strategy comparison
Calendar Spread vs Double Calendar
A double calendar is two calendars — a put side and a call side — at different strikes.
Side by side
Same eight dimensions for both structures — outlook, risk, Greeks, capital, complexity, and the IV environment each one wants.
| Dimension | Calendar Spread | Double Calendar |
|---|---|---|
| Outlook | neutral | neutral |
| Max profit | Variable - depends on IV and time | Variable - depends on IV and time |
| Max loss | Net debit paid | Net debit paid |
| Breakevens | Varies with IV changes | Varies with strikes and IV changes |
| Greeks exposure | Positive theta from the short front leg; net long vega from the longer back leg. | Twin positive-theta engines; net long vega from the long back legs. |
| Capital / margin | Net debit; no margin. | Net debit for both calendars; risk capped at the debit paid. |
| Complexity | advanced | expert |
| Best IV environment | Low front-month IV with a stable or rising back month — and no near-term event. | Low near-term IV with an expected IV expansion into the back month. |
Payoff at a glance
Illustrative P/L at expiration for both structures at a $100 underlying. Exact strikes and premiums are on each strategy's guide.
The verdict
When to choose which
A double calendar is two calendars — a put side and a call side — at different strikes. Choose the single calendar when your thesis is time decay at one strike with a simpler risk profile; choose the double calendar when you want a tent-shaped profit zone between two strikes and more vega from two long back legs. Single calendar for a level; double calendar for a range.
Frequently asked questions
Why run two calendars instead of one?
One calendar protects one strike; a double calendar builds a profit plateau between a lower put and an upper call — closer to a condor's tent than a butterfly's pin.
Which carries more vega?
The double calendar — two long back-month legs instead of one. It is the structure of choice when you expect IV to expand into the back month.
Which is riskier around earnings?
Both are exposed: front-month shorts love the crush, back-month longs hate it. The double calendar doubles both effects and doubles the roll decisions after the event.