📈 Compound Interest
$10,000 at 8% for 20 Years
Investing $10,000 at 8% annual compound interest for 20 years grows to $46,610. That's $36,610 earned in interest on top of your original $10,000.
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 20 years
$46,610
Amount invested$10,000
Interest earned$36,610
Interest multiplier4.66×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $10,800 | +$800 |
| Yr 2 | $11,664 | +$864 |
| Yr 3 | $12,597 | +$933 |
| Yr 4 | $13,605 | +$1,008 |
| Yr 5 | $14,693 | +$1,088 |
| Yr 6 | $15,869 | +$1,175 |
| Yr 7 | $17,138 | +$1,269 |
| Yr 8 | $18,509 | +$1,371 |
| Yr 9 | $19,990 | +$1,481 |
| Yr 10 | $21,589 | +$1,599 |
| Yr 11 | $23,316 | +$1,727 |
| Yr 12 | $25,182 | +$1,865 |
| Yr 13 | $27,196 | +$2,015 |
| Yr 14 | $29,372 | +$2,176 |
| Yr 15 | $31,722 | +$2,350 |
| Yr 16 | $34,259 | +$2,538 |
| Yr 17 | $37,000 | +$2,741 |
| Yr 18 | $39,960 | +$2,960 |
| Yr 19 | $43,157 | +$3,197 |
| Yr 20 | $46,610 | +$3,453 |
Final balance after 20 years
$46,610
Invested
$10,000
Interest earned
$36,610
Multiplier
4.66×
How $10,000 grows at 8%
Compound interest earns returns on your returns — not just your original investment. At 8% per year, your money doubles every 9 years (the Rule of 72). Over 20 years, that compounds to a 4.66× multiplier.
In year 1, $10,000 earns $800 in interest. By year 20, the annual interest has grown to $3,453 — 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 | $10,800 | +$800 | $800 | 1.08× |
| Year 2 | $11,664 | +$864 | $1,664 | 1.17× |
| Year 3 | $12,597 | +$933 | $2,597 | 1.26× |
| Year 4 | $13,605 | +$1,008 | $3,605 | 1.36× |
| Year 5 | $14,693 | +$1,088 | $4,693 | 1.47× |
| Year 6 | $15,869 | +$1,175 | $5,869 | 1.59× |
| Year 7 | $17,138 | +$1,269 | $7,138 | 1.71× |
| Year 8 | $18,509 | +$1,371 | $8,509 | 1.85× |
| Year 9 | $19,990 | +$1,481 | $9,990 | 2.00× |
| Year 10 | $21,589 | +$1,599 | $11,589 | 2.16× |
| Year 11 | $23,316 | +$1,727 | $13,316 | 2.33× |
| Year 12 | $25,182 | +$1,865 | $15,182 | 2.52× |
| Year 13 | $27,196 | +$2,015 | $17,196 | 2.72× |
| Year 14 | $29,372 | +$2,176 | $19,372 | 2.94× |
| Year 15 | $31,722 | +$2,350 | $21,722 | 3.17× |
| Year 16 | $34,259 | +$2,538 | $24,259 | 3.43× |
| Year 17 | $37,000 | +$2,741 | $27,000 | 3.70× |
| Year 18 | $39,960 | +$2,960 | $29,960 | 4.00× |
| Year 19 | $43,157 | +$3,197 | $33,157 | 4.32× |
| Year 20 | $46,610 | +$3,453 | $36,610 | 4.66× |
Growth chart
Balance growth over 20 years
Principal
Interest earned
Frequently asked questions
Explore other scenarios
$10,000 for 20 years — other rates
$10,000 at 8% — other time horizons
Related calculators
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 20 years
$46,610
Amount invested$10,000
Interest earned$36,610
Interest multiplier4.66×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $10,800 | +$800 |
| Yr 2 | $11,664 | +$864 |
| Yr 3 | $12,597 | +$933 |
| Yr 4 | $13,605 | +$1,008 |
| Yr 5 | $14,693 | +$1,088 |
| Yr 6 | $15,869 | +$1,175 |
| Yr 7 | $17,138 | +$1,269 |
| Yr 8 | $18,509 | +$1,371 |
| Yr 9 | $19,990 | +$1,481 |
| Yr 10 | $21,589 | +$1,599 |
| Yr 11 | $23,316 | +$1,727 |
| Yr 12 | $25,182 | +$1,865 |
| Yr 13 | $27,196 | +$2,015 |
| Yr 14 | $29,372 | +$2,176 |
| Yr 15 | $31,722 | +$2,350 |
| Yr 16 | $34,259 | +$2,538 |
| Yr 17 | $37,000 | +$2,741 |
| Yr 18 | $39,960 | +$2,960 |
| Yr 19 | $43,157 | +$3,197 |
| Yr 20 | $46,610 | +$3,453 |