Calendar Spreads vs. Diagonal Spreads

What's the Difference Between Calendar Spreads and Diagonal Spreads?

Calendar spreads, time spreads, horizontal spreads, diagonal spreads - yikes!

What's the difference among all these anyway, and how critical is it to be able to articulate the differences?

It's super important - if you've decided to publish your own option trading encyclopedia.

I've done a little of that formal definition thing on option spreads here if you're interested, but on this page I just want to give a general overview and then make the case for the big picture.

In my view, the terminology itself is not as important as having a basic structural understanding of what spreads are, understanding why they exist, and learning what they can do for you.

Calendar Spread Quickie

If we're going to be super precise, a calendar spread involves being long an option (call or put) that expires farther out in time and being short the same kind of option (call or put) with an earlier expiration. And both options share the same strike price.

A diagonal spread is similar to a calendar spread with the only difference being that the strikes are different.

Here's a screenshot of what would officially be called a calendar spread (and you can click the image to enlarge it):

horizontal spread vs diagonal spread

It's also known as a horizontal spread - which makes sense. Since we're talking about the same strike price, you can simply draw a straight line between the near dated option and the long dated option.

If you understand how a horizontal spread gets its name, then you can easily deduce why a diagonal spread is called what it is - placing two options side by side with different expiries AND different strikes results in a diagonal line drawn between them, not a horizontal one.

Limitations of Terminology

I generally refer to any spread with a longer dated long option and a nearer dated short option as a calendar spread - whether those long and short options strike price or not.

If I want to distinguish between spreads with the same strike and those with different strikes, then I'll refer to them as either horizontal spreads or diagonal spreads.

But really, I don't just sit around thinking about calendar spreads and worrying about whether the Options Industry Council approves of the use of my terminology.

Because at the end of the day, terminology doesn't matter, and the purpose of option trading isn't about using the correct jargon so we all appear sophisticated to outsiders - it's to control risk and leverage our returns.

If we're only hung up on encyclopedic definitions and conventional understanding of options, we're totally going to miss bigger picture and larger opportunity blend strategies and customize entirely new strategies and approaches.

When we need to give our strategies their own name because we've created strains and variations that haven't been defined by the CBOE, then we know we're on the right track.

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Warren Buffett Zero Cost Basis Portfolio Current Equity Holdings:

KO - 125 shares
KMI - 100 shares
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Open Market Purchase Price: $20,071.83

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