Straddles and strangles are the two simplest ways to trade how much a price moves rather than which way. Both combine one call and one put on the same underlying with the same expiry. The difference is the strikes.
- A straddle uses the same strike for the call and the put, normally the at-the-money (ATM) strike nearest the current price.
- A strangle uses two different strikes: an out-of-the-money (OTM) call above the price and an OTM put below it.
Each can be bought (long) or sold (short). If the terms call, put, ATM and OTM are new, start with the straddle guide and the strike prices guide.
A worked example with NIFTY
Suppose NIFTY is at 25,000 with a week to expiry. Some illustrative prices:
| Option | Premium |
|---|---|
| 25,000 call (ATM) | ₹160 |
| 25,000 put (ATM) | ₹150 |
| 25,300 call (OTM) | ₹55 |
| 24,700 put (OTM) | ₹50 |
The 25,000 straddle costs ₹160 + ₹150 = ₹310. The 24,700 / 25,300 strangle costs ₹55 + ₹50 = ₹105, about a third as much.
Straddle breakevens = strike ± total premium; strangle breakevens = call strike + premium and put strike − premium
| Cost | Lower breakeven | Upper breakeven | Best case for a seller | |
|---|---|---|---|---|
| Straddle 25,000 | ₹310 | 24,690 | 25,310 | NIFTY ends exactly at 25,000 |
| Strangle 24,700 / 25,300 | ₹105 | 24,595 | 25,405 | NIFTY ends anywhere between 24,700 and 25,300 |
For a buyer at expiry, the straddle pays once NIFTY moves more than 310 points either way; the strangle needs more than 405 points. For a seller, the straddle collects ₹310 but starts losing at the same breakevens, while the strangle collects only ₹105 but keeps the full premium anywhere between the two strikes.
Outcomes at expiry, side by side
| NIFTY at expiry | Long straddle P&L | Long strangle P&L |
|---|---|---|
| 24,400 | +₹290 | +₹195 |
| 24,700 | −₹10 | −₹105 |
| 25,000 | −₹310 | −₹105 |
| 25,300 | −₹10 | −₹105 |
| 25,600 | +₹290 | +₹195 |
Figures are per unit; multiply by the lot size for a real position (check the current NIFTY lot size on NSE). Short positions have the opposite sign. Notice the shapes: the straddle has a sharp V with its worst point exactly at 25,000, while the strangle has a flat bottom between its two strikes. The payoff diagrams guide shows how to read these shapes.
Live: the ATM straddle and the strikes around it
The NIFTY ATM straddle is recorded every minute on ScreenerCharts. Here is today's:
Its current price is what a straddle buyer pays and a straddle seller collects right now. To build a strangle, look at the option chain below and pick an OTM call above the highlighted row and an OTM put below it:
Add the premiums of the two strikes you chose and compare the total with the straddle. The further apart the strikes, the cheaper the strangle and the bigger the move it needs.
How each reacts to time and volatility
- Time decay (theta). Both lose value as time passes. In rupees the straddle decays faster, because ATM options hold the most time value. As a percentage of its price, the strangle often decays faster near expiry, because OTM options can drop to almost zero.
- Volatility (vega). Both gain when implied volatility rises and lose when it falls. The straddle has more vega in rupee terms; the strangle can react more in percentage terms.
- Movement (gamma). The straddle responds immediately to a move because its strike is right at the price. The strangle needs the price to approach one of its strikes before it really comes alive.
When traders choose one or the other
- Long straddle: chosen when a large move is expected soon and the trader wants to profit from any meaningful move, accepting the higher cost. See long straddles before events.
- Long strangle: chosen for a cheaper bet on a very large move, accepting that most moderate moves will not pay.
- Short straddle: chosen by sellers who expect the price to stay close to the current level and want the largest premium; it needs active management.
- Short strangle: chosen by sellers who want a wider range and fewer adjustments, accepting a smaller credit. See the short strangle guide.
- Protected versions: adding a bought call and put further out turns a short straddle into an iron butterfly and a short strangle into an iron condor, capping the loss.
The straddle as a measure, the strangle as a trade
The ATM straddle price is widely used as the market's expected move: NIFTY ± the straddle gives the range options are pricing. Strangle sellers often place their strikes at or outside that range, which is why the two are often used together: the straddle tells you how big a move is priced, and the strangle is placed around it.
Compare the upper and lower ends of this range with the strikes you might use for a strangle. Strikes inside the range collect more but are more likely to be tested.
Managing the position after you enter
The two trades also differ once they are open. A short straddle starts losing on its first rupee of movement in either direction, because one leg is always moving into the money. Sellers usually manage it with a stop-loss on the combined premium (for example exiting if the ₹310 straddle rises to ₹400) or by shifting the strikes as the price moves; the straddle adjustment guide covers these methods.
A short strangle has a buffer. With NIFTY at 25,000 and strikes at 24,700 and 25,300, a 150-point move hurts less, because both options are still out of the money and keep decaying. Sellers often wait until the price approaches one strike before acting, then roll the threatened side further out or roll the safe side closer to collect more premium.
Margins differ too. Brokers ask for a margin on both naked short positions based on the risk of large moves; protected versions (iron butterfly, iron condor) need much less. Check the current margin for any combination on your broker's margin calculator before placing it. Buyers of either combination pay only the premium and cannot lose more than that.
Finally, think about exits before you enter. Long straddle and strangle buyers often take profits on a sharp move rather than waiting for expiry, because decay resumes once the move stalls. Sellers often book most of the premium early instead of holding for the last few rupees, which carry the most risk for the least reward.
Common mistakes
- Thinking the strangle is safer because it is cheaper. A short strangle still has unlimited risk; it just needs a bigger move to hurt.
- Choosing strangle strikes by premium alone. A strike that is "only ₹10" may be far less liquid and harder to exit.
- Buying either before a known event at inflated prices. Implied volatility usually falls straight after the event and can erase gains.
- Ignoring costs. Both use two legs to open and two to close; brokerage, taxes and spreads matter on small moves.