Question 1

What does $500 grow to at 10% for 5 years?

Accepted Answer

$500 invested at 10% annual compound interest for 5 years grows to $805. Your original investment earns $305 in interest — a 61.1% total return and a 1.61× multiplier on your money.

Question 2

How long does it take to double money at 10%?

Accepted Answer

At 10% annual compound interest, your money doubles approximately every 7.2 years (the Rule of 72: 72 ÷ 10 = 7.2). Over 5 years, $500 has the potential to double 0.7 times.

Question 3

Is 10% a realistic return?

Accepted Answer

10% 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 10% 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 10% 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 10% return and 2.5% inflation, your real return is approximately 7.5% p.a. In real terms, $805 in 5 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$550	+$50
Yr 2	$605	+$55
Yr 3	$666	+$61
Yr 4	$732	+$67
Yr 5	$805	+$73

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	$550	+$50	$50	1.10×
Year 2	$605	+$55	$105	1.21×
Year 3	$666	+$61	$166	1.33×
Year 4	$732	+$67	$232	1.46×
Year 5	$805	+$73	$305	1.61×

Year	Balance	Interest
Yr 1	$550	+$50
Yr 2	$605	+$55
Yr 3	$666	+$61
Yr 4	$732	+$67
Yr 5	$805	+$73

$500 at 10% for 5 Years

How $500 grows at 10%

Year-by-year projection

Growth chart

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