How to use this calculator
- Enter the stock's current price and the number of contracts.
- Enter the Call strike and Call premium for the call you're buying.
- Enter the Put strike and Put premium - set both strikes equal for a straddle, apart for a strangle.
- Read the result: net debit (your max loss), both breakevens, and how far the stock must move to profit.
What it tells you: how big a move - up or down - the stock needs before a long straddle or strangle pays off, and what you risk to find out.
How this calculator works
A long straddle or strangle is a bet on movement, not direction. You buy a call and buy a put on the same stock and expiration; if the stock makes a big enough move either way, one leg gains more than the pair cost. Same strike for both is a straddle; a higher call strike and lower put strike is a strangle.
Enter both strikes and both premiums. The calculator adds the premiums into a net debit — which is also your max loss — and finds the two breakevens: the call strike plus the debit above, the put strike minus the debit below. It then shows how far the stock must move from its current price, in percent, to reach each breakeven, so you can judge whether the expected move justifies the cost.
Profit is unlimited on the upside and large but capped on the downside (a stock can only fall to zero). The payoff diagram is the tell-tale V: it bottoms at the max loss between the strikes and rises on both sides.
Straddle vs strangle
A straddle buys the call and put at the same (usually at-the-money) strike. It costs the most, but its breakevens are the tightest, so it needs the smallest move to start working.
A strangle buys an out-of-the-money call and an out-of-the-money put. It is cheaper — less premium at risk — but the wider strikes push the breakevens further out, so the stock has to move more before either leg pays. Use a straddle when you expect a sharp move and want the tighter breakevens; a strangle when you want a lower-cost bet and expect a really large move.
What about selling a straddle or strangle?
This calculator is for the long version — where you buy the call and the put. We deliberately don't offer a short (selling) calculator, and the reason is risk. Selling a straddle or strangle means selling a naked call and a naked put at the same time: the premium you collect is capped, but the loss is not. A naked short call carries theoretically unlimited loss if the stock keeps climbing, and the short put adds the whole way down to zero. One sharp move — an earnings surprise, a buyout, an overnight gap — can cost many times the credit you took in. That open-ended risk is the opposite of the defined-risk approach this site is built on, so we don't publish a tool that makes it look routine.
Want defined-risk income from a stock you expect to stay range-bound? The Iron Condor Calculator and Iron Butterfly Calculator do that same job — sell premium, profit from a quiet stock — but with the loss capped by long wings, so there is a floor under the risk. If there's enough demand for a dedicated short strangle calculator, we'll look at adding one — tell us.
Worked example
A fixed, hypothetical illustration — not live market data.
A hypothetical stock trades at $100. You buy the $100 call for $4.00 and the $100 put for $4.00 — an at-the-money straddle for a net debit of $8.00 per share.
- Net debit: $8.00 × 100 = $800 per contract (your max loss).
- Upper breakeven: $100 + $8.00 = $108.
- Lower breakeven: $100 − $8.00 = $92.
- Move needed: the stock must finish above $108 or below $92 — about an 8% move either way — just to break even.
- At $120: the call is worth $20, the put $0; minus the $8 debit that is +$1,200.
Common mistakes
- Buying before earnings and getting IV-crushed. Implied volatility is highest right before a known event; after it, IV collapses and can deflate both options even if the stock moves as expected. The move has to beat that crush.
- Underestimating the move you need. The breakevens are the strikes plus the full combined premium — often a larger move than people expect. A quiet stock bleeds the debit away.
- Fighting time decay. Theta works against you on both legs and accelerates near expiration. A long straddle is a race between the move and the clock.
- Confusing the two structures. A strangle is cheaper than a straddle but needs a bigger move; the lower cost is not a free lunch.
- Treating “unlimited profit” as easy. The upside is unlimited in theory, but the position still has to clear a breakeven first.
Frequently asked questions
What is a straddle, and how is it different from a strangle?
Both are long-volatility trades: you buy a call and a put on the same stock and expiration, betting on a big move in either direction. A straddle uses the same strike for both (usually at the money), so it costs more but has the tightest breakevens. A strangle buys an out-of-the-money call above and an out-of-the-money put below, so it is cheaper but needs a bigger move to pay off. This calculator handles both — set the two strikes equal for a straddle, or apart for a strangle.
What is the maximum loss on a long straddle or strangle?
The full net debit you paid — the call premium plus the put premium, times 100 per contract. You lose all of it only if the stock finishes between the strikes at expiration (for a straddle, exactly at the strike), where both options expire worthless. It is a defined-risk trade: you can never lose more than what you paid to open it.
How are the breakevens calculated?
There are two. The upper breakeven is the call strike plus the total net debit per share; the lower breakeven is the put strike minus the total net debit per share. The stock has to finish beyond one of those two prices for the trade to profit at expiration. The calculator also shows how far — in percent — the stock must move from its current price to reach each one.
What is the profit potential on a long straddle?
Profit is unlimited on the upside, because the long call keeps gaining as the stock rises. On the downside it is large but capped, because the stock can only fall to zero — at which point the long put is worth its full strike. In both directions your profit is the option’s value at expiration minus the net debit you paid.
When does buying a straddle or strangle actually make money?
Only when the stock moves far enough, fast enough, to clear a breakeven before time decay erodes the premium — and without implied volatility collapsing. The classic trap is buying a straddle right before earnings: the stock can move exactly as expected, yet the trade still loses because the post-event “IV crush” deflates both options. Check whether the expected move is large relative to the cost, and avoid buying when implied volatility is already high.
When should I use a straddle or strangle?
When you expect a big move but genuinely do not know the direction - you buy a call and a put (same strike for a straddle, wider strikes for a cheaper strangle) and profit if the stock moves far enough either way. The key is buying it when implied volatility is low relative to the move you expect, often before a catalyst the market is underpricing. Skip it when IV is already rich: you are paying for two options, and a stock that does not move far enough, or an IV crush after the event, hands you a loss on both legs even when something happens. You need a move bigger than the premium, not just a move.
Related tools and guides
Check whether the move is even likely with the Expected Move Calculator, and avoid overpaying by checking the IV Rank Calculator first — long volatility hates high IV.
Want just one leg? Price a single call or put in the Long Call & Long Put Calculator. Prefer to sell a strangle instead? Compare in Strangle vs Straddle, map any structure with the Payoff Diagram Builder, and look up any term in the options glossary.
Educational tool only. Nothing here is financial advice. Long options lose value to time decay and falling volatility, and most expire worthless — size positions accordingly.