Double Diagonal: Two Diagonals for Range-Bound Income
You expect the stock to drift sideways and want income with longer-dated protection built in. A double diagonal runs a put diagonal below the current price and a call diagonal above it, similar to a double calendar but with different strikes on the near and far legs for extra flexibility.
- Exactly what you build: a put diagonal below the stock and a call diagonal above it
- The payoff: range-bound income with longer-dated protection, defined risk
- Your numbers: net debit paid, the profit zone shaped by both diagonals
- When a double diagonal fits and how it compares to a double calendar
A double diagonal takes the double calendar's two-sided structure and adds strike flexibility to each side. Instead of using the same strike for both the near-term and long-dated leg of each spread (a calendar), a diagonal uses a different strike for each, giving you an extra lever to shape the profit zone or improve your protection. Run one diagonal below the stock with puts and one above it with calls, and you get a range-bound income trade with longer-dated options cushioning both sides.
What You Actually Do
Apple trades at $200. You expect it to drift between $190 and $210. On the put side, you sell one 1-month $190 put for $2 a share, $200, and buy one 2-month $185 put for $2.50 a share, $250, a diagonal since the strikes differ. On the call side, you sell one 1-month $210 call for $2 a share, $200, and buy one 2-month $215 call for $2.50 a share, $250, also a diagonal.
Your net debit: ($250 minus $200) plus ($250 minus $200) = $100 paid upfront. The long legs sit further from the money than the short legs, which lowers their cost compared to a same-strike double calendar, while still offering longer-dated cushioning if the stock drifts within the range defined by your short strikes.
The Payoff, Drawn
Drag the slider to see how you do at different ending prices for Apple (at the near-term expiration).
The shape is a wide plateau similar to a double calendar, but the extra strike spacing on the long legs typically produces a slightly wider or more forgiving zone on the edges, since the long options are further from the money and cushion sharper moves a bit differently than same-strike calendars do.
The Extra Lever: Strike Spacing on Both Legs
A double diagonal is a double calendar with one more dial to turn.
A double calendar locks each spread's long and short leg to the same strike, leaving only the choice of where to center each calendar. A double diagonal frees up the long leg's strike independently, letting you decide how far out to buy protection relative to where you sell the near-term option. This can lower the cost of the long legs (since further OTM options are cheaper) or shape the profit zone differently, at the cost of one more variable to manage on each side.
The math: think of a diagonal as a calendar spread with a built-in directional tilt on each leg, controllable by how far apart you set the two strikes. Two of these, mirrored above and below the stock, form the double diagonal.
When a Double Diagonal Fits
- You expect the stock to drift sideways within a range
- You want strike flexibility on your near and far legs
- You want longer-dated protection built into the structure
- You expect a move sharp enough to blow past both sides
- You prefer the simplicity of a same-strike double calendar
- The extra strike decisions add more complexity than you want
A double diagonal is for the trader who wants the double calendar's wide, sideways-income profile but also wants the extra control that comes from choosing independent strikes on the long and short legs of each side. It is not for traders who prefer the simpler, single-variable structure of a same-strike calendar.
A Worked Example
Walk through three scenarios: you paid $100 net for the double diagonal.
Apple stays at $200. Both short legs decay toward worthless while the longer-dated, further-out long legs retain solid value. Net profit: roughly $300, reflecting the plateau built by both diagonals.
Apple drifts to $193. Still inside the plateau, closer to the put side's short strike. Profit narrows slightly on that side but remains positive: roughly $220.
Apple spikes to $220. Outside the range on the call side. The near-term $210 call is well ITM, and even with the long-dated $215 call's cushion, the position posts a loss: roughly -$130.
That is the double diagonal: a wide, flexible income plateau, shaped by four strikes instead of two, for traders who want more control over how the position responds to a drifting stock.
- A double diagonal is a put diagonal below the stock and a call diagonal above it, generalizing the double calendar.
- Different strikes on near and far legs give more control over cost and the shape of the profit zone.
- Max loss is the net debit; sharp moves outside the plateau erode the long-dated legs' cushion.
- It fits sideways-drift traders who want strike flexibility beyond a simple same-strike double calendar.
Pop Quiz
Two quick checks. Pick an answer and the explanation shows up right away.
What is the key structural difference between a double diagonal and a double calendar?
Both use four legs and both have defined risk. The difference is strike selection: a diagonal's long and short legs sit at different strikes, while a calendar's sit at the same strike.
Why might a trader choose a double diagonal over a double calendar?
Freeing the long leg's strike from the short leg's strike gives you an extra lever to shape cost and the profit zone, at the cost of one more decision to manage on each side.
Bottom Line
A double diagonal generalizes the double calendar by letting the long and short legs of each spread sit at different strikes, giving more control over cost and the shape of the profit plateau. It fits sideways-drift traders who want that extra flexibility and are comfortable managing four independently chosen strikes. Reach for it when you want the wide, range-bound income profile of a double calendar with more room to fine-tune the structure. Avoid it if you would rather keep things simple with a same-strike double calendar or expect a move sharp enough to blow past both sides.