Question 1

What does $500 grow to at 4% for 10 years?

Accepted Answer

$500 invested at 4% annual compound interest for 10 years grows to $740. Your original investment earns $240 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, $500 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 $500 with no additional contributions. Adding regular contributions compounds the growth dramatically. For example, adding $200/month to $500 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, $740 in 10 years would buy meaningfully less than it does today.

Year	Balance	Interest
Yr 1	$520	+$20
Yr 2	$541	+$21
Yr 3	$562	+$22
Yr 4	$585	+$22
Yr 5	$608	+$23
Yr 6	$633	+$24
Yr 7	$658	+$25
Yr 8	$684	+$26
Yr 9	$712	+$27
Yr 10	$740	+$28

Rate	Final balance	Interest earned	Multiplier
4% ◀	$740	$240	1.48×
5%	$814	$314	1.63×
6%	$895	$395	1.79×
7%	$984	$484	1.97×
8%	$1,079	$579	2.16×
9%	$1,184	$684	2.37×
10%	$1,297	$797	2.59×

Year	Balance	Interest this year	Total interest	Growth
Year 1	$520	+$20	$20	1.04×
Year 2	$541	+$21	$41	1.08×
Year 3	$562	+$22	$62	1.12×
Year 4	$585	+$22	$85	1.17×
Year 5	$608	+$23	$108	1.22×
Year 6	$633	+$24	$133	1.27×
Year 7	$658	+$25	$158	1.32×
Year 8	$684	+$26	$184	1.37×
Year 9	$712	+$27	$212	1.42×
Year 10	$740	+$28	$240	1.48×

Year	Balance	Interest
Yr 1	$520	+$20
Yr 2	$541	+$21
Yr 3	$562	+$22
Yr 4	$585	+$22
Yr 5	$608	+$23
Yr 6	$633	+$24
Yr 7	$658	+$25
Yr 8	$684	+$26
Yr 9	$712	+$27
Yr 10	$740	+$28

$500 at 4% for 10 Years

How $500 grows at 4%

Year-by-year projection

Growth chart

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