Expectancy with every outcome included

For a recorded sample, average result per completed position is total net result divided by the number of completed positions. This is a description of that sample. Calling it sample expectancy can be useful, provided you do not turn it into a promise about the next position or an assumed permanent property of a strategy.

A weighted calculation gives the same answer when the categories and units are consistent: winner fraction times average positive result, minus loser fraction times average loss magnitude, plus any other outcome category. If some positions finish at zero net, they still count in the denominator. Define a winner after the costs included in your calculation, rather than mixing gross winners with net totals.

The linked calculator assumes two outcomes: every non-winner is a loser. It cannot reproduce a sample containing zero results. Use the ten-row manual exercise below for that sample. For a separate reproducible calculator example, enter 40% wins, $30 average win, $20 average loss and $0 additional cost: four winners and six losers average $0. Inputs already net of charges should not have the same costs deducted again.