What does $100,000 grow to at 5% for 25 years?

$100,000 invested at 5% annual compound interest for 25 years grows to $338,635. Your original investment earns $238,635 in interest — a 238.6% total return and a 3.39× multiplier on your money.

How long does it take to double money at 5%?

At 5% annual compound interest, your money doubles approximately every 14.4 years (the Rule of 72: 72 ÷ 5 = 14.4). Over 25 years, $100,000 has the potential to double 1.7 times.

Is 5% a realistic return?

5% 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.

What's the effect of adding regular contributions?

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 5% for 25 years would result in a significantly larger final balance. Use the interactive calculator above to model your own contribution amount.

How does inflation affect this result?

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 5% return and 2.5% inflation, your real return is approximately 2.5% p.a. In real terms, $338,635 in 25 years would buy meaningfully less than it does today.

📈 Compound Interest

$100,000 at 5% for 25 Years

Investing $100,000 at 5% annual compound interest for 25 years grows to $338,635. That's $238,635 earned in interest on top of your original $100,000.

If you want to adjust the return assumption, extend the timeframe, or add regular contributions, use the compound interest calculator.

If you want the plain-English explanation behind the numbers, read our guide to compound interest.

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Compound Interest Calculator

Australia 2026

Starting amount

Annual return (%)

Time period (years)

Regular contribution

Contribution frequency

Total value after 25 years

$338,635

Amount invested$100,000

Interest earned$238,635

Interest multiplier3.39×

Year-by-year growth

Year	Balance	Interest
Yr 1	$105,000	+$5,000
Yr 2	$110,250	+$5,250
Yr 3	$115,763	+$5,513
Yr 4	$121,551	+$5,788
Yr 5	$127,628	+$6,078
Yr 6	$134,010	+$6,381
Yr 7	$140,710	+$6,700
Yr 8	$147,746	+$7,036
Yr 9	$155,133	+$7,387
Yr 10	$162,889	+$7,757
Yr 11	$171,034	+$8,144
Yr 12	$179,586	+$8,552
Yr 13	$188,565	+$8,979
Yr 14	$197,993	+$9,428
Yr 15	$207,893	+$9,900
Yr 16	$218,287	+$10,395
Yr 17	$229,202	+$10,914
Yr 18	$240,662	+$11,460
Yr 19	$252,695	+$12,033
Yr 20	$265,330	+$12,635
Yr 21	$278,596	+$13,266
Yr 22	$292,526	+$13,930
Yr 23	$307,152	+$14,626
Yr 24	$322,510	+$15,358
Yr 25	$338,635	+$16,125

Final balance after 25 years

$338,635

Invested

$100,000

Interest earned

$238,635

Multiplier

3.39×

How $100,000 grows at 5%

Compound interest earns returns on your returns — not just your original investment. At 5% per year, your money doubles every 14.4 years (the Rule of 72). Over 25 years, that compounds to a 3.39× multiplier.

In year 1, $100,000 earns $5,000 in interest. By year 25, the annual interest has grown to $16,125 — because each year's interest is calculated on a larger balance.

This is why longer holding periods matter so much. The later years do more of the heavy lifting, especially once the balance is large enough to generate bigger dollar returns each year.

$100,000 for 25 years at different rates

Rate	Final balance	Interest earned	Multiplier
4%	$266,584	$166,584	2.67×
5% ◀	$338,635	$238,635	3.39×
6%	$429,187	$329,187	4.29×
7%	$542,743	$442,743	5.43×
8%	$684,848	$584,848	6.85×
9%	$862,308	$762,308	8.62×
10%	$1,083,471	$983,471	10.83×

Year-by-year projection

Year	Balance	Interest this year	Total interest	Growth
Year 1	$105,000	+$5,000	$5,000	1.05×
Year 2	$110,250	+$5,250	$10,250	1.10×
Year 3	$115,763	+$5,513	$15,763	1.16×
Year 4	$121,551	+$5,788	$21,551	1.22×
Year 5	$127,628	+$6,078	$27,628	1.28×
Year 6	$134,010	+$6,381	$34,010	1.34×
Year 7	$140,710	+$6,700	$40,710	1.41×
Year 8	$147,746	+$7,036	$47,746	1.48×
Year 9	$155,133	+$7,387	$55,133	1.55×
Year 10	$162,889	+$7,757	$62,889	1.63×
Year 11	$171,034	+$8,144	$71,034	1.71×
Year 12	$179,586	+$8,552	$79,586	1.80×
Year 13	$188,565	+$8,979	$88,565	1.89×
Year 14	$197,993	+$9,428	$97,993	1.98×
Year 15	$207,893	+$9,900	$107,893	2.08×
Year 16	$218,287	+$10,395	$118,287	2.18×
Year 17	$229,202	+$10,914	$129,202	2.29×
Year 18	$240,662	+$11,460	$140,662	2.41×
Year 19	$252,695	+$12,033	$152,695	2.53×
Year 20	$265,330	+$12,635	$165,330	2.65×
Year 21	$278,596	+$13,266	$178,596	2.79×
Year 22	$292,526	+$13,930	$192,526	2.93×
Year 23	$307,152	+$14,626	$207,152	3.07×
Year 24	$322,510	+$15,358	$222,510	3.23×
Year 25	$338,635	+$16,125	$238,635	3.39×

Growth chart

Balance growth over 25 years

Principal

Interest earned

Frequently asked questions

Related compound interest scenarios

Use these nearby examples to compare what changes when you keep the same starting balance, extend the investing period, or test a more aggressive return assumption.

$100,000 invested for 20 years at 5%

Projected balance: $265,330

$100,000 invested for 30 years at 5%

Projected balance: $432,194

$100,000 invested for 15 years at 5%

Projected balance: $207,893

$100,000 invested for 10 years at 5%

Projected balance: $162,889

Compound interest guide and tools

Compound interest calculator

Test a different return, timeframe, or contribution amount.

Guide to compound interest

Understand the formula, time effect, and worked examples.

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Compound Interest Calculator

Australia 2026

Starting amount

Annual return (%)

Time period (years)

Regular contribution

Contribution frequency

Total value after 25 years

$338,635

Amount invested$100,000

Interest earned$238,635

Interest multiplier3.39×

Year-by-year growth

Year	Balance	Interest
Yr 1	$105,000	+$5,000
Yr 2	$110,250	+$5,250
Yr 3	$115,763	+$5,513
Yr 4	$121,551	+$5,788
Yr 5	$127,628	+$6,078
Yr 6	$134,010	+$6,381
Yr 7	$140,710	+$6,700
Yr 8	$147,746	+$7,036
Yr 9	$155,133	+$7,387
Yr 10	$162,889	+$7,757
Yr 11	$171,034	+$8,144
Yr 12	$179,586	+$8,552
Yr 13	$188,565	+$8,979
Yr 14	$197,993	+$9,428
Yr 15	$207,893	+$9,900
Yr 16	$218,287	+$10,395
Yr 17	$229,202	+$10,914
Yr 18	$240,662	+$11,460
Yr 19	$252,695	+$12,033
Yr 20	$265,330	+$12,635
Yr 21	$278,596	+$13,266
Yr 22	$292,526	+$13,930
Yr 23	$307,152	+$14,626
Yr 24	$322,510	+$15,358
Yr 25	$338,635	+$16,125