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Options Blueprint

Calendars & diagonals

Same stock, different dates. Why time itself has a price.

Advanced Time / volatility

Important: educational only. Options Blueprint is general financial education, not advice or a recommendation to use any strategy. Options involve significant risk and are not suitable for all investors. Some strategies can lose more than the premium received or paid, and some have unlimited potential losses. Before buying or selling an option, investors must receive and read the OCC’s Characteristics and Risks of Standardized Options. All “Stock XYZ” examples are made up and ignore fees and taxes. Read the full risk disclosure.
Approximate numbers on this page. Calendars and diagonals mix expiration dates, so their maximum gain and breakevens can’t be pinned to one exact number the way vertical spreads can. They depend on what the longer-dated option is worth later, which depends on volatility. The figures below are hypothetical and labeled “about.”

Calendar spread (time spread)

Goal Profit from time decay when you expect the stock to stay near one price for now.

Setup: Sell the 30-day XYZ $50 call ($2.50) and buy a 90-day $50 call (hypothetically $4.50). Net debit = $2.00 ($200). Results are shown at expiration, per 100-share contract, ignoring fees, dividends and taxes.

  • XYZ right at $50 at the 30-day expiration: the short call expires worthless, and the long call (now with 60 days left) might be worth about $3.50 (hypothetical). Profit ≈ ($3.50 − $2.00) × 100 = about +$150.
  • XYZ moves far away in either direction: both calls end up worth about the same (both near $0, or both mostly intrinsic value), and you lose most of the $200.
Approximate payoff of an XYZ $50 calendar spread at the 30-day expiration (hypothetical model)A rounded hump, not straight lines: about plus $150 if XYZ is right at $50 when the short call expires, falling off on both sides toward about minus $200 if XYZ moves far away. The exact shape and breakevens depend on volatility.$30$40$50$60$70−$2,000−$1,000$0+$1,000+$2,000XYZ price at expirationProfit / loss per contractHypothetical · ignores feesAbout +$150 near $50Toward about −$200Toward about −$200Approximate curve · depends on volatility
Calendar spread at the 30-day expiration: an approximate curve, not straight lines. The curve is drawn with a simple option-pricing model at one constant volatility, set so the 60-day $50 call is worth about $3.50 with XYZ at $50. In real markets volatility changes, and the shape and breakevens would change with it.
Calendar spread numbers (approximate)
At expirationPer sharePer contract (×100)
Max gainNot fixed. Highest when XYZ is at the strike at the first expirationAbout +$150 here
Max lossAbout the $2.00 debit, if both legs are closed together at the first expirationAbout −$200
BreakevensTwo points, one below and one above $50. They depend on volatility and need an options calculator

Diagonal spread

Goal A calendar with different strikes. It is often described as a lower-cost cousin of a covered call.

Setup: Buy a 180-day XYZ $40 call (hypothetically $11.00: $10 intrinsic + $1 extrinsic) and sell the 30-day $55 call ($1.00). Net debit = $10.00 ($1,000), compared with $5,000 to buy 100 shares. Results are shown at expiration, per 100-share contract, ignoring fees, dividends and taxes.

  • XYZ ends at $55 at the 30-day expiration: the short call expires worthless, and the long call is worth at least $15 (intrinsic) plus any time value left. Profit ≈ at least +$500.
  • XYZ falls a lot: the long call can lose most of its value. The maximum loss is about the $1,000 debit.
Diagonal spread floor at the 30-day expiration: long 180-day $40 call ($11.00), short 30-day $55 call ($1.00)Conservative floor line that assumes the long call has no time value left: minus $1,000 at $40 or below, rising one for one through $0 at $50, and plus $500 at $55 or above. Any time value left on the long call would lift the line, so the real breakeven would be a bit under $50.$30$40$50$60$70−$2,000−$1,000$0+$1,000+$2,000XYZ price at expirationProfit / loss per contractHypothetical · ignores feesAbout −$1,000Floor breakeven $50At least +$500Floor case: no time value left on the long call
Diagonal spread at the 30-day expiration, drawn as a conservative floor: it assumes the long $40 call has no time value left. With zero time value left, the long call is worth XYZ − $40, so the floor breakeven is $40 + $10 = $50. Any time value left pushes the real breakeven a bit under $50 and lifts the line.
Diagonal spread numbers (approximate)
At expirationPer sharePer contract (×100)
Max gainNot fixed. At least $15 − $10 = $5.00 with XYZ at or above $55At least +$500
Max lossAbout the $10.00 debitAbout −$1,000
BreakevenA bit under $50, depending on the long call’s leftover time value

Key risks (both)

  • Volatility changes (vega) matter a lot, because the longer-dated option is worth more or less as expectations change.
  • Early assignment of the short call, especially near dividends. If assigned, people usually sell the long call rather than exercise it, to keep its time value.
  • Big moves in either direction.
  • They are harder to model, so beginners often misjudge them.

What can go wrong: volatility drops

You open the calendar when the market expects big moves. A week later, expectations calm down. Even with XYZ still near $50, the 90-day call you own can lose value faster than the 30-day call you sold, so the “about +$150” can shrink or turn into a loss.

Who tends to study them

Advanced learners who understand theta and vega and want to see why time itself has a price.

Related glossary terms

Related Options Blueprint topic

  • Calendars & Diagonals: Trading Time Itself

We’ll cover these topics in the future. See all Options Blueprint topics.

Important: please read

Educational only. Options Blueprint is general financial education. It is not financial, investment, tax or legal advice, and it is not a recommendation to buy or sell any security or to use any strategy. Nothing here is personalized to you, and viewing it doesn’t create an advisory relationship.

Options are not suitable for everyone. Options are complex and carry significant risk. They can lose money quickly, including the full amount you paid. Some strategies can lose more than the premium received or paid, and some (such as selling uncovered calls) have unlimited potential losses. Assignment can happen at any time before expiration on most stock and ETF options, and prices can gap sharply on news.

Hypothetical examples only. “Stock XYZ” and all prices, premiums and results on this page are made up for illustration. They ignore commissions, fees, bid/ask spreads, dividends, interest, margin requirements and taxes, all of which affect real results. No real tickers are used, and nothing here is a trade recommendation.

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