Short Strangle Calculator

A short strangle sells a put below the current price and a call above it on the same expiry. It collects premium on both sides and profits if the stock stays between the strikes through expiry. The maximum gain is the total credit; the loss is open-ended beyond either strike, so brokers require margin and a high permission level.

When it is used

Traders sell strangles when implied volatility is high relative to the moves they expect, on stocks or indexes they believe will range. The wider the strikes the more often it works and the less it pays. It is the undefined-risk cousin of the Iron Condor, which buys wings for protection; the grid makes the premium cost of those wings visible.

How it makes and loses money

Time decay and falling implied volatility are the engine, and both strengthen toward expiry. A move toward either strike costs money, more so early in the trade and more so when it comes with a volatility spike. Beyond the strikes the loss grows one for one with the stock, without a floor.

What to check in the grid

Look at both edges of the grid for the growing losses. Then compare the row at a short strike on an early column with the same row at expiry: a touch of the strike weeks out is a real loss, while at expiry it is still full profit, which is why strangles are managed early.