Question 1

What does $1,000 grow to at 4% for 15 years?

Accepted Answer

$1,000 invested at 4% annual compound interest for 15 years grows to $1,801. Your original investment earns $801 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, $1,000 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 $1,000 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $1,000 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, $1,801 in 15 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$1,040	+$40
Yr 2	$1,082	+$42
Yr 3	$1,125	+$43
Yr 4	$1,170	+$45
Yr 5	$1,217	+$47
Yr 6	$1,265	+$49
Yr 7	$1,316	+$51
Yr 8	$1,369	+$53
Yr 9	$1,423	+$55
Yr 10	$1,480	+$57
Yr 11	$1,539	+$59
Yr 12	$1,601	+$62
Yr 13	$1,665	+$64
Yr 14	$1,732	+$67
Yr 15	$1,801	+$69

Rate	Final balance	Interest earned	Multiplier
4% ◀	$1,801	$801	1.80×
5%	$2,079	$1,079	2.08×
6%	$2,397	$1,397	2.40×
7%	$2,759	$1,759	2.76×
8%	$3,172	$2,172	3.17×
9%	$3,642	$2,642	3.64×
10%	$4,177	$3,177	4.18×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$1,040	+$40	$40	1.04×
Year 2	$1,082	+$42	$82	1.08×
Year 3	$1,125	+$43	$125	1.12×
Year 4	$1,170	+$45	$170	1.17×
Year 5	$1,217	+$47	$217	1.22×
Year 6	$1,265	+$49	$265	1.27×
Year 7	$1,316	+$51	$316	1.32×
Year 8	$1,369	+$53	$369	1.37×
Year 9	$1,423	+$55	$423	1.42×
Year 10	$1,480	+$57	$480	1.48×
Year 11	$1,539	+$59	$539	1.54×
Year 12	$1,601	+$62	$601	1.60×
Year 13	$1,665	+$64	$665	1.67×
Year 14	$1,732	+$67	$732	1.73×
Year 15	$1,801	+$69	$801	1.80×

Year	Balance	Interest
Yr 1	$1,040	+$40
Yr 2	$1,082	+$42
Yr 3	$1,125	+$43
Yr 4	$1,170	+$45
Yr 5	$1,217	+$47
Yr 6	$1,265	+$49
Yr 7	$1,316	+$51
Yr 8	$1,369	+$53
Yr 9	$1,423	+$55
Yr 10	$1,480	+$57
Yr 11	$1,539	+$59
Yr 12	$1,601	+$62
Yr 13	$1,665	+$64
Yr 14	$1,732	+$67
Yr 15	$1,801	+$69

$1,000 at 4% for 15 Years

How $1,000 grows at 4%

Year-by-year projection

Growth chart

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