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Time-weighted return. Related Articles. Time-weighted returns is a measure of the compound rate of return of a portfolio over a stated period of time. It requires a set of sub-period returns to be calculated whenever there is an external cash flow, such as a deposit or withdrawal from the portfolio.
IRR Formula. To calculate Internal Rate of Return using the IRR formula in Excel, you need a series of periodic cash flows like that shown in the figure below.The IRR can then be calculated using the following formula, with 0.1 being the initial guess at the rate:o calculate Internal Rate of Return using the IRR formula in Excel, you need a series of periodic cash flows like that shown in the figure below.