Question 1

What does $10,000 grow to at 8% for 15 years?

Accepted Answer

$10,000 invested at 8% annual compound interest for 15 years grows to $31,722. Your original investment earns $21,722 in interest — a 217.2% total return and a 3.17× 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 15 years, $10,000 has the potential to double 1.7 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 $10,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $10,000 at 8% 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 8% return and 2.5% inflation, your real return is approximately 5.5% p.a. In real terms, $31,722 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$10,800	+$800
Yr 2	$11,664	+$864
Yr 3	$12,597	+$933
Yr 4	$13,605	+$1,008
Yr 5	$14,693	+$1,088
Yr 6	$15,869	+$1,175
Yr 7	$17,138	+$1,269
Yr 8	$18,509	+$1,371
Yr 9	$19,990	+$1,481
Yr 10	$21,589	+$1,599
Yr 11	$23,316	+$1,727
Yr 12	$25,182	+$1,865
Yr 13	$27,196	+$2,015
Yr 14	$29,372	+$2,176
Yr 15	$31,722	+$2,350

Rate	Final balance	Interest earned	Multiplier
4%	$18,009	$8,009	1.80×
5%	$20,789	$10,789	2.08×
6%	$23,966	$13,966	2.40×
7%	$27,590	$17,590	2.76×
8% ◀	$31,722	$21,722	3.17×
9%	$36,425	$26,425	3.64×
10%	$41,772	$31,772	4.18×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$10,800	+$800	$800	1.08×
Year 2	$11,664	+$864	$1,664	1.17×
Year 3	$12,597	+$933	$2,597	1.26×
Year 4	$13,605	+$1,008	$3,605	1.36×
Year 5	$14,693	+$1,088	$4,693	1.47×
Year 6	$15,869	+$1,175	$5,869	1.59×
Year 7	$17,138	+$1,269	$7,138	1.71×
Year 8	$18,509	+$1,371	$8,509	1.85×
Year 9	$19,990	+$1,481	$9,990	2.00×
Year 10	$21,589	+$1,599	$11,589	2.16×
Year 11	$23,316	+$1,727	$13,316	2.33×
Year 12	$25,182	+$1,865	$15,182	2.52×
Year 13	$27,196	+$2,015	$17,196	2.72×
Year 14	$29,372	+$2,176	$19,372	2.94×
Year 15	$31,722	+$2,350	$21,722	3.17×

Year	Balance	Interest
Yr 1	$10,800	+$800
Yr 2	$11,664	+$864
Yr 3	$12,597	+$933
Yr 4	$13,605	+$1,008
Yr 5	$14,693	+$1,088
Yr 6	$15,869	+$1,175
Yr 7	$17,138	+$1,269
Yr 8	$18,509	+$1,371
Yr 9	$19,990	+$1,481
Yr 10	$21,589	+$1,599
Yr 11	$23,316	+$1,727
Yr 12	$25,182	+$1,865
Yr 13	$27,196	+$2,015
Yr 14	$29,372	+$2,176
Yr 15	$31,722	+$2,350

$10,000 at 8% for 15 Years

How $10,000 grows at 8%

Year-by-year projection

Growth chart

Frequently asked questions

Explore other scenarios

Related calculators