MFE, or Maximum Favorable Excursion, is the largest unrealized profit a trade reached at any point during its lifetime, measured from the entry price to the best price the trade traveled to before it was closed. Recorded for every trade — winners and losers — it captures the peak paper profit available during the position. Comparing MFE to the actual exit price reveals exactly how much money the trader left on the table or, conversely, how often paper profits evaporated before being captured.
Formula
For a long trade:
MFE = Highest Price Reached During Trade − Entry Price
For a short trade:
MFE = Entry Price − Lowest Price Reached During Trade
Expressed in pips, points, or dollars. A losing trade can still have meaningful MFE if it moved into profit before reversing and stopping out.
Worked example
You short USDJPY at 152.00 with a target at 151.00. The price falls to 151.20, then rallies back and stops you out at 152.30.
MFE = 152.00 − 151.20 = 80 pips in favor Final result: −30 pips loser, but with 80 pips of MFE that you never captured
That trade was 80% of the way to target before reversing — a setup management problem, not a setup quality problem.
Why it matters
MFE shows whether your exits or your entries are the bottleneck. If average MFE on losers is consistently large, your trades work but you do not protect profit fast enough. If average MFE on winners is much larger than your actual exit, you are closing too early. The Trader+AI journal plots MFE-vs-exit on every trade card so the gap is impossible to miss.
Common pitfalls
MFE rewards looking smart in hindsight — every trade has an MFE peak you "could have" exited at, but in the moment that peak was not visible. Use MFE to find systemic patterns (e.g. "I exit at 60% of MFE on average") not to beat yourself up about individual trades. Also: like MAE, accurate MFE requires tick or minute data.