📈 Compound Interest
$1,000 at 10% for 20 Years
Investing $1,000 at 10% annual compound interest for 20 years grows to $6,727. That's $5,727 earned in interest on top of your original $1,000.
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 20 years
$6,727
Amount invested$1,000
Interest earned$5,727
Interest multiplier6.73×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $1,100 | +$100 |
| Yr 2 | $1,210 | +$110 |
| Yr 3 | $1,331 | +$121 |
| Yr 4 | $1,464 | +$133 |
| Yr 5 | $1,611 | +$146 |
| Yr 6 | $1,772 | +$161 |
| Yr 7 | $1,949 | +$177 |
| Yr 8 | $2,144 | +$195 |
| Yr 9 | $2,358 | +$214 |
| Yr 10 | $2,594 | +$236 |
| Yr 11 | $2,853 | +$259 |
| Yr 12 | $3,138 | +$285 |
| Yr 13 | $3,452 | +$314 |
| Yr 14 | $3,797 | +$345 |
| Yr 15 | $4,177 | +$380 |
| Yr 16 | $4,595 | +$418 |
| Yr 17 | $5,054 | +$459 |
| Yr 18 | $5,560 | +$505 |
| Yr 19 | $6,116 | +$556 |
| Yr 20 | $6,727 | +$612 |
Final balance after 20 years
$6,727
Invested
$1,000
Interest earned
$5,727
Multiplier
6.73×
How $1,000 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 20 years, that compounds to a 6.73× multiplier.
In year 1, $1,000 earns $100 in interest. By year 20, the annual interest has grown to $612 — 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 | $1,100 | +$100 | $100 | 1.10× |
| Year 2 | $1,210 | +$110 | $210 | 1.21× |
| Year 3 | $1,331 | +$121 | $331 | 1.33× |
| Year 4 | $1,464 | +$133 | $464 | 1.46× |
| Year 5 | $1,611 | +$146 | $611 | 1.61× |
| Year 6 | $1,772 | +$161 | $772 | 1.77× |
| Year 7 | $1,949 | +$177 | $949 | 1.95× |
| Year 8 | $2,144 | +$195 | $1,144 | 2.14× |
| Year 9 | $2,358 | +$214 | $1,358 | 2.36× |
| Year 10 | $2,594 | +$236 | $1,594 | 2.59× |
| Year 11 | $2,853 | +$259 | $1,853 | 2.85× |
| Year 12 | $3,138 | +$285 | $2,138 | 3.14× |
| Year 13 | $3,452 | +$314 | $2,452 | 3.45× |
| Year 14 | $3,797 | +$345 | $2,797 | 3.80× |
| Year 15 | $4,177 | +$380 | $3,177 | 4.18× |
| Year 16 | $4,595 | +$418 | $3,595 | 4.59× |
| Year 17 | $5,054 | +$459 | $4,054 | 5.05× |
| Year 18 | $5,560 | +$505 | $4,560 | 5.56× |
| Year 19 | $6,116 | +$556 | $5,116 | 6.12× |
| Year 20 | $6,727 | +$612 | $5,727 | 6.73× |
Growth chart
Balance growth over 20 years
Principal
Interest earned
Frequently asked questions
Explore other scenarios
$1,000 for 20 years — other rates
$1,000 at 10% — other time horizons
Related calculators
Compound Interest Calculator
Australia 2026
$
%
$
Total value after 20 years
$6,727
Amount invested$1,000
Interest earned$5,727
Interest multiplier6.73×
Year-by-year growth
| Year | Balance | Interest |
|---|---|---|
| Yr 1 | $1,100 | +$100 |
| Yr 2 | $1,210 | +$110 |
| Yr 3 | $1,331 | +$121 |
| Yr 4 | $1,464 | +$133 |
| Yr 5 | $1,611 | +$146 |
| Yr 6 | $1,772 | +$161 |
| Yr 7 | $1,949 | +$177 |
| Yr 8 | $2,144 | +$195 |
| Yr 9 | $2,358 | +$214 |
| Yr 10 | $2,594 | +$236 |
| Yr 11 | $2,853 | +$259 |
| Yr 12 | $3,138 | +$285 |
| Yr 13 | $3,452 | +$314 |
| Yr 14 | $3,797 | +$345 |
| Yr 15 | $4,177 | +$380 |
| Yr 16 | $4,595 | +$418 |
| Yr 17 | $5,054 | +$459 |
| Yr 18 | $5,560 | +$505 |
| Yr 19 | $6,116 | +$556 |
| Yr 20 | $6,727 | +$612 |