Compound Interest

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Contributions are added at the end of each month; interest accrues on the running balance.
YearPaid in to dateInterest that yearInterest to dateClosing balance
1$13,000.00$821.05$821.05$13,821.05
2$16,000.00$1,097.27$1,918.32$17,918.32
3$19,000.00$1,393.46$3,311.78$22,311.78
4$22,000.00$1,711.07$5,022.85$27,022.85
5$25,000.00$2,051.63$7,074.48$32,074.48
6$28,000.00$2,416.81$9,491.29$37,491.29
7$31,000.00$2,808.39$12,299.69$43,299.69
8$34,000.00$3,228.28$15,527.97$49,527.97
9$37,000.00$3,678.53$19,206.50$56,206.50
10$40,000.00$4,161.32$23,367.82$63,367.82
11$43,000.00$4,679.01$28,046.83$71,046.83
12$46,000.00$5,234.13$33,280.95$79,280.95
13$49,000.00$5,829.37$39,110.33$88,110.33
14$52,000.00$6,467.65$45,577.98$97,577.98
15$55,000.00$7,152.07$52,730.04$107,730.04
16$58,000.00$7,885.96$60,616.00$118,616.00
17$61,000.00$8,672.91$69,288.91$130,288.91
18$64,000.00$9,516.74$78,805.65$142,805.65
19$67,000.00$10,421.58$89,227.23$156,227.23
20$70,000.00$11,391.83$100,619.05$170,619.05
How it works

Compound Interest Calculator with Monthly Contributions

See what a starting deposit plus a monthly contribution grows into, with any compounding frequency and a full year-by-year breakdown.

What this does
  • A starting deposit plus a recurring contribution, added at the end of every month
  • Compounding annually, semi-annually, quarterly, monthly or daily
  • Effective annual rate and money multiple shown next to the final balance
  • Year-by-year table of paid-in, interest that year, interest to date and closing balance
FAQ

Less than the option suggests. A nominal 7% compounded daily works out at an effective 7.250% a year, against a flat 7.000% compounded annually, the effective rate readout shows you the gap for your own figures. Over twenty years that is worth a few percent of the final balance. How much you contribute each month, and for how many years, move the answer far harder than the frequency does.

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