📈 Compound Interest
$100,000 at 9% for 20 Years
Investing $100,000 at 9% annual compound interest for 20 years grows to $560,441. That's $460,441 earned in interest on top of your original $100,000.
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 20 years
$560,441
Amount invested$100,000
Interest earned$460,441
Interest multiplier5.60×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $109,000 | +$9,000 |
| Yr 2 | $118,810 | +$9,810 |
| Yr 3 | $129,503 | +$10,693 |
| Yr 4 | $141,158 | +$11,655 |
| Yr 5 | $153,862 | +$12,704 |
| Yr 6 | $167,710 | +$13,848 |
| Yr 7 | $182,804 | +$15,094 |
| Yr 8 | $199,256 | +$16,452 |
| Yr 9 | $217,189 | +$17,933 |
| Yr 10 | $236,736 | +$19,547 |
| Yr 11 | $258,043 | +$21,306 |
| Yr 12 | $281,266 | +$23,224 |
| Yr 13 | $306,580 | +$25,314 |
| Yr 14 | $334,173 | +$27,592 |
| Yr 15 | $364,248 | +$30,076 |
| Yr 16 | $397,031 | +$32,782 |
| Yr 17 | $432,763 | +$35,733 |
| Yr 18 | $471,712 | +$38,949 |
| Yr 19 | $514,166 | +$42,454 |
| Yr 20 | $560,441 | +$46,275 |
Final balance after 20 years
$560,441
Invested
$100,000
Interest earned
$460,441
Multiplier
5.60×
How $100,000 grows at 9%
Compound interest earns returns on your returns — not just your original investment. At 9% per year, your money doubles every 8 years (the Rule of 72). Over 20 years, that compounds to a 5.60× multiplier.
In year 1, $100,000 earns $9,000 in interest. By year 20, the annual interest has grown to $46,275 — because each year's interest is calculated on a larger balance.
Year-by-year projection
| Year | Balance | Interest this year | Total interest | Growth |
|---|---|---|---|---|
| Year 1 | $109,000 | +$9,000 | $9,000 | 1.09× |
| Year 2 | $118,810 | +$9,810 | $18,810 | 1.19× |
| Year 3 | $129,503 | +$10,693 | $29,503 | 1.30× |
| Year 4 | $141,158 | +$11,655 | $41,158 | 1.41× |
| Year 5 | $153,862 | +$12,704 | $53,862 | 1.54× |
| Year 6 | $167,710 | +$13,848 | $67,710 | 1.68× |
| Year 7 | $182,804 | +$15,094 | $82,804 | 1.83× |
| Year 8 | $199,256 | +$16,452 | $99,256 | 1.99× |
| Year 9 | $217,189 | +$17,933 | $117,189 | 2.17× |
| Year 10 | $236,736 | +$19,547 | $136,736 | 2.37× |
| Year 11 | $258,043 | +$21,306 | $158,043 | 2.58× |
| Year 12 | $281,266 | +$23,224 | $181,266 | 2.81× |
| Year 13 | $306,580 | +$25,314 | $206,580 | 3.07× |
| Year 14 | $334,173 | +$27,592 | $234,173 | 3.34× |
| Year 15 | $364,248 | +$30,076 | $264,248 | 3.64× |
| Year 16 | $397,031 | +$32,782 | $297,031 | 3.97× |
| Year 17 | $432,763 | +$35,733 | $332,763 | 4.33× |
| Year 18 | $471,712 | +$38,949 | $371,712 | 4.72× |
| Year 19 | $514,166 | +$42,454 | $414,166 | 5.14× |
| Year 20 | $560,441 | +$46,275 | $460,441 | 5.60× |
Growth chart
Balance growth over 20 years
Principal
Interest earned
Frequently asked questions
Explore other scenarios
$100,000 for 20 years — other rates
$100,000 at 9% — other time horizons
Related calculators
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 20 years
$560,441
Amount invested$100,000
Interest earned$460,441
Interest multiplier5.60×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $109,000 | +$9,000 |
| Yr 2 | $118,810 | +$9,810 |
| Yr 3 | $129,503 | +$10,693 |
| Yr 4 | $141,158 | +$11,655 |
| Yr 5 | $153,862 | +$12,704 |
| Yr 6 | $167,710 | +$13,848 |
| Yr 7 | $182,804 | +$15,094 |
| Yr 8 | $199,256 | +$16,452 |
| Yr 9 | $217,189 | +$17,933 |
| Yr 10 | $236,736 | +$19,547 |
| Yr 11 | $258,043 | +$21,306 |
| Yr 12 | $281,266 | +$23,224 |
| Yr 13 | $306,580 | +$25,314 |
| Yr 14 | $334,173 | +$27,592 |
| Yr 15 | $364,248 | +$30,076 |
| Yr 16 | $397,031 | +$32,782 |
| Yr 17 | $432,763 | +$35,733 |
| Yr 18 | $471,712 | +$38,949 |
| Yr 19 | $514,166 | +$42,454 |
| Yr 20 | $560,441 | +$46,275 |