Use conservative, mid, and optimistic return assumptions to see a realistic range of outcomes — then decide what’s feasible for your budget.
Open the Money Growth Calculator| Return rate | Final balance | Total contributed |
|---|---|---|
| 5% (conservative) | ~$202,000 | $156,000 |
| 7% (mid) | ~$225,000 | $156,000 |
| 10% (optimistic) | ~$266,000 | $156,000 |
Investing $300 a week for 10 years means contributing $156,000 of your own money — and at a 7% return, compounding adds around $69,000 on top, growing your balance to roughly $225,000. At this level you're building a quarter of a million dollars within a single decade, a meaningful financial milestone for most Australians. $300 a week requires real commitment but for those who can sustain it, a decade of consistent investing at this level creates a strong platform for long term wealth.
If you invest $300/week for 10 years, the result depends heavily on the return rate. Use the calculator to test a conservative, mid, and optimistic scenario.
It’s a solid starting habit. The best amount is one you can maintain consistently, then increase over time.
Use 5% for a conservative baseline, 7% for a mid-range estimate, and 10% as an optimistic scenario.
No. Treat results as estimates. You can lower your assumed return rate to be more conservative.
For long-term modelling, converting to monthly is usually close enough.
See the simple explanation on /how-compound-interest-works.html.