Use conservative, mid, and optimistic return assumptions to see a realistic range of outcomes — then decide what’s feasible for your budget.
You may also want to see: $100 a week invested for 10 years
Or explore a higher weekly amount: $200 a week invested for 10 years
| Return rate | Final balance | Total contributed |
|---|---|---|
| 5% (conservative) | ~$45,000 | $26,000 |
| 7% (mid) | ~$56,000 | $26,000 |
| 10% (optimistic) | ~$82,000 | $26,000 |
Investing $25 a week for 20 years means putting in $26,000 of your own money — roughly the cost of a modest used car. At a 7% return, compounding adds around $30,000 on top, growing your total to approximately $56,000. Twenty years is long enough for the compounding effect to really kick in, more than doubling your contributions at mid-range returns. It's a powerful reminder that starting small and staying consistent beats waiting until you can invest more.
If you invest $25/week for 20 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.