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) | ~$58,000 | $39,000 |
| 7% (mid) | ~$69,000 | $39,000 |
| 10% (optimistic) | ~$90,000 | $39,000 |
Investing $50 a week for 15 years means contributing $39,000 of your own money — and at a 7% return, compounding adds around $30,000 on top, growing your total to roughly $69,000. Fifteen years hits a sweet spot where compounding really starts to accelerate — you're getting back nearly twice what you put in at mid-range returns. For many Australians, this timeframe lines up perfectly with a mid-career push toward a meaningful savings milestone.
If you invest $50/week for 15 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.