Question 1

What does $1,000 grow to at 8% for 15 years?

Accepted Answer

$1,000 invested at 8% annual compound interest for 15 years grows to $3,172. Your original investment earns $2,172 in interest — a 217.2% total return and a 3.17× 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 15 years, $1,000 has the potential to double 1.7 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 $1,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $1,000 at 8% for 15 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, $3,172 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$1,080	+$80
Yr 2	$1,166	+$86
Yr 3	$1,260	+$93
Yr 4	$1,360	+$101
Yr 5	$1,469	+$109
Yr 6	$1,587	+$118
Yr 7	$1,714	+$127
Yr 8	$1,851	+$137
Yr 9	$1,999	+$148
Yr 10	$2,159	+$160
Yr 11	$2,332	+$173
Yr 12	$2,518	+$187
Yr 13	$2,720	+$201
Yr 14	$2,937	+$218
Yr 15	$3,172	+$235

Rate	Final balance	Interest earned	Multiplier
4%	$1,801	$801	1.80×
5%	$2,079	$1,079	2.08×
6%	$2,397	$1,397	2.40×
7%	$2,759	$1,759	2.76×
8% ◀	$3,172	$2,172	3.17×
9%	$3,642	$2,642	3.64×
10%	$4,177	$3,177	4.18×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$1,080	+$80	$80	1.08×
Year 2	$1,166	+$86	$166	1.17×
Year 3	$1,260	+$93	$260	1.26×
Year 4	$1,360	+$101	$360	1.36×
Year 5	$1,469	+$109	$469	1.47×
Year 6	$1,587	+$118	$587	1.59×
Year 7	$1,714	+$127	$714	1.71×
Year 8	$1,851	+$137	$851	1.85×
Year 9	$1,999	+$148	$999	2.00×
Year 10	$2,159	+$160	$1,159	2.16×
Year 11	$2,332	+$173	$1,332	2.33×
Year 12	$2,518	+$187	$1,518	2.52×
Year 13	$2,720	+$201	$1,720	2.72×
Year 14	$2,937	+$218	$1,937	2.94×
Year 15	$3,172	+$235	$2,172	3.17×

Year	Balance	Interest
Yr 1	$1,080	+$80
Yr 2	$1,166	+$86
Yr 3	$1,260	+$93
Yr 4	$1,360	+$101
Yr 5	$1,469	+$109
Yr 6	$1,587	+$118
Yr 7	$1,714	+$127
Yr 8	$1,851	+$137
Yr 9	$1,999	+$148
Yr 10	$2,159	+$160
Yr 11	$2,332	+$173
Yr 12	$2,518	+$187
Yr 13	$2,720	+$201
Yr 14	$2,937	+$218
Yr 15	$3,172	+$235

$1,000 at 8% for 15 Years

How $1,000 grows at 8%

Year-by-year projection

Growth chart

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