📈 Compound Interest

$10,000 at 8% for 20 Years

Investing $10,000 at 8% annual compound interest for 20 years grows to $46,610. That's $36,610 earned in interest on top of your original $10,000.

Compound Interest Calculator
Australia 2026
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%
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Total value after 20 years
$46,610
Amount invested$10,000
Interest earned$36,610
Interest multiplier4.66×
Year-by-year growth
YearBalanceInterest
Yr 1$10,800+$800
Yr 2$11,664+$864
Yr 3$12,597+$933
Yr 4$13,605+$1,008
Yr 5$14,693+$1,088
Yr 6$15,869+$1,175
Yr 7$17,138+$1,269
Yr 8$18,509+$1,371
Yr 9$19,990+$1,481
Yr 10$21,589+$1,599
Yr 11$23,316+$1,727
Yr 12$25,182+$1,865
Yr 13$27,196+$2,015
Yr 14$29,372+$2,176
Yr 15$31,722+$2,350
Yr 16$34,259+$2,538
Yr 17$37,000+$2,741
Yr 18$39,960+$2,960
Yr 19$43,157+$3,197
Yr 20$46,610+$3,453
Final balance after 20 years
$46,610
Invested
$10,000
Interest earned
$36,610
Multiplier
4.66×

How $10,000 grows at 8%

Compound interest earns returns on your returns — not just your original investment. At 8% per year, your money doubles every 9 years (the Rule of 72). Over 20 years, that compounds to a 4.66× multiplier.

In year 1, $10,000 earns $800 in interest. By year 20, the annual interest has grown to $3,453 — because each year's interest is calculated on a larger balance.

$10,000 for 20 years at different rates
RateFinal balanceInterest earnedMultiplier
4%$21,911$11,9112.19×
5%$26,533$16,5332.65×
6%$32,071$22,0713.21×
7%$38,697$28,6973.87×
8% ◀$46,610$36,6104.66×
9%$56,044$46,0445.60×
10%$67,275$57,2756.73×

Year-by-year projection

YearBalanceInterest this yearTotal interestGrowth
Year 1$10,800+$800$8001.08×
Year 2$11,664+$864$1,6641.17×
Year 3$12,597+$933$2,5971.26×
Year 4$13,605+$1,008$3,6051.36×
Year 5$14,693+$1,088$4,6931.47×
Year 6$15,869+$1,175$5,8691.59×
Year 7$17,138+$1,269$7,1381.71×
Year 8$18,509+$1,371$8,5091.85×
Year 9$19,990+$1,481$9,9902.00×
Year 10$21,589+$1,599$11,5892.16×
Year 11$23,316+$1,727$13,3162.33×
Year 12$25,182+$1,865$15,1822.52×
Year 13$27,196+$2,015$17,1962.72×
Year 14$29,372+$2,176$19,3722.94×
Year 15$31,722+$2,350$21,7223.17×
Year 16$34,259+$2,538$24,2593.43×
Year 17$37,000+$2,741$27,0003.70×
Year 18$39,960+$2,960$29,9604.00×
Year 19$43,157+$3,197$33,1574.32×
Year 20$46,610+$3,453$36,6104.66×

Growth chart

Balance growth over 20 years
$12k$23k$35k$47kYr1Yr5Yr10Yr15Yr20
Principal
Interest earned

Frequently asked questions

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