Question 1

What does $500 grow to at 8% for 5 years?

Accepted Answer

$500 invested at 8% annual compound interest for 5 years grows to $735. Your original investment earns $235 in interest — a 46.9% total return and a 1.47× 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 5 years, $500 has the potential to double 0.6 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 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 8% return and 2.5% inflation, your real return is approximately 5.5% p.a. In real terms, $735 in 5 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

Rate	Final balance	Interest earned	Multiplier
4%	$608	$108	1.22×
5%	$638	$138	1.28×
6%	$669	$169	1.34×
7%	$701	$201	1.40×
8% ◀	$735	$235	1.47×
9%	$769	$269	1.54×
10%	$805	$305	1.61×

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	Balance	Interest
Yr 1	$540	+$40
Yr 2	$583	+$43
Yr 3	$630	+$47
Yr 4	$680	+$50
Yr 5	$735	+$54

$500 at 8% for 5 Years

How $500 grows at 8%

Year-by-year projection

Growth chart

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