Want more scenarios like this? Explore the weekly hub and monthly hub, then run your own numbers in the calculator.
Small weekly investing can snowball. Use the calculator to test conservative and optimistic return assumptions.
Try the Money Growth CalculatorThere are three main inputs that decide the outcome: how much you invest, how long you invest, and your average return. Compounding makes the later years do more work than the early years.
| Return rate | Final balance | Total contributed |
|---|---|---|
| 5% (conservative) | ~$89,000 | $52,000 |
| 7% (mid) | ~$113,000 | $52,000 |
| 10% (optimistic) | ~$165,000 | $52,000 |
Investing $50 a week for 20 years means contributing $52,000 of your own money — and at a 7% return, compounding adds around $61,000 on top, growing your balance to roughly $113,000. That's more than double your contributions at mid-range returns, purely from the power of time and consistency. For many Australians, $50 a week is achievable by trimming a few small expenses, yet over 20 years it can quietly build a six-figure sum.
Then compare how much difference a few percentage points makes over 20 years.
If you can add 5 more years (25 total), compounding usually increases the result dramatically — often more than trying to “catch up” later.
Often yes. Consistency + time can create surprisingly large outcomes. The exact result depends on returns and how long you keep investing.
Weekly can help you stay consistent. For long-term modelling, converting to a monthly amount is usually close enough.
Try a conservative rate (e.g. 5%), a mid-range assumption (e.g. 7%), and an optimistic one (e.g. 10%). Then focus on the range, not a single number.
No. Use the result as an estimate. Fees, taxes and inflation can materially change the real-world outcome.
See /how-compound-interest-works.html for the compound interest formula and explanation.
These pages connect to calculators so you can run your own numbers.
Keep exploring — these pages connect directly to calculators so you can run your own numbers.