📈 Compound Interest
$100,000 at 10% for 15 Years
Investing $100,000 at 10% annual compound interest for 15 years grows to $417,725. That's $317,725 earned in interest on top of your original $100,000.
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 15 years
$417,725
Amount invested$100,000
Interest earned$317,725
Interest multiplier4.18×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $110,000 | +$10,000 |
| Yr 2 | $121,000 | +$11,000 |
| Yr 3 | $133,100 | +$12,100 |
| Yr 4 | $146,410 | +$13,310 |
| Yr 5 | $161,051 | +$14,641 |
| Yr 6 | $177,156 | +$16,105 |
| Yr 7 | $194,872 | +$17,716 |
| Yr 8 | $214,359 | +$19,487 |
| Yr 9 | $235,795 | +$21,436 |
| Yr 10 | $259,374 | +$23,579 |
| Yr 11 | $285,312 | +$25,937 |
| Yr 12 | $313,843 | +$28,531 |
| Yr 13 | $345,227 | +$31,384 |
| Yr 14 | $379,750 | +$34,523 |
| Yr 15 | $417,725 | +$37,975 |
Final balance after 15 years
$417,725
Invested
$100,000
Interest earned
$317,725
Multiplier
4.18×
How $100,000 grows at 10%
Compound interest earns returns on your returns — not just your original investment. At 10% per year, your money doubles every 7.2 years (the Rule of 72). Over 15 years, that compounds to a 4.18× multiplier.
In year 1, $100,000 earns $10,000 in interest. By year 15, the annual interest has grown to $37,975 — because each year's interest is calculated on a larger balance.
Year-by-year projection
| Year | Balance | Interest this year | Total interest | Growth |
|---|---|---|---|---|
| Year 1 | $110,000 | +$10,000 | $10,000 | 1.10× |
| Year 2 | $121,000 | +$11,000 | $21,000 | 1.21× |
| Year 3 | $133,100 | +$12,100 | $33,100 | 1.33× |
| Year 4 | $146,410 | +$13,310 | $46,410 | 1.46× |
| Year 5 | $161,051 | +$14,641 | $61,051 | 1.61× |
| Year 6 | $177,156 | +$16,105 | $77,156 | 1.77× |
| Year 7 | $194,872 | +$17,716 | $94,872 | 1.95× |
| Year 8 | $214,359 | +$19,487 | $114,359 | 2.14× |
| Year 9 | $235,795 | +$21,436 | $135,795 | 2.36× |
| Year 10 | $259,374 | +$23,579 | $159,374 | 2.59× |
| Year 11 | $285,312 | +$25,937 | $185,312 | 2.85× |
| Year 12 | $313,843 | +$28,531 | $213,843 | 3.14× |
| Year 13 | $345,227 | +$31,384 | $245,227 | 3.45× |
| Year 14 | $379,750 | +$34,523 | $279,750 | 3.80× |
| Year 15 | $417,725 | +$37,975 | $317,725 | 4.18× |
Growth chart
Balance growth over 15 years
Principal
Interest earned
Frequently asked questions
Explore other scenarios
$100,000 for 15 years — other rates
$100,000 at 10% — other time horizons
Related calculators
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 15 years
$417,725
Amount invested$100,000
Interest earned$317,725
Interest multiplier4.18×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $110,000 | +$10,000 |
| Yr 2 | $121,000 | +$11,000 |
| Yr 3 | $133,100 | +$12,100 |
| Yr 4 | $146,410 | +$13,310 |
| Yr 5 | $161,051 | +$14,641 |
| Yr 6 | $177,156 | +$16,105 |
| Yr 7 | $194,872 | +$17,716 |
| Yr 8 | $214,359 | +$19,487 |
| Yr 9 | $235,795 | +$21,436 |
| Yr 10 | $259,374 | +$23,579 |
| Yr 11 | $285,312 | +$25,937 |
| Yr 12 | $313,843 | +$28,531 |
| Yr 13 | $345,227 | +$31,384 |
| Yr 14 | $379,750 | +$34,523 |
| Yr 15 | $417,725 | +$37,975 |