ganak.appCompound Interest Calculator
Calculate compound interest with multiple compounding frequencies (annually, semi-annually, quarterly, monthly, daily, continuously). See how your money grows exponentially over time with the power of compounding.
| Year | Principal | Cumulative Interest | Total Value |
|---|---|---|---|
| 1 | $10,000 | +$500 | $10,500 |
| 2 | $10,000 | +$1,025 | $11,025 |
| 3 | $10,000 | +$1,576 | $11,576 |
| 4 | $10,000 | +$2,155 | $12,155 |
| 5 | $10,000 | +$2,763 | $12,763 |
Compound Interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, which only earns interest on the principal, compound interest allows your money to grow exponentially over time.
Albert Einstein reportedly called compound interest "the eighth wonder of the world." The magic of compounding means that even small amounts can grow into substantial sums given enough time. This makes it a powerful tool for long-term savings and investments, but it can also work against you with debt.
A = Final amount (principal + interest)
P = Principal (initial investment)
r = Annual interest rate (as a decimal, e.g., 5% = 0.05)
n = Number of compounding periods per year
t = Time period in years
Example Calculation:
If you invest $10,000 at 5% annual interest compounded monthly for 10 years:
A = $10,000 × (1 + 0.05/12)^(12×10)
A = $10,000 × (1.00417)^120
A = $16,470.09
Compound Interest = $16,470.09 - $10,000 = $6,470.09
| Frequency | n (per year) | Final Amount | Interest Earned |
|---|---|---|---|
| Annually | 1 | $16,288.95 | $6,288.95 |
| Semi-Annually | 2 | $16,386.16 | $6,386.16 |
| Quarterly | 4 | $16,436.19 | $6,436.19 |
| Monthly | 12 | $16,470.09 | $6,470.09 |
| Daily | 365 | $16,486.65 | $6,486.65 |
| Continuously | ∞ | $16,487.21 | $6,487.21 |
| Feature | Compound Interest | Simple Interest |
|---|---|---|
| Calculation basis | Principal + accumulated interest | Principal only |
| Growth pattern | Exponential (accelerating) | Linear (constant) |
| Total interest earned | Higher over time | Lower over time |
| Best for | Long-term savings, investments | Short-term loans, quick estimates |
| Formula | P × (1 + r/n)^(nt) - P | P × r × t |
| $10K at 5% for 10 years | $6,289 interest (annual) | $5,000 interest |
Savings Accounts
Most savings accounts, CDs, and high-yield accounts compound interest daily or monthly, helping your savings grow faster.
Investments & 401k
Stocks, mutual funds, and retirement accounts benefit from compound returns when dividends are reinvested.
Mortgages & Loans
Most loans use compound interest, which is why paying extra principal early can save significant interest over time.
Education Savings
529 plans and education savings accounts use compound growth to build college funds over many years.
Start Early
Time is your greatest ally with compound interest. Starting even 5 years earlier can result in tens of thousands more at retirement.
Choose Higher Frequency
When comparing accounts with similar rates, prefer daily or monthly compounding over annual for better returns.
Reinvest Dividends
Configure your investment accounts to automatically reinvest dividends and interest to maximize compounding.
Pay Down Debt Faster
Compound interest works against you with debt. Pay extra principal early to reduce the compounding effect.