What changes when you pick a different strike?
What is the strike of an option?
The strike is the price at which the underlying changes hands if the option is exercised. It is fixed in the contract and does not move during the option’s life, apart from adjustments for corporate actions. The distance between strike and current price drives premium, probability and the position’s whole risk profile.
Four numbers move together
Moving a call one strike up the chain changes four things at once. The premium falls, because less of the likely price range lies above the strike. The break-even rises: for a long call it is the strike plus the premium paid. The required move, the distance from today’s price to that break-even, grows. And delta falls, so the position gains less for each euro the stock rises. For puts the mirror image happens moving down the chain. None of the four can be chosen on its own.
Premium against required move
The lower premium is paid for with a larger move. A call further out of the money costs less and loses less if nothing happens, yet the stock has to travel further before the trade earns anything at expiration. Set the required move beside the expected move the market prices in for the same expiration: a break-even beyond it is a bet on more movement than the option price itself assumes. A payoff calculator for option legs shows the result at expiration; run it once per strike, because legs entered together are added up as one position.
The seller’s side of the same chain
For a seller the trade-off runs the other way. Selling a call or put further from the price brings in less premium but leaves more room before the short strike is reached, and the lower delta means smaller swings in the position’s value. The probability-of-profit calculator, which models a single short call or short put, shows how the estimated chance of keeping the premium changes when you move the short strike, from the price, IV and days to expiration you enter.
The common misreading
The cheaper strike is often taken for the cheaper bet. A 32 € option risks less per contract than a 286 € one, but it needs a much larger move to pay off and expires worthless far more often. Buying several cheap contracts to match the cost of one nearer the money multiplies exactly that exposure. The price per contract measures what you can lose, not how likely the trade is to work; compare strikes by break-even and required move, not by premium alone.
Worked example
Hypothetical numbers for illustration, not a market quote and not a recommendation.
An example stock trades at 100 €, with 30 days to expiration and an implied volatility of 25 %. With rates at zero, the 100 € call costs 2.86 €, the 105 € call 1.08 € and the 110 € call 0.32 €: 286 €, 108 € and 32 € per contract. Their deltas are 0.51, 0.26 and 0.10.
The break-evens are 102.86 €, 106.08 € and 110.32 €, so the stock must rise 2.86 %, 6.08 % or 10.32 % by expiration. As a model value (lognormal, rate zero), the chance of finishing above break-even is about 33 %, 20 % and 8 %. Fees are ignored.
Strategies where the term matters
- Covered Call — Are you willing to hand over the shares at the call strike - even if they keep running afterwards?
- Bull Put Spread — Do you want a credit against an obligation - or would you rather pay a debit?
- Long Call Butterfly — Do you have a precise price target - not just a direction?
Calculators for this term
Track it in your journal
Related terms
Every term in one place: the options glossary.
This material is general information about option strategies, written for a general audience. It is not investment advice, not a recommendation, and not financial analysis. Options can lose their entire value, and uncovered positions can lose more than the amount committed. Anything said about tax is general in nature and is no substitute for professional tax advice. Last reviewed: 2026-08-06.