Compound Interest Calculator
Calculate how your investment grows over time with the power of compounding.
Investment Details
Final Amount
$22,196.4
Interest Earned
$12,196.4
Principal
$10,000
Growth
122.0%
Growth Chart
- Interest Earned
- Total Value
| Year | Total Value | Interest |
|---|
| Year 1 | $10,830 | $830 |
| Year 2 | $11,728.88 | $1,728.88 |
| Year 3 | $12,702.37 | $2,702.37 |
| Year 4 | $13,756.66 | $3,756.66 |
| Year 5 | $14,898.46 | $4,898.46 |
| Year 6 | $16,135.02 | $6,135.02 |
| Year 7 | $17,474.22 | $7,474.22 |
| Year 8 | $18,924.57 | $8,924.57 |
| Year 9 | $20,495.3 | $10,495.3 |
| Year 10 | $22,196.4 | $12,196.4 |
What is Compound Interest?
Compound interest is the process where interest is calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which is calculated only on the principal, compound interest grows exponentially over time — making it one of the most powerful concepts in personal finance.
Albert Einstein is often quoted as calling compound interest the "eighth wonder of the world." Whether or not he said it, the principle holds true — small amounts invested consistently over long periods can grow into substantial wealth purely through the power of compounding.
Compound Interest Formula
A = P(1 + r/n)^(nt)
How to Use This Calculator
Enter Principal Amount
Input the initial amount you are investing or saving. Use the currency button to switch between USD, EUR, GBP, INR, and JPY.
Set Annual Interest Rate
Use the slider or type directly. For stock market, historically 7–10% is a common estimate.
Choose Time Period
Drag the slider or type up to 50 years. Longer periods show the true power of compounding.
Select Compounding Frequency
Choose how often interest compounds. Monthly compounding grows faster than annual compounding.
View Results
See your final amount, interest earned, and year-by-year growth in the chart and scrollable table.
Frequently Asked Questions
❓ What is the difference between simple and compound interest?
Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal plus all previously earned interest. Over long periods, compound interest grows significantly faster.
❓ How often should interest compound for maximum growth?
The more frequently interest compounds, the more you earn. Daily compounding earns slightly more than monthly, which earns more than annual. However, the difference between daily and monthly is small for most practical purposes.
❓ What is a realistic interest rate to use?
For savings accounts, 3–5% is typical. For index funds tracking the S&P 500, the historical average is around 10% annually before inflation. For conservative planning, many financial advisors suggest using 6–7%.
❓ Can compound interest work against me?
Yes — compound interest works the same way on debt. Credit card debt at 20% APR compounding monthly grows rapidly. This is why paying off high-interest debt is often the best financial move before investing.
❓ What is the Rule of 72?
The Rule of 72 is a quick way to estimate how long it takes to double your money. Simply divide 72 by your annual interest rate. At 8% annual return, your money doubles in approximately 72 ÷ 8 = 9 years.