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Compound Interest Calculator
Calculate how your savings and investments grow over time with the power of compound interest. Add monthly contributions to see the full picture.
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Results
- Future Value
- $54,713.58
- Total Contributions
- $34,000.00
- Total Interest Earned
- $20,713.58
- Interest as % of Total
- 37.9%
- Effective Annual Rate (EAR)
- 7.229%
- Rule of 72 — Years to Double
- 10.3 years
Investment Growth Over Time
View Year-by-Year Breakdown (10 years)
| Year | Balance | Contributions | Interest Earned |
|---|---|---|---|
| 1 | $13,201.42 | $12,400.00 | $801.42 |
| 2 | $16,634.27 | $14,800.00 | $1,834.27 |
| 3 | $20,315.28 | $17,200.00 | $3,115.28 |
| 4 | $24,262.39 | $19,600.00 | $4,662.39 |
| 5 | $28,494.83 | $22,000.00 | $6,494.83 |
| 6 | $33,033.24 | $24,400.00 | $8,633.24 |
| 7 | $37,899.74 | $26,800.00 | $11,099.74 |
| 8 | $43,118.03 | $29,200.00 | $13,918.03 |
| 9 | $48,713.55 | $31,600.00 | $17,113.55 |
| 10 | $54,713.58 | $34,000.00 | $20,713.58 |
Frequently Asked Questions
How to Use the Compound Interest Calculator
- 1.Enter your starting balance in Initial Investment (can be $0 if starting from scratch).
- 2.Add a Monthly Contribution — how much you plan to add each month.
- 3.Enter your Annual Interest Rate — use your savings account APY or a historical average (7% for US stocks).
- 4.Set the number of Years you plan to invest.
- 5.Choose a Compounding Frequency — monthly is standard for most savings accounts.
- 6.Results update instantly. Expand Year-by-Year Breakdown to see your balance at each milestone.