Question 1

What does $5,000 grow to at 4% for 15 years?

Accepted Answer

$5,000 invested at 4% annual compound interest for 15 years grows to $9,005. Your original investment earns $4,005 in interest — a 80.1% total return and a 1.80× 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 15 years, $5,000 has the potential to double 0.8 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 $5,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $5,000 at 4% 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 4% return and 2.5% inflation, your real return is approximately 1.5% p.a. In real terms, $9,005 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$5,200	+$200
Yr 2	$5,408	+$208
Yr 3	$5,624	+$216
Yr 4	$5,849	+$225
Yr 5	$6,083	+$234
Yr 6	$6,327	+$243
Yr 7	$6,580	+$253
Yr 8	$6,843	+$263
Yr 9	$7,117	+$274
Yr 10	$7,401	+$285
Yr 11	$7,697	+$296
Yr 12	$8,005	+$308
Yr 13	$8,325	+$320
Yr 14	$8,658	+$333
Yr 15	$9,005	+$346

Rate	Final balance	Interest earned	Multiplier
4% ◀	$9,005	$4,005	1.80×
5%	$10,395	$5,395	2.08×
6%	$11,983	$6,983	2.40×
7%	$13,795	$8,795	2.76×
8%	$15,861	$10,861	3.17×
9%	$18,212	$13,212	3.64×
10%	$20,886	$15,886	4.18×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$5,200	+$200	$200	1.04×
Year 2	$5,408	+$208	$408	1.08×
Year 3	$5,624	+$216	$624	1.12×
Year 4	$5,849	+$225	$849	1.17×
Year 5	$6,083	+$234	$1,083	1.22×
Year 6	$6,327	+$243	$1,327	1.27×
Year 7	$6,580	+$253	$1,580	1.32×
Year 8	$6,843	+$263	$1,843	1.37×
Year 9	$7,117	+$274	$2,117	1.42×
Year 10	$7,401	+$285	$2,401	1.48×
Year 11	$7,697	+$296	$2,697	1.54×
Year 12	$8,005	+$308	$3,005	1.60×
Year 13	$8,325	+$320	$3,325	1.67×
Year 14	$8,658	+$333	$3,658	1.73×
Year 15	$9,005	+$346	$4,005	1.80×

Year	Balance	Interest
Yr 1	$5,200	+$200
Yr 2	$5,408	+$208
Yr 3	$5,624	+$216
Yr 4	$5,849	+$225
Yr 5	$6,083	+$234
Yr 6	$6,327	+$243
Yr 7	$6,580	+$253
Yr 8	$6,843	+$263
Yr 9	$7,117	+$274
Yr 10	$7,401	+$285
Yr 11	$7,697	+$296
Yr 12	$8,005	+$308
Yr 13	$8,325	+$320
Yr 14	$8,658	+$333
Yr 15	$9,005	+$346

$5,000 at 4% for 15 Years

How $5,000 grows at 4%

Year-by-year projection

Growth chart

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