Question 1

What does $100,000 grow to at 4% for 10 years?

Accepted Answer

$100,000 invested at 4% annual compound interest for 10 years grows to $148,024. Your original investment earns $48,024 in interest — a 48.0% total return and a 1.48× multiplier on your money.

Question 2

How long does it take to double money at 4%?

Accepted Answer

At 4% annual compound interest, your money doubles approximately every 18 years (the Rule of 72: 72 ÷ 4 = 18). Over 10 years, $100,000 has the potential to double 0.6 times.

Question 3

Is 4% a realistic return?

Accepted Answer

4% 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 $100,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $100,000 at 4% 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 4% return and 2.5% inflation, your real return is approximately 1.5% p.a. In real terms, $148,024 in 10 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$104,000	+$4,000
Yr 2	$108,160	+$4,160
Yr 3	$112,486	+$4,326
Yr 4	$116,986	+$4,499
Yr 5	$121,665	+$4,679
Yr 6	$126,532	+$4,867
Yr 7	$131,593	+$5,061
Yr 8	$136,857	+$5,264
Yr 9	$142,331	+$5,474
Yr 10	$148,024	+$5,693

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	$104,000	+$4,000	$4,000	1.04×
Year 2	$108,160	+$4,160	$8,160	1.08×
Year 3	$112,486	+$4,326	$12,486	1.12×
Year 4	$116,986	+$4,499	$16,986	1.17×
Year 5	$121,665	+$4,679	$21,665	1.22×
Year 6	$126,532	+$4,867	$26,532	1.27×
Year 7	$131,593	+$5,061	$31,593	1.32×
Year 8	$136,857	+$5,264	$36,857	1.37×
Year 9	$142,331	+$5,474	$42,331	1.42×
Year 10	$148,024	+$5,693	$48,024	1.48×

Year	Balance	Interest
Yr 1	$104,000	+$4,000
Yr 2	$108,160	+$4,160
Yr 3	$112,486	+$4,326
Yr 4	$116,986	+$4,499
Yr 5	$121,665	+$4,679
Yr 6	$126,532	+$4,867
Yr 7	$131,593	+$5,061
Yr 8	$136,857	+$5,264
Yr 9	$142,331	+$5,474
Yr 10	$148,024	+$5,693

$100,000 at 4% for 10 Years

How $100,000 grows at 4%

Year-by-year projection

Growth chart

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