Compound interest calculator
What you have to put in today.
At the end of each month.
Optional: raise what you add each year, such as 3%.
A year. Savings average 0.37%; the S&P 500 has returned about 10.7% since 1957.
How long the money grows.
How often interest is added. If your rate is an APY, pick yearly.
In 30 years you'd have
$691,150
You put in $190,000 and interest adds $501,150, 73% of the total. At 7% compounded monthly, your money earns an APY of 7.23%.
- Total contributed
- $190,000
- $10,000 to start + $180,000 added
- Total interest earned
- $501,150
- 264% on top of what you put in
- Doubles in (rule of 72)
- 10.3 years
- 72 ÷ 7. Exactly 9.9 years.
- Annual percentage yield
- 7.23%
- 7% compounded monthly
Year-by-year table
| Year | Added | Interest | Total contributed | Total interest | Balance |
|---|---|---|---|---|---|
| 1 | $6,000 | $919 | $16,000 | $919 | $16,919 |
| 2 | $6,000 | $1,419 | $22,000 | $2,339 | $24,339 |
| 3 | $6,000 | $1,956 | $28,000 | $4,294 | $32,294 |
| 4 | $6,000 | $2,531 | $34,000 | $6,825 | $40,825 |
| 5 | $6,000 | $3,148 | $40,000 | $9,973 | $49,973 |
| 6 | $6,000 | $3,809 | $46,000 | $13,782 | $59,782 |
| 7 | $6,000 | $4,518 | $52,000 | $18,299 | $70,299 |
| 8 | $6,000 | $5,278 | $58,000 | $23,578 | $81,578 |
| 9 | $6,000 | $6,094 | $64,000 | $29,671 | $93,671 |
| 10 | $6,000 | $6,968 | $70,000 | $36,639 | $106,639 |
| 11 | $6,000 | $7,905 | $76,000 | $44,544 | $120,544 |
| 12 | $6,000 | $8,910 | $82,000 | $53,455 | $135,455 |
| 13 | $6,000 | $9,988 | $88,000 | $63,443 | $151,443 |
| 14 | $6,000 | $11,144 | $94,000 | $74,587 | $168,587 |
| 15 | $6,000 | $12,383 | $100,000 | $86,971 | $186,971 |
| 16 | $6,000 | $13,712 | $106,000 | $100,683 | $206,683 |
| 17 | $6,000 | $15,137 | $112,000 | $115,820 | $227,820 |
| 18 | $6,000 | $16,665 | $118,000 | $132,486 | $250,486 |
| 19 | $6,000 | $18,304 | $124,000 | $150,790 | $274,790 |
| 20 | $6,000 | $20,061 | $130,000 | $170,851 | $300,851 |
| 21 | $6,000 | $21,945 | $136,000 | $192,796 | $328,796 |
| 22 | $6,000 | $23,965 | $142,000 | $216,760 | $358,760 |
| 23 | $6,000 | $26,131 | $148,000 | $242,892 | $390,892 |
| 24 | $6,000 | $28,454 | $154,000 | $271,345 | $425,345 |
| 25 | $6,000 | $30,945 | $160,000 | $302,290 | $462,290 |
| 26 | $6,000 | $33,615 | $166,000 | $335,905 | $501,905 |
| 27 | $6,000 | $36,479 | $172,000 | $372,384 | $544,384 |
| 28 | $6,000 | $39,550 | $178,000 | $411,934 | $589,934 |
| 29 | $6,000 | $42,843 | $184,000 | $454,777 | $638,777 |
| 30 | $6,000 | $46,374 | $190,000 | $501,150 | $691,150 |
Compound interest calculator by Points Frog ↗ · An educational estimate, not financial advice.