What is probability of profit?

POP is the modeled probability that an option position closes profitable at expiration. It's based on the option chain's implied volatility and the price distribution that implies.

Delta-based vs IV-based — which should I use?

Delta-based ((1 - |delta|)) is fast and matches what most brokers display. IV-based uses a lognormal distribution and is more accurate at extreme strikes or unusual DTEs. Run both and treat any meaningful gap as a signal to dig deeper.

Can a high-POP trade still be a bad trade?

Absolutely. POP only captures the probability of finishing profitable, not how much you stand to make versus lose. A 95% POP trade collecting $0.10 to risk $4.90 has terrible expectancy.

Which inputs do I need to trust?

Implied volatility is the touchiest input — it can change minute by minute. The calculator uses the IV you give it; if the chain's IV is stale or skewed, your POP will be too. Cross-check with the IV percentile calculator if you can.

Why is ATM POP roughly 50%?

An at-the-money option sits at the median of the price distribution priced into the chain. Half the scenarios end above, half below — so finishing on the profitable side lands right around 50%.

How does POP relate to expectancy?

Expectancy = POP × average win − (1 − POP) × average loss. POP is one input. The other half — your management discipline — determines whether the math actually plays out.

Free trader tools

Probability of Profit Calculator

Pick a method — delta-based for a quick estimate, IV-based for a sharper one — and the calculator returns the probability the trade is profitable at expiration. Both methods exist for a reason; using both is how serious option traders cross-check.

Probability of profit is the most-quoted, least-understood number on every option chain.

MindTrajour_PoP

Why high POP can still bleed money

Three reasons probability and expectancy are not the same.

POP is a snapshot at expiration

Most retail options never make it to expiration — they're closed at a profit target or rolled. POP doesn't speak to whether your management style turns paper edges into realized P&L.

High POP usually means low credit

The premium you collect compensates for the (small) loss probability. A 90% POP credit spread is fine — until two of the next ten trades hit max loss and wipe out the prior eight wins.

Delta is shorthand, not truth

Delta-based POP assumes a normal distribution and current implied volatility — both of which are approximations. Use the IV-based method as a sanity-check, not a single source of truth.

From estimate to evidence

POP is a forecast. Your journal is the receipt.

MindTrajour cross-references your historical POP estimates with realized P&L so you stop trusting the chain blindly.

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This table converts CRV directly into the minimum win rate (or PoP) required to break even. Use it as the bridge between trade structure and probability.

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IV Percentile + Theta Decay

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Iron Condor Calculator

Punch in your four strikes, the net credit, and the number of contracts. We give you back the max profit, max loss, both break-evens, and a payoff diagram that shows exactly where the trade lives or dies.

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Frequently asked questions

Everything you need to know before sizing your next trade.