Useful next calculations
When to use this calculator
- Before choosing between saving, investing or changing a contribution.
- When you want to compare cautious, base and optimistic return assumptions.
- When you need a projection before making a longer-term decision.
- When you want to see whether starting earlier or contributing more changes the outcome more.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Initial Investment ($) | $5,000 |
| Monthly Contribution ($) | $200 |
| Expected Annual Return (%) | 8% |
| Years | 20 |
For those figures the calculator returns:
- Portfolio value: $142,438.10
- Total invested: $53,000.00
- Growth: $89,438.10
Common mistakes
- Using an assumption that is not supported by a current local quote, bill, statement or official source.
- Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- Mixing monthly and annual inputs without converting them consistently.
- Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
Questions people ask
Global equity index funds have historically returned around 7–10% per year over long periods (20+ years), though past performance does not guarantee future results.