📈 Compound Interest

$5,000 at 7% for 30 Years

Investing $5,000 at 7% annual compound interest for 30 years grows to $38,061. That's $33,061 earned in interest on top of your original $5,000.

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
$38,061
Amount invested$5,000
Interest earned$33,061
Interest multiplier7.61×
Year-by-year growth
YearBalanceInterest
Yr 1$5,350+$350
Yr 2$5,725+$375
Yr 3$6,125+$401
Yr 4$6,554+$429
Yr 5$7,013+$459
Yr 6$7,504+$491
Yr 7$8,029+$525
Yr 8$8,591+$562
Yr 9$9,192+$601
Yr 10$9,836+$643
Yr 11$10,524+$689
Yr 12$11,261+$737
Yr 13$12,049+$788
Yr 14$12,893+$843
Yr 15$13,795+$902
Yr 16$14,761+$966
Yr 17$15,794+$1,033
Yr 18$16,900+$1,106
Yr 19$18,083+$1,183
Yr 20$19,348+$1,266
Yr 21$20,703+$1,354
Yr 22$22,152+$1,449
Yr 23$23,703+$1,551
Yr 24$25,362+$1,659
Yr 25$27,137+$1,775
Yr 26$29,037+$1,900
Yr 27$31,069+$2,033
Yr 28$33,244+$2,175
Yr 29$35,571+$2,327
Yr 30$38,061+$2,490
Final balance after 30 years
$38,061
Invested
$5,000
Interest earned
$33,061
Multiplier
7.61×

How $5,000 grows at 7%

Compound interest earns returns on your returns — not just your original investment. At 7% per year, your money doubles every 10.3 years (the Rule of 72). Over 30 years, that compounds to a 7.61× multiplier.

In year 1, $5,000 earns $350 in interest. By year 30, the annual interest has grown to $2,490 — 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.

$5,000 for 30 years at different rates
RateFinal balanceInterest earnedMultiplier
4%$16,217$11,2173.24×
5%$21,610$16,6104.32×
6%$28,717$23,7175.74×
7% ◀$38,061$33,0617.61×
8%$50,313$45,31310.06×
9%$66,338$61,33813.27×
10%$87,247$82,24717.45×

Year-by-year projection

YearBalanceInterest this yearTotal interestGrowth
Year 1$5,350+$350$3501.07×
Year 2$5,725+$375$7251.14×
Year 3$6,125+$401$1,1251.23×
Year 4$6,554+$429$1,5541.31×
Year 5$7,013+$459$2,0131.40×
Year 6$7,504+$491$2,5041.50×
Year 7$8,029+$525$3,0291.61×
Year 8$8,591+$562$3,5911.72×
Year 9$9,192+$601$4,1921.84×
Year 10$9,836+$643$4,8361.97×
Year 11$10,524+$689$5,5242.10×
Year 12$11,261+$737$6,2612.25×
Year 13$12,049+$788$7,0492.41×
Year 14$12,893+$843$7,8932.58×
Year 15$13,795+$902$8,7952.76×
Year 16$14,761+$966$9,7612.95×
Year 17$15,794+$1,033$10,7943.16×
Year 18$16,900+$1,106$11,9003.38×
Year 19$18,083+$1,183$13,0833.62×
Year 20$19,348+$1,266$14,3483.87×
Year 21$20,703+$1,354$15,7034.14×
Year 22$22,152+$1,449$17,1524.43×
Year 23$23,703+$1,551$18,7034.74×
Year 24$25,362+$1,659$20,3625.07×
Year 25$27,137+$1,775$22,1375.43×
Year 26$29,037+$1,900$24,0375.81×
Year 27$31,069+$2,033$26,0696.21×
Year 28$33,244+$2,175$28,2446.65×
Year 29$35,571+$2,327$30,5717.11×
Year 30$38,061+$2,490$33,0617.61×

Growth chart

Balance growth over 30 years
$10k$19k$29k$38kYr1Yr5Yr10Yr15Yr20Yr25Yr30
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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