Double Calendar Calculator

By Yojana Mandon · Updated June 2026 · 2 min read · Risk disclaimer

A double calendar sells a near-term put and call and buys longer-dated put and call at the same strikes — a put calendar below the price and a call calendar above it. It builds a wide profit "tent" that pays off if the stock stays between the two strikes while the near-term options decay.

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Key characteristics

• A put calendar below + a call calendar above: sell near-term, buy longer-dated.
• Profits if the stock stays between the two strikes into the near expiration.
• Wider profit range than a single calendar, and long back-month volatility.
• Net debit; defined risk, with the loss limited to what you paid.

When to use a double calendar

Use it when you expect a quiet, range-bound stock over the near term but want a wider profit zone than a single calendar gives. Placing the two strikes around the current price spreads the "tent" so the position tolerates more drift before it loses.

Because you are long the back-month options, the trade also benefits from a rise in implied volatility — useful ahead of a slow build-up to an event, when near-term decay works for you and back-month vol can expand.

Risks and management

The enemies are a big move and a volatility crush. If the stock runs past either strike, or implied volatility falls sharply, the back-month options lose value and the position can give back its debit — the maximum loss.

Because the legs have different expirations, the payoff at the near expiration is a curved tent, not straight lines. Many traders close or roll the near-term options as they decay, then re-sell against the back-month longs.

On the Greeks, the Double Calendar is close to vega-neutral, so implied-volatility shifts have little net effect.

Managing the trade and common mistakes

Experienced traders typically close a double calendar when it has gained 25–40 % of the debit paid, rather than riding it to the front-month expiration. Because the position holds two separate time spreads — a call calendar and a put calendar — profit can arrive from either side independently: an IV expansion, gradual theta decay with price staying between the two strikes, or a slow drift toward one of the strikes can all create harvestable gains early. When the underlying moves decisively toward one strike, the threatened calendar loses value faster than the opposite one gains it; the standard response is to roll the challenged side to a closer strike or to the next expiration cycle, keeping the overall structure balanced. Cut the entire position if the underlying breaks outside both strikes with momentum, because beyond that point neither spread has meaningful recovery potential.

The mistake beginners make most often is confusing the double calendar's wider tent with a forgiving trade. The two strikes create a broader profit zone than a single calendar, but that zone is still bounded, and any sustained directional move beyond either strike results in losses on both sides simultaneously. A second common error is opening the structure when implied volatility is already elevated: since you are a net buyer of options, you need IV to stay flat or expand after entry — paying inflated premiums for both calendars compresses the edge severely. Many beginners also fail to check that both spreads are liquid independently; a wide bid-ask on just one leg can turn a theoretically attractive setup into an unprofitable one after slippage. Always price each of the four legs individually before committing.

Because the structure involves four option contracts across two expirations, assignment and expiration logistics are more complex than in a single calendar. Both short front-month legs are assignment-eligible if they go deep in-the-money; if one is assigned and the other is not, the resulting position — short stock on one side, a bare long back-month option on the other — is asymmetric and must be addressed immediately. Near front-month expiration, if the underlying is sitting close to one of the strikes, the delta of that short option accelerates sharply; holding the position through the final hours creates binary risk that most traders prefer to avoid. Liquidity degrades further out in the expiration chain, so favor expirations with healthy open interest on all four legs. Closing a few days early almost always costs less than managing an expiration-day surprise.

Calculate it live

Use the free OptionProfit Double Calendar calculator to load a live option chain, build the trade, and instantly see the payoff chart, breakevens, probability of profit, Greeks and a Monte Carlo simulation of outcomes.

Frequently asked questions

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