Question 1

What does $500 grow to at 8% for 25 years?

Accepted Answer

$500 invested at 8% annual compound interest for 25 years grows to $3,424. Your original investment earns $2,924 in interest — a 584.8% total return and a 6.85× multiplier on your money.

Question 2

How long does it take to double money at 8%?

Accepted Answer

At 8% annual compound interest, your money doubles approximately every 9 years (the Rule of 72: 72 ÷ 8 = 9). Over 25 years, $500 has the potential to double 2.8 times.

Question 3

Is 8% a realistic return?

Accepted Answer

8% is a moderate return that aligns with long-term historical averages for diversified share portfolios. The ASX 200 has returned around 9–10% p.a. including dividends historically, so 8% is realistic over long periods after accounting for fees and portfolio mix.

Question 4

What's the effect of adding regular contributions?

Accepted Answer

These figures show a one-time lump sum of $500 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $500 at 8% for 25 years would result in a significantly larger final balance. Use the interactive calculator above to model your own contribution amount.

Question 5

How does inflation affect this result?

Accepted Answer

This calculator shows nominal returns — the dollar figures before adjusting for inflation. Australia's historical inflation rate is around 2–3% per year. To estimate real purchasing power, subtract the inflation rate from your return: at 8% return and 2.5% inflation, your real return is approximately 5.5% p.a. In real terms, $3,424 in 25 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$540	+$40
Yr 2	$583	+$43
Yr 3	$630	+$47
Yr 4	$680	+$50
Yr 5	$735	+$54
Yr 6	$793	+$59
Yr 7	$857	+$63
Yr 8	$925	+$69
Yr 9	$1,000	+$74
Yr 10	$1,079	+$80
Yr 11	$1,166	+$86
Yr 12	$1,259	+$93
Yr 13	$1,360	+$101
Yr 14	$1,469	+$109
Yr 15	$1,586	+$117
Yr 16	$1,713	+$127
Yr 17	$1,850	+$137
Yr 18	$1,998	+$148
Yr 19	$2,158	+$160
Yr 20	$2,330	+$173
Yr 21	$2,517	+$186
Yr 22	$2,718	+$201
Yr 23	$2,936	+$217
Yr 24	$3,171	+$235
Yr 25	$3,424	+$254

Rate	Final balance	Interest earned	Multiplier
4%	$1,333	$833	2.67×
5%	$1,693	$1,193	3.39×
6%	$2,146	$1,646	4.29×
7%	$2,714	$2,214	5.43×
8% ◀	$3,424	$2,924	6.85×
9%	$4,312	$3,812	8.62×
10%	$5,417	$4,917	10.83×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$540	+$40	$40	1.08×
Year 2	$583	+$43	$83	1.17×
Year 3	$630	+$47	$130	1.26×
Year 4	$680	+$50	$180	1.36×
Year 5	$735	+$54	$235	1.47×
Year 6	$793	+$59	$293	1.59×
Year 7	$857	+$63	$357	1.71×
Year 8	$925	+$69	$425	1.85×
Year 9	$1,000	+$74	$500	2.00×
Year 10	$1,079	+$80	$579	2.16×
Year 11	$1,166	+$86	$666	2.33×
Year 12	$1,259	+$93	$759	2.52×
Year 13	$1,360	+$101	$860	2.72×
Year 14	$1,469	+$109	$969	2.94×
Year 15	$1,586	+$117	$1,086	3.17×
Year 16	$1,713	+$127	$1,213	3.43×
Year 17	$1,850	+$137	$1,350	3.70×
Year 18	$1,998	+$148	$1,498	4.00×
Year 19	$2,158	+$160	$1,658	4.32×
Year 20	$2,330	+$173	$1,830	4.66×
Year 21	$2,517	+$186	$2,017	5.03×
Year 22	$2,718	+$201	$2,218	5.44×
Year 23	$2,936	+$217	$2,436	5.87×
Year 24	$3,171	+$235	$2,671	6.34×
Year 25	$3,424	+$254	$2,924	6.85×

Year	Balance	Interest
Yr 1	$540	+$40
Yr 2	$583	+$43
Yr 3	$630	+$47
Yr 4	$680	+$50
Yr 5	$735	+$54
Yr 6	$793	+$59
Yr 7	$857	+$63
Yr 8	$925	+$69
Yr 9	$1,000	+$74
Yr 10	$1,079	+$80
Yr 11	$1,166	+$86
Yr 12	$1,259	+$93
Yr 13	$1,360	+$101
Yr 14	$1,469	+$109
Yr 15	$1,586	+$117
Yr 16	$1,713	+$127
Yr 17	$1,850	+$137
Yr 18	$1,998	+$148
Yr 19	$2,158	+$160
Yr 20	$2,330	+$173
Yr 21	$2,517	+$186
Yr 22	$2,718	+$201
Yr 23	$2,936	+$217
Yr 24	$3,171	+$235
Yr 25	$3,424	+$254

$500 at 8% for 25 Years

How $500 grows at 8%

Year-by-year projection

Growth chart

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