Compound Interest Calculator
Calculate investment growth with compound interest
$
%
years
Regular Contributions
$
Result
Final Amount
$37,506.06
Total Interest Earned
$15,506.06
Net Contributions
$12,000.00
APY (Effective Rate)
7% → 7.23%
Rate of Return
70.48%
Time to Double
10y 3mo
Initial Investment
$10,000.00
Yearly Breakdown
| Year | Balance | Total Interest |
|---|---|---|
| 1 | $11,969.39 | $769.39 |
| 2 | $14,081.14 | $1,681.14 |
| 3 | $16,345.56 | $2,745.56 |
| 4 | $18,773.67 | $3,973.67 |
| 5 | $21,377.31 | $5,377.31 |
| 6 | $24,169.16 | $6,969.16 |
| 7 | $27,162.84 | $8,762.84 |
| 8 | $30,372.93 | $10,772.93 |
| 9 | $33,815.08 | $13,015.08 |
| 10 | $37,506.06 | $15,506.06 |
Frequently Asked Questions
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest (calculated only on principal), compound interest grows exponentially over time, making it powerful for long-term investments.
More frequent compounding leads to higher returns. For example, $10,000 at 5% annual interest for 10 years yields: $16,289 with annual compounding, $16,436 with monthly compounding, and $16,487 with daily compounding. The difference grows larger over longer time periods.
The Rule of 72 is a quick way to estimate how long it takes to double your money. Divide 72 by your annual interest rate: at 6% interest, your money doubles in about 12 years (72÷6=12). At 8%, it takes about 9 years. This rule works best for rates between 6-10%.
Regular contributions dramatically accelerate wealth building. For example, $10,000 invested at 7% for 20 years grows to $38,697. But adding just $200/month transforms that into $142,797. The key is starting early and contributing consistently.
APR (Annual Percentage Rate) is the simple interest rate without compounding. APY (Annual Percentage Yield) includes the effect of compounding. For example, 12% APR compounded monthly equals 12.68% APY. When comparing investments, always compare APY to APY.
About Our Financial Tools
Our financial calculators are designed to help you make informed decisions about your money. Whether you're converting currencies for travel or business, calculating investment returns, or planning loan payments, our tools provide accurate, instant results.
All calculations are performed securely in your browser. We don't store any of your financial data. Our currency exchange rates are updated regularly to ensure you get the most accurate conversions possible.