.
Formula
Future Value = P × (1 + r/n)^(nt)
Where:
- P = Principal amount (initial investment)
- r = Annual interest rate (decimal)
- n = Number of times interest is compounded per year
- t = Time the money is invested for (in years)
For simplicity, this calculator assumes annual compounding (n=1). The result shows your money's estimated growth without accounting for inflation or taxes.
Understanding Compound Interest
Compound interest is the interest calculated on the initial principal and also on the accumulated interest of previous periods. This creates exponential growth over time.
Example: If you invest $10,000 at 5% annual interest, you'll earn $500 the first year. The next year, you'll earn $500 on the original $10,000 plus the $500 you earned, totaling $525.
Compound interest is why saving early can lead to significantly larger returns than saving later. The "rule of 72" can help estimate how long it takes for your money to double at a given interest rate.
Worked Example
Let's say you invest $5,000 at an annual return of 6% for 10 years.
| Year | Starting Balance | Interest Earned | Ending Balance |
|---|---|---|---|
| 0 | $5,000.00 | $0.00 | $5,000.00 |
| 1 | $5,000.00 | $300.00 | $5,300.00 |
| 2 | $5,300.00 | $318.00 | $5,618.00 |
| 3 | $5,618.00 | $337.08 | $5,955.08 |
| 4 | $5,955.08 | $357.30 | $6,312.38 |
| 5 | $6,312.38 | $382.34 | $6,694.72 |
| 6 | $6,694.72 | $409.68 | $7,104.40 |
| 7 | $7,104.40 | $437.26 | $7,541.66 |
| 8 | $7,541.66 | $465.30 | $7,996.96 |
| 9 | $7,996.96 | $495.82 | $8,492.78 |
| 10 | $8,492.78 | $509.57 | $9,002.35 |
After 10 years, your $5,000 investment would grow to approximately $9,002.35 at a 6% annual return.
Frequently Asked Questions
How accurate is this calculator?
This calculator provides an estimate based on the compound interest formula. Actual results may vary due to market conditions, fees, taxes, and other factors not accounted for in this simple model.
Does this calculator account for inflation?
No, this calculator shows nominal growth without adjusting for inflation. For real growth, you would need to subtract the inflation rate from the investment return.
What's the difference between APY and APR?
APR (Annual Percentage Rate) is the simple interest rate, while APY (Annual Percentage Yield) includes the effect of compounding. APY is always higher than APR for the same rate.
How often should I compound my investments?
The more frequently you compound interest (daily, monthly, annually), the faster your money grows. However, the difference diminishes with higher compounding frequencies.