Question 1

What does $100,000 grow to at 8% for 10 years?

Accepted Answer

$100,000 invested at 8% annual compound interest for 10 years grows to $215,892. Your original investment earns $115,892 in interest — a 115.9% total return and a 2.16× 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 10 years, $100,000 has the potential to double 1.1 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 $100,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $100,000 at 8% for 10 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, $215,892 in 10 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$108,000	+$8,000
Yr 2	$116,640	+$8,640
Yr 3	$125,971	+$9,331
Yr 4	$136,049	+$10,078
Yr 5	$146,933	+$10,884
Yr 6	$158,687	+$11,755
Yr 7	$171,382	+$12,695
Yr 8	$185,093	+$13,711
Yr 9	$199,900	+$14,807
Yr 10	$215,892	+$15,992

Rate	Final balance	Interest earned	Multiplier
4%	$148,024	$48,024	1.48×
5%	$162,889	$62,889	1.63×
6%	$179,085	$79,085	1.79×
7%	$196,715	$96,715	1.97×
8% ◀	$215,892	$115,892	2.16×
9%	$236,736	$136,736	2.37×
10%	$259,374	$159,374	2.59×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$108,000	+$8,000	$8,000	1.08×
Year 2	$116,640	+$8,640	$16,640	1.17×
Year 3	$125,971	+$9,331	$25,971	1.26×
Year 4	$136,049	+$10,078	$36,049	1.36×
Year 5	$146,933	+$10,884	$46,933	1.47×
Year 6	$158,687	+$11,755	$58,687	1.59×
Year 7	$171,382	+$12,695	$71,382	1.71×
Year 8	$185,093	+$13,711	$85,093	1.85×
Year 9	$199,900	+$14,807	$99,900	2.00×
Year 10	$215,892	+$15,992	$115,892	2.16×

Year	Balance	Interest
Yr 1	$108,000	+$8,000
Yr 2	$116,640	+$8,640
Yr 3	$125,971	+$9,331
Yr 4	$136,049	+$10,078
Yr 5	$146,933	+$10,884
Yr 6	$158,687	+$11,755
Yr 7	$171,382	+$12,695
Yr 8	$185,093	+$13,711
Yr 9	$199,900	+$14,807
Yr 10	$215,892	+$15,992

$100,000 at 8% for 10 Years

How $100,000 grows at 8%

Year-by-year projection

Growth chart

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