Question 1

What does $500 grow to at 9% for 15 years?

Accepted Answer

$500 invested at 9% annual compound interest for 15 years grows to $1,821. Your original investment earns $1,321 in interest — a 264.2% total return and a 3.64× multiplier on your money.

Question 2

How long does it take to double money at 9%?

Accepted Answer

At 9% annual compound interest, your money doubles approximately every 8 years (the Rule of 72: 72 ÷ 9 = 8). Over 15 years, $500 has the potential to double 1.9 times.

Question 3

Is 9% a realistic return?

Accepted Answer

9% is an optimistic but achievable return for growth-oriented share portfolios over long time horizons. The ASX 200 has averaged around 9–10% p.a. including dividends. A 9% assumption requires patience and comfort with short-term market volatility.

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 9% 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 9% return and 2.5% inflation, your real return is approximately 6.5% p.a. In real terms, $1,821 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$545	+$45
Yr 2	$594	+$49
Yr 3	$648	+$53
Yr 4	$706	+$58
Yr 5	$769	+$64
Yr 6	$839	+$69
Yr 7	$914	+$75
Yr 8	$996	+$82
Yr 9	$1,086	+$90
Yr 10	$1,184	+$98
Yr 11	$1,290	+$107
Yr 12	$1,406	+$116
Yr 13	$1,533	+$127
Yr 14	$1,671	+$138
Yr 15	$1,821	+$150

Rate	Final balance	Interest earned	Multiplier
4%	$900	$400	1.80×
5%	$1,039	$539	2.08×
6%	$1,198	$698	2.40×
7%	$1,380	$880	2.76×
8%	$1,586	$1,086	3.17×
9% ◀	$1,821	$1,321	3.64×
10%	$2,089	$1,589	4.18×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$545	+$45	$45	1.09×
Year 2	$594	+$49	$94	1.19×
Year 3	$648	+$53	$148	1.30×
Year 4	$706	+$58	$206	1.41×
Year 5	$769	+$64	$269	1.54×
Year 6	$839	+$69	$339	1.68×
Year 7	$914	+$75	$414	1.83×
Year 8	$996	+$82	$496	1.99×
Year 9	$1,086	+$90	$586	2.17×
Year 10	$1,184	+$98	$684	2.37×
Year 11	$1,290	+$107	$790	2.58×
Year 12	$1,406	+$116	$906	2.81×
Year 13	$1,533	+$127	$1,033	3.07×
Year 14	$1,671	+$138	$1,171	3.34×
Year 15	$1,821	+$150	$1,321	3.64×

Year	Balance	Interest
Yr 1	$545	+$45
Yr 2	$594	+$49
Yr 3	$648	+$53
Yr 4	$706	+$58
Yr 5	$769	+$64
Yr 6	$839	+$69
Yr 7	$914	+$75
Yr 8	$996	+$82
Yr 9	$1,086	+$90
Yr 10	$1,184	+$98
Yr 11	$1,290	+$107
Yr 12	$1,406	+$116
Yr 13	$1,533	+$127
Yr 14	$1,671	+$138
Yr 15	$1,821	+$150

$500 at 9% for 15 Years

How $500 grows at 9%

Year-by-year projection

Growth chart

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