Finance & Money
Investment Return Calculator
Reconcile beginning value, contributions, withdrawals, and ending value to isolate investment gain, then show a simple return and its annualized equivalent.
Net external cash added-
Ending value less beginning value and net cash-
Simple return on beginning value-
Annualized simple-period return-
Ending value minus beginning value-
Investment gain share of total positive wealth change-
Decision view
Portfolio value-change reconciliation
Portfolio value-change reconciliationExternal cash flows are separated from investment gain before return is calculated.
Exact scenario comparisonEnding portfolio value changes while all other entered assumptions remain constant.
| Ending portfolio value | Net external cash added | Ending value less beginning value and net cash | Simple return on beginning value | Annualized simple-period return | Ending value minus beginning value | Investment gain share of total positive wealth change |
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How to use Investment Return Calculator
- Use values and cash flows from the same measurement period.
- Treat deposits and withdrawals as external cash.
- Use time- or money-weighted methods when cash-flow timing is material.
Calculator guide
Understanding Investment Return Calculator
Investment performance cannot be read directly from account-value change because deposits and withdrawals are external cash flows rather than investment gain.
Calculation method
How the calculation works
Separate external contributions and withdrawals from the change in portfolio value, then calculate a simple and annualized return estimate. Subtract beginning value and net external cash from ending value, divide the residual gain by beginning value, and compound or decompound that simple-period return over the entered years.
Performance bridge
Explain every dollar of ending value
The reconciliation prevents deposits from being reported as investment skill.
Worked situations
Practical examples
- An account can rise while investments lose money if deposits exceed the decline.
- A withdrawal can make ending value lower even during a positive-return period.
- Annualizing a short observation can exaggerate an unusual period.
Better inputs
Useful tips
- Reconcile cash flows from statements.
- Use exact dated transactions for formal performance reporting.
- Do not compare returns covering different period lengths without annualization.
Before relying on the result
Limitations and common mistakes
- Cash-flow timing is ignored.
- The result is neither time-weighted nor money-weighted performance.
- Taxes, fees, income distributions, and valuation timing can alter interpretation.
Reference
Key terms
- External cash flow
- Contribution or withdrawal not produced by portfolio performance.
- Investment gain
- Ending value after removing beginning value and net external cash.
- Simple return
- Investment gain divided by beginning value.
- Annualized return
- Equivalent yearly compound rate for the entered period.
Important note
Calculated from the entered values and stated financial terms. It is not a product quote, lending decision, tax filing, or investment recommendation.
Frequently asked questions
Why not divide ending value by beginning value?
That would treat contributions and withdrawals as investment performance.
Is this a time-weighted return?
No.
Can investment gain be negative while the account grows?
Yes, when net contributions exceed the loss.
Should a one-month return be annualized?
It can be mathematically annualized, but the result may be misleading if the month is unusual.