Double Calendar: Two Time Machines, Wider Range
You expect the stock to drift sideways but are not sure it will pin one exact strike. A double calendar runs two calendar spreads side by side, one centered below the stock and one above it, widening the range where time decay works in your favor.
- Exactly what you build: two calendar spreads, one on puts below and one on calls above
- The payoff: wider profit range than a single calendar, defined risk
- Your numbers: total debit paid, the wider profit zone, rolling mechanics
- When a double calendar fits and how it compares to a single calendar
A double calendar is two calendar spreads stitched together. One calendar uses put strikes set below the current price, the other uses call strikes set above it. Both sell near-term time and buy longer-dated time at their respective strikes. The result is a wider range where you benefit from the near-term options decaying faster than the long-dated ones, at the cost of a bigger debit than a single calendar.
What You Actually Do
Apple trades at $200. You expect it to drift between $190 and $210 over the next month. You run a put calendar: sell one 1-month $190 put for $2 a share, $200, buy one 2-month $190 put for $3 a share, $300. You also run a call calendar: sell one 1-month $210 call for $2 a share, $200, buy one 2-month $210 call for $3 a share, $300.
Your net debit: ($300 minus $200) plus ($300 minus $200) = $200 paid upfront. If Apple finishes anywhere between $190 and $210 at the near-term expiration, both short legs expire worthless or cheap, and your long-dated legs retain value, giving you a profit across a much wider band than a single calendar centered at $200 alone.
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 instead of a single peak. Between $190 and $210, both calendars are working in your favor, giving you a broad zone of profit instead of the single sweet spot a one-strike calendar offers. Move well past either strike and the near-term leg on that side goes deep ITM, eating into the long-dated leg's cushion, and losses grow.
The Widening: One Strike Becomes Two
A double calendar is a single calendar's answer to uncertainty about the exact pin.
A single calendar bets the stock lands near one strike. A double calendar hedges that bet by using two strikes, a put calendar below and a call calendar above, so you profit across a band instead of a point. The cost is roughly double the capital and double the legs to manage, but the payoff is a meaningfully wider window where time decay works for you.
The math: think of it as buying insurance against being slightly wrong about where the stock pins, in exchange for giving up some of the concentrated profit a single, well-placed calendar would deliver if you nailed the exact strike.
When a Double Calendar Fits
- You expect the stock to drift within a range, not pin one price
- IV is elevated on the near-term legs
- You want a wider profit zone than a single calendar
- You expect a sharp move outside the range
- You have high conviction on one exact strike (use a single calendar)
- The extra capital and legs are not worth the wider range to you
A double calendar is for the trader who wants time-decay income but is not confident enough about the exact pin to bet on a single strike. It is not for traders with a precise price target or those unwilling to manage four legs.
A Worked Example
Walk through three scenarios: you paid $200 net for the double calendar.
Apple stays at $200. Both short legs expire worthless or near-worthless, and both long-dated legs retain solid value. Net profit: roughly $250, similar to running two smaller calendars simultaneously.
Apple drifts to $195. Still inside the $190-$210 plateau. The put calendar is closer to its peak profit, the call calendar has widened its distance a bit but still holds value. Net profit: roughly $200, still solidly positive.
Apple spikes to $225. Well outside the range. The call calendar's near-term leg is deep ITM, and the long-dated leg's cushion is not enough to offset it fully. Net result: roughly -$150, a partial loss as the move outpaced the range.
That is the double calendar: a wider band of profit than a single calendar, at the cost of more capital and more moving parts.
- A double calendar is two calendar spreads, a put calendar below the stock and a call calendar above it.
- Profit plateau is wider than a single calendar, spanning between the two strikes.
- Max loss is the total net debit; sharp moves outside the range erode the long-dated legs' cushion.
- It fits sideways-drift traders who are not confident enough to pin one exact strike.
Pop Quiz
Two quick checks. Pick an answer and the explanation shows up right away.
Why would a trader choose a double calendar over a single calendar spread?
A single calendar profits most if the stock pins one exact strike. A double calendar spreads that bet across two strikes, widening the range where you profit, at a higher cost.
You run a double calendar with a put calendar at $190 and a call calendar at $210. What happens if the stock finishes at $200?
$200 sits inside the $190-$210 plateau, so both calendars are working in your favor even though neither strike is exactly at the stock price.
Bottom Line
A double calendar widens a single calendar spread's narrow sweet spot into a broad plateau, using a put calendar below the stock and a call calendar above it. It costs more and requires managing four legs, but it fits traders who expect sideways drift without confidence in the exact pin. Reach for it when IV favors selling near-term premium and you want a wider window for time decay to work in your favor. Avoid it when you expect a move sharp enough to blow past both strikes.