Investment Return Calculator
Measure investment results clearly. Estimate net gain and simple return on contributed dollars. Annualized return is shown only when the starting and ending values are the complete cash flow.
Investment return estimate
How the estimate works
- Net gain subtracts starting value and contributions from ending value. Annualized return is calculated only without added contributions because contribution timing is required for a valid money-weighted result.
- Change one assumption at a time to compare scenarios.
- Use current balances, rates, costs, and timelines whenever possible.
Important limitation
Contribution timing and cash flows affect true time-weighted and money-weighted returns. Results are estimates only and are not financial, lending, legal, tax, or investment advice.
Assumptions and review
Formula review: July 29, 2026. This tool uses only the values shown above and does not pull live rates, balances, prices, or account data.
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Frequently asked questions
How does the investment return calculator work?
Net gain subtracts starting value and contributions from ending value. Annualized return is calculated only without added contributions because contribution timing is required for a valid money-weighted result.
Can I change the assumptions?
Yes. Every displayed input is editable so you can compare scenarios directly.
Are these results guaranteed?
No. Results are estimates only and should be used for planning, not as financial, legal, lending, or tax advice.