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Compound interest calculator
See how your money grows with compounding. Enter a starting amount, rate and monthly contribution — then open Advanced options (free) to set the compounding frequency, escalate your contributions each year, and adjust for inflation. Includes a growth chart and a year-by-year breakdown.
Advanced optionsfree
Future value
$54,714
Total contributions$34,000
Interest earned$20,714
Effective annual yield (APY)7.23%
Growth over time
Year-by-year breakdown
| Year | Contributed | Balance |
|---|---|---|
| 0 | $10,000 | $10,000 |
| 1 | $12,400 | $13,201 |
| 2 | $14,800 | $16,634 |
| 3 | $17,200 | $20,315 |
| 4 | $19,600 | $24,262 |
| 5 | $22,000 | $28,495 |
| 6 | $24,400 | $33,033 |
| 7 | $26,800 | $37,900 |
| 8 | $29,200 | $43,118 |
| 9 | $31,600 | $48,714 |
| 10 | $34,000 | $54,714 |
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Try the business valuation calculator →Frequently asked questions
- What is compound interest?
- Compound interest is interest earned on both your original principal and the interest already added — so growth accelerates over time. More frequent compounding and regular contributions increase the final value.
- How is the future value calculated?
- Future value = principal × (1 + r/n)^(n·t), plus the future value of any monthly contributions, where r is the annual rate, n the compounding periods per year and t the years.
- Can I change the compounding frequency or adjust for inflation?
- Yes — for free. Advanced options let you compound annually, semi-annually, quarterly, monthly or daily, contribute at the start or end of each month, increase your contribution by a set % each year, and see the result in today's money after inflation. The effective annual yield (APY) is shown too.