📈 Compound Interest

$2,000 at 9% for 30 Years

Investing $2,000 at 9% annual compound interest for 30 years grows to $26,535. That's $24,535 earned in interest on top of your original $2,000.

If you want to adjust the return assumption, extend the timeframe, or add regular contributions, use the compound interest calculator.

If you want the plain-English explanation behind the numbers, read our guide to compound interest.

Compound Interest Calculator
Australia 2026
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%
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Total value after 30 years
$26,535
Amount invested$2,000
Interest earned$24,535
Interest multiplier13.27×
Year-by-year growth
YearBalanceInterest
Yr 1$2,180+$180
Yr 2$2,376+$196
Yr 3$2,590+$214
Yr 4$2,823+$233
Yr 5$3,077+$254
Yr 6$3,354+$277
Yr 7$3,656+$302
Yr 8$3,985+$329
Yr 9$4,344+$359
Yr 10$4,735+$391
Yr 11$5,161+$426
Yr 12$5,625+$464
Yr 13$6,132+$506
Yr 14$6,683+$552
Yr 15$7,285+$602
Yr 16$7,941+$656
Yr 17$8,655+$715
Yr 18$9,434+$779
Yr 19$10,283+$849
Yr 20$11,209+$925
Yr 21$12,218+$1,009
Yr 22$13,317+$1,100
Yr 23$14,516+$1,199
Yr 24$15,822+$1,306
Yr 25$17,246+$1,424
Yr 26$18,798+$1,552
Yr 27$20,490+$1,692
Yr 28$22,334+$1,844
Yr 29$24,344+$2,010
Yr 30$26,535+$2,191
Final balance after 30 years
$26,535
Invested
$2,000
Interest earned
$24,535
Multiplier
13.27×

How $2,000 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 30 years, that compounds to a 13.27× multiplier.

In year 1, $2,000 earns $180 in interest. By year 30, the annual interest has grown to $2,191 — because each year's interest is calculated on a larger balance.

This is why longer holding periods matter so much. The later years do more of the heavy lifting, especially once the balance is large enough to generate bigger dollar returns each year.

$2,000 for 30 years at different rates
RateFinal balanceInterest earnedMultiplier
4%$6,487$4,4873.24×
5%$8,644$6,6444.32×
6%$11,487$9,4875.74×
7%$15,225$13,2257.61×
8%$20,125$18,12510.06×
9% ◀$26,535$24,53513.27×
10%$34,899$32,89917.45×

Year-by-year projection

YearBalanceInterest this yearTotal interestGrowth
Year 1$2,180+$180$1801.09×
Year 2$2,376+$196$3761.19×
Year 3$2,590+$214$5901.30×
Year 4$2,823+$233$8231.41×
Year 5$3,077+$254$1,0771.54×
Year 6$3,354+$277$1,3541.68×
Year 7$3,656+$302$1,6561.83×
Year 8$3,985+$329$1,9851.99×
Year 9$4,344+$359$2,3442.17×
Year 10$4,735+$391$2,7352.37×
Year 11$5,161+$426$3,1612.58×
Year 12$5,625+$464$3,6252.81×
Year 13$6,132+$506$4,1323.07×
Year 14$6,683+$552$4,6833.34×
Year 15$7,285+$602$5,2853.64×
Year 16$7,941+$656$5,9413.97×
Year 17$8,655+$715$6,6554.33×
Year 18$9,434+$779$7,4344.72×
Year 19$10,283+$849$8,2835.14×
Year 20$11,209+$925$9,2095.60×
Year 21$12,218+$1,009$10,2186.11×
Year 22$13,317+$1,100$11,3176.66×
Year 23$14,516+$1,199$12,5167.26×
Year 24$15,822+$1,306$13,8227.91×
Year 25$17,246+$1,424$15,2468.62×
Year 26$18,798+$1,552$16,7989.40×
Year 27$20,490+$1,692$18,49010.25×
Year 28$22,334+$1,844$20,33411.17×
Year 29$24,344+$2,010$22,34412.17×
Year 30$26,535+$2,191$24,53513.27×

Growth chart

Balance growth over 30 years
$7k$13k$20k$27kYr1Yr5Yr10Yr15Yr20Yr25Yr30
Principal
Interest earned

Frequently asked questions

Related compound interest scenarios

Use these nearby examples to compare what changes when you keep the same starting balance, extend the investing period, or test a more aggressive return assumption.

Compound interest guide and tools

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