Straddle/Strangle Calculator
Last updated: 27 June 2026
Reviewed by Gavin Meiring, Lead research and primary author · Doctoral Candidate (Corporate Governance) · Research and drafting assisted by AI
- A straddle is a call and a put at the same strike and expiry: you profit from a big move in either direction, and the only way to lose is if the stock goes nowhere.
- A strangle is the wider version — the call strike sits above the put strike, making it cheaper to buy but requiring an even bigger move to profit.
- Straddles predate listed options: brokers dealing in puts and calls in the first half of the 20th century routinely offered them to clients betting on big moves — and both trades are really bets on volatility, bought before events like earnings or sold when calm is expected.
Straddle and Strangle Calculator
A straddle and strangle calculator helps options traders work out the cost, break-even points, and maximum profit or loss of these two volatility strategies. Both strategies involve buying (or selling) a call and a put on the same underlying asset and expiry date. They are used by traders who want to profit from large price movements without predicting the direction.
How to Use the Straddle and Strangle Calculator
- Select whether you are modelling a straddle (same strike for call and put) or a strangle (different strikes).
- Enter the underlying asset's current price.
- For a straddle, enter the single strike price. For a strangle, enter both the call strike and put strike.
- Input the premium (price) for both the call option and the put option.
- The calculator outputs total cost, upper and lower break-even prices, and the profit or loss at any given expiry price.
The Formula
Long Straddle (buying both options at the same strike):
Total Cost = Call Premium plus Put Premium
Upper Break-Even = Strike Price plus Total Cost Lower Break-Even = Strike Price minus Total Cost
The straddle profits if the underlying moves more than the total premium paid in either direction by expiry.
Long Strangle (buying out-of-the-money call and put at different strikes):
Total Cost = Call Premium plus Put Premium
Upper Break-Even = Call Strike plus Total Cost Lower Break-Even = Put Strike minus Total Cost
Maximum Loss for both long strategies = Total premium paid (if the underlying expires exactly between the strikes at expiry).
For short straddles and strangles (selling both options), maximum profit equals premium received, and losses are theoretically unlimited to the upside and substantial to the downside.
Real-World Example
You believe a company reporting earnings next week will move sharply but are unsure of the direction. The stock is trading at £50.
You buy a straddle: purchase the £50 call for £2.50 and the £50 put for £2.00.
Total Cost = £2.50 plus £2.00 = £4.50 per share (or £450 for one contract of 100 shares).
Upper Break-Even = £50 plus £4.50 = £54.50 Lower Break-Even = £50 minus £4.50 = £45.50
If the stock rises to £60 at expiry: call is worth £10, put expires worthless. Profit = £10 minus £4.50 = £5.50 per share.
If the stock falls to £42 at expiry: put is worth £8, call expires worthless. Profit = £8 minus £4.50 = £3.50 per share.
If the stock stays at £50 at expiry: both options expire worthless. Loss = £4.50 per share (maximum loss).
Now compare to a strangle. You buy the £52 call for £1.80 and the £48 put for £1.60.
Total Cost = £3.40. Upper Break-Even = £52 plus £3.40 = £55.40 Lower Break-Even = £48 minus £3.40 = £44.60
The strangle costs less but requires a larger price movement to be profitable.
Payoff at expiry
Both strategies from the example above, marked to a range of expiry prices. Per share and per contract of 100 shares.
| Expiry price | Straddle per share | Straddle per contract | Strangle per share | Strangle per contract |
|---|---|---|---|---|
| £40.00 | +£5.50 | +£550 | +£4.60 | +£460 |
| £42.00 | +£3.50 | +£350 | +£2.60 | +£260 |
| £44.60 | +£0.90 | +£90 | £0.00 | £0 |
| £45.00 | +£0.50 | +£50 | -£0.40 | -£40 |
| £45.50 | £0.00 | £0 | -£0.90 | -£90 |
| £50.00 | -£4.50 | -£450 | -£3.40 | -£340 |
| £52.00 | -£2.50 | -£250 | -£3.40 | -£340 |
| £54.50 | £0.00 | £0 | -£0.90 | -£90 |
| £55.00 | +£0.50 | +£50 | -£0.40 | -£40 |
| £55.40 | +£0.90 | +£90 | £0.00 | £0 |
| £60.00 | +£5.50 | +£550 | +£4.60 | +£460 |
| £65.00 | +£10.50 | +£1,050 | +£9.60 | +£960 |
Past both strikes the two strategies move together, one for one with the underlying, and the strangle trails the straddle by exactly £0.90. That figure is the £2.00 gap between the two call strikes less the £1.10 the strangle saves on premium.
Break-even distance
| Strategy | Total cost | Upper break-even | Lower break-even | Move needed |
|---|---|---|---|---|
| Straddle | £4.50 | £54.50 | £45.50 | 9.0% either way |
| Strangle | £3.40 | £55.40 | £44.60 | 10.8% either way |
The strangle costs £1.10 less and needs 1.8 percentage points more movement to pay. Both figures are set at entry and neither moves afterwards, which is the practical advantage of pricing a volatility trade this way before you take it.
Implied moves
Dividing the premium by the spot price gives the move the market has priced in. The straddle costs £4.50 against a £50.00 share, which is 9.0 percent. The strangle costs £3.40, which is 6.8 percent of the same share price, but its break-even sits 10.8 percent away.
That gap is the trap in the cheaper-looking trade. The strangle's premium is smaller in percentage terms and its break-even is further out, because the strikes sit away from spot and the money has to travel to them before either option carries any value. Compare the two on break-even distance, not on premium.
Contracts compared
One contract covers 100 shares, the multiplier used throughout this page. The straddle costs £450 per contract and the strangle costs £340, so the strangle frees £110 of capital for the same underlying and the same expiry date.
The trade is exact: £110 less at risk, and 1.8 percentage points more movement needed before either side pays. That is the whole decision.
The loss plateau
The two strategies lose their maximum in different shapes. The straddle loses its worst figure, £4.50, at exactly £50.00, and the loss narrows as the expiry price moves away in either direction. The strangle loses its maximum of £3.40 at every expiry price from £48.00 to £52.00, which is a plateau rather than a single point.
That plateau is the structural difference. A strangle tolerates a small move without getting any worse, and a straddle does not. A trader who expects the price to sit near the current level but is unsure exactly where would rather hold the strangle, while a trader who expects a large move from a specific level would rather hold the straddle.
When to Use Each Strategy
A long straddle is typically used when you expect a large move from a catalyst such as earnings, a central bank decision, or a regulatory ruling, but are unsure of the direction. The key risk is that implied volatility may be high before the event (known as "IV crush"), meaning the options lose value rapidly after the event even if the price moves significantly.
A long strangle costs less than a straddle because both options are out of the money, but the underlying must move further to generate a profit. It is appropriate when you expect a very large move or when the straddle is too expensive relative to the likely move.
Short straddles and strangles are selling volatility strategies. They profit when the underlying stays range-bound and when implied volatility declines. The risk is significant: losses on a short straddle are unlimited to the upside and very large to the downside, so these strategies are generally reserved for experienced traders.
Frequently Asked Questions
What is implied volatility and why does it matter for straddles? Implied volatility (IV) is the market's expectation of future price movement embedded in option prices. When IV is high, options are expensive, which makes straddles and strangles costly to enter. After a volatility event (like earnings), IV often collapses, which is called "IV crush." This can cause long straddles to lose value even if the stock moves in the expected direction, if the move is smaller than what was priced in.
What is the maximum loss on a long straddle? The maximum loss is the total premium paid for both options. This occurs if the underlying asset's price is exactly at the strike price (for a straddle) at expiry, so both options expire worthless. For a strangle, maximum loss occurs if the price is between the two strikes at expiry.
How is a straddle different from a strangle? A straddle uses the same strike price for both the call and the put, making it more expensive but profitable with a smaller underlying price move. A strangle uses different strike prices (typically out of the money), making it cheaper but requiring a larger price move to be profitable. Both profit from large moves in either direction.
Can straddles and strangles be traded on any market? These strategies require a liquid options market for the underlying asset. They are most commonly traded on individual stocks, stock indices, ETFs, and major currency pairs. The strategies require that both call and put options exist at the needed strike prices and expiry dates with sufficient liquidity. Illiquid options have wide bid-ask spreads that eat into profitability.
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