Buy the call and the put at the same strike, and stop caring which way it goes.
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P&L at the selected date, priced with Black–Scholes. At 0 DTE the curve is pure intrinsic value. A tool, not a recommendation.
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What a Long Straddle is
Structure: Long 1 call + long 1 put, same strike and expiry. Usually bought at or near the money.
A long straddle buys both sides of the same strike. You pay one debit, and you profit if the stock moves far enough in either direction — the payoff curve is a V with a floor, not a ceiling.
The trade is a bet on the size of a move, not its direction. Two numbers decide it: the debit you paid, and the distance the stock has to travel before the curve crosses zero. Time works against you continuously, which is why the tool prices the position at the selected date and not just at expiry.
The numbers
Max profit
unlimited above the call side — the call has no strike ceiling
Max loss
total debit paid, if the stock finishes exactly at the strike
Breakeven
strike − total debit · strike + total debit
These are at-expiration formulas. The chart above prices the structure at the selected date with Black–Scholes — at 0 DTE the curve is pure intrinsic value. A tool, not a recommendation.
When traders use it
An event is coming and you expect a large move but have no idea which way.
Realised volatility may exceed what the options are pricing.
You want the position to be right about magnitude rather than direction.
What works against it
Time decay hits both legs at once. A stock that sits still bleeds the position.
Implied volatility falling after entry reduces the value of both legs before expiry.
The move has to be big: the breakevens are the strike plus and minus the whole debit.
Long Straddle questions
How far does the stock need to move to profit?
More than the total debit, in either direction. Pay $4.00 for the $100 straddle and the breakevens are $96 and $104 at expiration.
What is the maximum loss?
The debit you paid, and it occurs if the stock finishes exactly at the strike. Both options expire worthless there.
Why does the curve look better than the expiry payoff before expiration?
Because of remaining time value. Before expiry both options still carry extrinsic value, so the curve sits above the expiration V. Switch the time slider to 0 DTE to see the pure intrinsic payoff.
What is the main thing that kills a long straddle?
A stock that does nothing. Both legs decay, and the implied volatility that made the options expensive often falls once the event passes.
If it goes against you: common mitigations
Every entry below is a response traders commonly plan before entry, with what it actually costs. Which one is right depends on why you entered and what you now expect — that is a judgement the calculator cannot make for you, and none of this is advice.
Leg out of the winning side
Sell the option on the side the stock moved toward and keep the other one.
Pros: Realises the gain on the moved side and lowers the net cost of what remains.
Cons: What is left is a naked directional option that decays, and the move has already been paid for once.
Consider when: The move arrived quickly and you want to bank part of it.
Sell a further-out option against it
Write an out-of-the-money option above (or below) to bring in credit.
Pros: Reduces the cost basis and adds theta that now works for you.
Cons: Caps the very move the straddle was bought for.
Consider when: You still expect movement but not an unlimited one.
Take it off in halves
Close half the position at the first target and let the rest run.
Pros: Locks in a result and keeps exposure to a larger move.
Cons: Two sets of costs, and a reversal can still turn the remaining half red.
Consider when: The stock has moved enough that the position is well past the breakevens.
Close before the event
Exit the whole position while implied volatility is still elevated.
Pros: Avoids both the event gap and the volatility collapse that usually follows it.
Cons: You give up the move you were expecting, and the exit price already contains that expectation.
Consider when: You entered mainly for an event you no longer want to hold through.