Question 1

What does $500 grow to at 5% for 15 years?

Accepted Answer

$500 invested at 5% annual compound interest for 15 years grows to $1,039. Your original investment earns $539 in interest — a 107.9% total return and a 2.08× multiplier on your money.

Question 2

How long does it take to double money at 5%?

Accepted Answer

At 5% annual compound interest, your money doubles approximately every 14.4 years (the Rule of 72: 72 ÷ 5 = 14.4). Over 15 years, $500 has the potential to double 1.0 times.

Question 3

Is 5% a realistic return?

Accepted Answer

5% is a conservative assumption achievable through high-interest savings accounts or term deposits. It's a realistic baseline for low-risk investments, though actual rates vary with market conditions.

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 5% 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 5% return and 2.5% inflation, your real return is approximately 2.5% p.a. In real terms, $1,039 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$525	+$25
Yr 2	$551	+$26
Yr 3	$579	+$28
Yr 4	$608	+$29
Yr 5	$638	+$30
Yr 6	$670	+$32
Yr 7	$704	+$34
Yr 8	$739	+$35
Yr 9	$776	+$37
Yr 10	$814	+$39
Yr 11	$855	+$41
Yr 12	$898	+$43
Yr 13	$943	+$45
Yr 14	$990	+$47
Yr 15	$1,039	+$49

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	$525	+$25	$25	1.05×
Year 2	$551	+$26	$51	1.10×
Year 3	$579	+$28	$79	1.16×
Year 4	$608	+$29	$108	1.22×
Year 5	$638	+$30	$138	1.28×
Year 6	$670	+$32	$170	1.34×
Year 7	$704	+$34	$204	1.41×
Year 8	$739	+$35	$239	1.48×
Year 9	$776	+$37	$276	1.55×
Year 10	$814	+$39	$314	1.63×
Year 11	$855	+$41	$355	1.71×
Year 12	$898	+$43	$398	1.80×
Year 13	$943	+$45	$443	1.89×
Year 14	$990	+$47	$490	1.98×
Year 15	$1,039	+$49	$539	2.08×

Year	Balance	Interest
Yr 1	$525	+$25
Yr 2	$551	+$26
Yr 3	$579	+$28
Yr 4	$608	+$29
Yr 5	$638	+$30
Yr 6	$670	+$32
Yr 7	$704	+$34
Yr 8	$739	+$35
Yr 9	$776	+$37
Yr 10	$814	+$39
Yr 11	$855	+$41
Yr 12	$898	+$43
Yr 13	$943	+$45
Yr 14	$990	+$47
Yr 15	$1,039	+$49

$500 at 5% for 15 Years

How $500 grows at 5%

Year-by-year projection

Growth chart

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