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Compound interest calculator

See how a starting balance and regular contributions grow over time.

$

 

$

Added at the end of every month.

%

The nominal yearly rate, compounded monthly.

years

 

Future value

$300,850.72

Total contributed
$130,000.00
Interest earned
$170,850.72
Interest share of the final balance
56.79%

Year-by-year growth

YearContributedInterestBalance
1$16,000.00$919.19$16,919.19
2$22,000.00$2,338.58$24,338.58
3$28,000.00$4,294.31$32,294.31
4$34,000.00$6,825.16$40,825.16
5$40,000.00$9,972.70$49,972.70
6$46,000.00$13,781.53$59,781.53
7$52,000.00$18,299.43$70,299.43
8$58,000.00$23,577.68$81,577.68
9$64,000.00$29,671.22$93,671.22
10$70,000.00$36,639.02$106,639.02
11$76,000.00$44,544.25$120,544.25
12$82,000.00$53,454.70$135,454.70
13$88,000.00$63,443.02$151,443.02
14$94,000.00$74,587.14$168,587.14
15$100,000.00$86,970.62$186,970.62
16$106,000.00$100,683.03$206,683.03
17$112,000.00$115,820.45$227,820.45
18$118,000.00$132,485.91$250,485.91
19$124,000.00$150,789.85$274,789.85
20$130,000.00$170,850.72$300,850.72

How this is calculated

Each month the balance earns interest at one-twelfth of the annual rate, then the monthly contribution is added.

Future value = P × (1 + r/12)^n + C × ((1 + r/12)^n − 1) ÷ (r/12), where P is the starting balance, C the monthly contribution, r the annual rate and n the number of months.

Results are before tax and fees, and assume a constant rate. Real returns vary year to year.

These calculators are for general information and education. They use the assumptions described on each page and are not personalised financial, tax or investment advice.

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