Question 1

What does $500 grow to at 7% for 15 years?

Accepted Answer

$500 invested at 7% annual compound interest for 15 years grows to $1,380. Your original investment earns $880 in interest — a 175.9% total return and a 2.76× multiplier on your money.

Question 2

How long does it take to double money at 7%?

Accepted Answer

At 7% annual compound interest, your money doubles approximately every 10.3 years (the Rule of 72: 72 ÷ 7 = 10.3). Over 15 years, $500 has the potential to double 1.5 times.

Question 3

Is 7% a realistic return?

Accepted Answer

7% 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 7% 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 7% 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 7% return and 2.5% inflation, your real return is approximately 4.5% p.a. In real terms, $1,380 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$535	+$35
Yr 2	$572	+$37
Yr 3	$613	+$40
Yr 4	$655	+$43
Yr 5	$701	+$46
Yr 6	$750	+$49
Yr 7	$803	+$53
Yr 8	$859	+$56
Yr 9	$919	+$60
Yr 10	$984	+$64
Yr 11	$1,052	+$69
Yr 12	$1,126	+$74
Yr 13	$1,205	+$79
Yr 14	$1,289	+$84
Yr 15	$1,380	+$90

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	$535	+$35	$35	1.07×
Year 2	$572	+$37	$72	1.14×
Year 3	$613	+$40	$113	1.23×
Year 4	$655	+$43	$155	1.31×
Year 5	$701	+$46	$201	1.40×
Year 6	$750	+$49	$250	1.50×
Year 7	$803	+$53	$303	1.61×
Year 8	$859	+$56	$359	1.72×
Year 9	$919	+$60	$419	1.84×
Year 10	$984	+$64	$484	1.97×
Year 11	$1,052	+$69	$552	2.10×
Year 12	$1,126	+$74	$626	2.25×
Year 13	$1,205	+$79	$705	2.41×
Year 14	$1,289	+$84	$789	2.58×
Year 15	$1,380	+$90	$880	2.76×

Year	Balance	Interest
Yr 1	$535	+$35
Yr 2	$572	+$37
Yr 3	$613	+$40
Yr 4	$655	+$43
Yr 5	$701	+$46
Yr 6	$750	+$49
Yr 7	$803	+$53
Yr 8	$859	+$56
Yr 9	$919	+$60
Yr 10	$984	+$64
Yr 11	$1,052	+$69
Yr 12	$1,126	+$74
Yr 13	$1,205	+$79
Yr 14	$1,289	+$84
Yr 15	$1,380	+$90

$500 at 7% for 15 Years

How $500 grows at 7%

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