Probability of Profit Defined
Probability of profit, often abbreviated POP, is the estimated chance that an option position finishes at or beyond its breakeven point. It is one of the most useful single statistics in options trading because it reframes a trade away from how much you might win toward how often you would win if you placed the same trade many times. For a long call, the breakeven sits above the strike by the amount of premium paid, so the POP question becomes: how likely is the stock to clear that breakeven by expiration?
This calculator does not pretend to output a precise statistical percentage, which would require an implied-volatility input and a pricing model. Instead it isolates the input that drives POP for a long call: the size of the move the stock must make to reach breakeven. A small required move generally means a higher POP; a large one means a lower POP. Surfacing that figure lets you reason about probability honestly and compare strikes on a like-for-like basis.
High-probability long calls have small payouts because they are already near or in the money; low-probability calls offer large payouts because the market judges them unlikely to pay. A sound trade balances the two rather than chasing either alone.
How POP Inputs Become Profit Numbers
Worked Example Using the Defaults
- 1Total premium outlay = $3.00 x 100 x 1 = $300
- 2Breakeven price = $105 + $3.00 = $108.00
- 3Required move to breakeven = ($108 - $100) / $100 x 100 = 8.0%
- 4Because 8% over 45 days is a moderate move, this call has a middling probability of profit
- 5At the $115 target, profit = ($115 - $105 - $3.00) x 100 = $700
- 6Return on premium = $700 / $300 x 100 = 233.33%
- 7The trade pairs a moderate POP with a roughly 2.3-to-1 reward on premium
Interpreting POP With Reward
| Required Move | POP Tendency | Typical Payout on Premium | What It Suits |
|---|---|---|---|
| Stock already above breakeven | Highest | Low | High-conviction, capital-efficient exposure |
| 0% to 5% move needed | Above even | Moderate | Directional trades with a near-term catalyst |
| 5% to 12% move needed | Roughly balanced | Attractive | Trending names, adequate time to expiration |
| More than 12% move needed | Low | Very high | Small speculative positions only |
When to Use and When to Avoid the POP Screen
Use this screen whenever you are choosing among strikes on a single-leg long call and want a consistent way to weigh probability against reward. It is especially helpful for filtering out trades whose breakeven requires a move the stock rarely makes in the available time, which is the most common reason inexperienced buyers lose money. It pairs naturally with a separate look at the stock's historical range and any scheduled catalysts.
Avoid treating it as a substitute for a full model-based POP on multi-leg strategies. Credit spreads, iron condors, and strangles have two breakevens and a probability profile that a single required-move number cannot capture. Also avoid using it in isolation around earnings, where a volatility collapse can defeat a directionally correct trade. The required-move figure is a disciplined first filter, not the final word.
Risks the POP Number Does Not Capture
- POP says nothing about magnitude of loss; a high-probability long call can still lose its entire premium if it expires worthless.
- Implied-volatility contraction after a catalyst can shrink the option's value even when the stock moves toward your target.
- Time decay accelerates near expiration, so a slow move that would have been profitable can still lose if it arrives late.
- Bid-ask spread widens the true breakeven, quietly lowering the real probability of profit versus the quoted premium.
- POP is a long-run frequency, not a forecast for any single trade; unlikely outcomes occur regularly in markets.
Tax Treatment of POP-Screened Trades
The probability of profit has no bearing on how the IRS treats the result, but the after-tax payoff still matters for sizing. Under IRS Publication 550, gains and losses on long equity options are capital in character. A call sold to close after a holding period of one year or less is taxed at ordinary income rates as a short-term item; a longer hold may reach long-term rates. When an option lapses unexercised, the lost premium becomes a capital loss dated to the day the contract expires. Broad-based index options instead generally fall under the Section 1256 regime, where 60 percent of the result is treated as long-term and 40 percent as short-term irrespective of how long the position was held. Because ordinary rates can meaningfully shrink a winner, build that tax drag into the reward side before weighing it against POP. The foregoing is general educational information rather than individualized tax advice; review IRS Publication 550 or speak with a qualified professional about your circumstances.
Common Mistakes Reading Probability of Profit
Errors That Distort the POP Decision
How This Calculator Helps You Decide
By converting the strike and premium into a breakeven, a required-move percentage, and a payout, the tool gives you the two halves of every probability decision side by side. You can quickly reject calls that demand an improbable move for a modest reward and focus on those where a reasonable move delivers a worthwhile payout. Running several strikes lets you watch probability and reward trade off against each other, so your entry rests on evidence about the move required rather than on the hope embedded in a low option price.
