Question 1

What does $100,000 grow to at 9% for 5 years?

Accepted Answer

$100,000 invested at 9% annual compound interest for 5 years grows to $153,862. Your original investment earns $53,862 in interest — a 53.9% total return and a 1.54× 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 5 years, $100,000 has the potential to double 0.6 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 $100,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $100,000 at 9% for 5 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, $153,862 in 5 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$109,000	+$9,000
Yr 2	$118,810	+$9,810
Yr 3	$129,503	+$10,693
Yr 4	$141,158	+$11,655
Yr 5	$153,862	+$12,704

Rate	Final balance	Interest earned	Multiplier
4%	$121,665	$21,665	1.22×
5%	$127,628	$27,628	1.28×
6%	$133,823	$33,823	1.34×
7%	$140,255	$40,255	1.40×
8%	$146,933	$46,933	1.47×
9% ◀	$153,862	$53,862	1.54×
10%	$161,051	$61,051	1.61×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$109,000	+$9,000	$9,000	1.09×
Year 2	$118,810	+$9,810	$18,810	1.19×
Year 3	$129,503	+$10,693	$29,503	1.30×
Year 4	$141,158	+$11,655	$41,158	1.41×
Year 5	$153,862	+$12,704	$53,862	1.54×

Year	Balance	Interest
Yr 1	$109,000	+$9,000
Yr 2	$118,810	+$9,810
Yr 3	$129,503	+$10,693
Yr 4	$141,158	+$11,655
Yr 5	$153,862	+$12,704

$100,000 at 9% for 5 Years

How $100,000 grows at 9%

Year-by-year projection

Growth chart

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