Double Diagonal Calculator

Time & DiagonalneutralDefined Risk

Combine bullish and bearish diagonals by selling near-term OTM options and buying farther-dated wings.

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What Is a Double Diagonal?

A double diagonal sells a near-term out-of-the-money call and put, then buys a longer-dated call and put at strikes further out of the money as protective wings. It combines a bullish put diagonal below the stock with a bearish call diagonal above it. The structure resembles an iron condor with the wings moved to a later expiration, which is why it is sometimes called a diagonal iron condor.

The short options decay quickly because they are close to expiration, while the long wings decay slowly and retain value after the front month expires. Depending on strikes and the volatility term structure the trade can be opened for a small debit or a small credit. Unlike an iron condor the position is usually long vega, because the longer-dated wings carry more volatility sensitivity than the short options.

At the front-month expiration the payoff curve has two humps over the short strikes with a modest dip in between, similar to a double calendar but with a wider plateau because the wings are further out. Beyond the short strikes the loss grows until it is capped by the wing width plus the net debit, or minus the net credit, less whatever time value remains in the wings.

Setup

BUY1x OTM3 PUT

SELL1x OTM1 PUT

SELL1x OTM1 CALL

BUY1x OTM3 CALL

Max Profit

Depends on time decay, IV, and price near the short strikes

Max Loss

Net debit paid or defined wing risk

Breakeven

Depends on diagonal widths and time value

Double Diagonal Example

XYZ trades at $100. You sell the $105 call expiring in 30 days for $1.30 and the $95 put expiring in 30 days for $1.20, collecting $2.50. You buy the $115 call expiring in 90 days for $1.60 and the $85 put expiring in 90 days for $1.50, paying $3.10. The net debit is $0.60 per share, or $60 per double diagonal. Each side is $10 wide. At the front-month expiration the wings will have 60 days remaining.

Stock at expiration	Result
$100 (unchanged)	Both short options expire worthless and you keep the $250. The long $115 call is assumed worth $0.70 and the long $85 put $0.60, or $1.30 total. Position value is $130 against a $60 cost, a gain of $70.
$105	The short $105 call finishes at the money and both short options expire worthless. The long $115 call, now $10.00 out of the money, is assumed worth $1.40 and the long $85 put $0.20. Position value is $160, a gain of $100, the approximate maximum. The result at $95 mirrors this.
$110	The short $105 call is $5.00 in the money and costs $500 to close. The long $115 call is assumed worth $2.60 and the long $85 put $0.10. Net value is $270 minus $500, or −$230, and after the $60 debit the loss is $290.
$120	The short $105 call is $15.00 in the money and costs $1,500 to close. The long $115 call is assumed worth $6.80 ($5.00 intrinsic plus $1.80 time value) and the put $0.05. Net value is $685 minus $1,500, or −$815, and after the $60 debit the loss is $875.

Maximum profit is roughly $100 if XYZ finishes at either short strike at the front-month expiration. If all four options shared the same expiration the maximum loss would be the $10 wing width plus the $0.60 debit, or $1,060; at the front-month expiration the wing still holds some time value, so the realized loss on a large move is slightly smaller. Approximate breakevens are near $94 and $106.

When to Use a Double Diagonal

You expect the stock to stay in a range through the front expiration but want protection that outlives the short options.
Implied volatility is low to moderate and you expect it to stay flat or rise, since the longer-dated wings benefit from higher volatility.
The front-month implied volatility is higher than the back-month volatility, which makes the short options rich relative to the wings and can turn the trade into a credit.
You want to sell premium repeatedly against the same wings, rolling the short strangle each month while the long wings stay in place.
Typical entries sell 30 to 45 day options around 25 to 30 delta and buy 60 to 120 day wings 5 to 10 percent further out of the money.

Risks to Understand

A large move through a short strike produces a loss that grows until the wing strike, and because the wing is in a later month its intrinsic value does not fully offset the short option until the stock passes the wing strike.
The reward-to-risk ratio is unfavorable. In the example the peak gain is around $100 against a potential loss approaching $1,000, so a high win rate is essential.
A drop in implied volatility reduces the value of the long wings more than the short options, which can produce a loss even inside the range.
If a short option finishes in the money and is assigned, you hold a stock position hedged only by a wing that is $10 away and in a different month.
Four legs in two expirations mean substantial bid-ask cost and a complex greeks profile that shifts as the stock approaches either short strike.

Managing the Trade

Close or roll the short strangle before the front-month expiration. Many traders buy it back once it has lost 50 percent of its value and sell the next month against the same wings.
If the stock approaches one short strike, roll that short option out to the next month, or roll the untested side closer to collect more credit and shift the breakeven.
Set a loss limit at one and a half to two times the maximum expected gain. Because the tail loss is large, waiting for the wing to protect you is expensive.
If implied volatility rises sharply, the wings gain value and the position may hit its profit target early. Take the gain rather than waiting for the short options to decay.
Close the wings when they have 30 to 45 days left or when you have stopped selling short options against them. Holding them alone is a long strangle with fast time decay.

Double Diagonal FAQs

What is a double diagonal spread?: It sells a near-term out-of-the-money call and put and buys a longer-dated call and put at strikes further out of the money. The short options provide income and the long wings define the risk. It behaves like an iron condor whose protective wings expire later than the short options.
What is the difference between a double diagonal and an iron condor?: An iron condor has all four legs in the same expiration and is short vega, so it profits when volatility falls. A double diagonal moves the wings to a later expiration, which makes it long vega and lets you sell several rounds of short options against the same wings. The double diagonal usually costs a small debit while the condor collects a credit.
How do you calculate max loss on a double diagonal?: Treat it like an iron condor: the wing width on the wider side plus any net debit paid, or minus any net credit received, multiplied by 100. In the example that is $10 plus $0.60, or $1,060. The actual loss at the front-month expiration is slightly less because the wing still has time value.
Is a double diagonal long or short vega?: Usually long vega, because the longer-dated wings have more volatility sensitivity than the front-month short options. That makes it a better fit than an iron condor when implied volatility is low and expected to rise. If volatility falls sharply after entry the wings lose value and the position can show a loss inside the range.
What happens when the short options in a double diagonal expire?: If they expire worthless you keep the premium and are left holding the two long wings, which is a long strangle in the back month. You can sell a new short strangle in the next expiration against those wings, close the wings, or hold them if you expect a large move.
Can I lose more than the net debit on a double diagonal?: Yes. Unlike a calendar spread the long options are at different strikes from the short ones, so a large move produces a loss up to the wing width plus the debit. The net debit is only the loss if the stock finishes between the short strikes and the wings lose all their value.

Related Strategies

Double Calendar Iron Condor Calendar Spread

What Is a Double Diagonal?

Double Diagonal Example

Stock at expiration	Result
$100 (unchanged)	Both short options expire worthless and you keep the $250. The long $115 call is assumed worth $0.70 and the long $85 put $0.60, or $1.30 total. Position value is $130 against a $60 cost, a gain of $70.
$105	The short $105 call finishes at the money and both short options expire worthless. The long $115 call, now $10.00 out of the money, is assumed worth $1.40 and the long $85 put $0.20. Position value is $160, a gain of $100, the approximate maximum. The result at $95 mirrors this.
$110	The short $105 call is $5.00 in the money and costs $500 to close. The long $115 call is assumed worth $2.60 and the long $85 put $0.10. Net value is $270 minus $500, or −$230, and after the $60 debit the loss is $290.
$120	The short $105 call is $15.00 in the money and costs $1,500 to close. The long $115 call is assumed worth $6.80 ($5.00 intrinsic plus $1.80 time value) and the put $0.05. Net value is $685 minus $1,500, or −$815, and after the $60 debit the loss is $875.

When to Use a Double Diagonal

You expect the stock to stay in a range through the front expiration but want protection that outlives the short options.

Implied volatility is low to moderate and you expect it to stay flat or rise, since the longer-dated wings benefit from higher volatility.

The front-month implied volatility is higher than the back-month volatility, which makes the short options rich relative to the wings and can turn the trade into a credit.

You want to sell premium repeatedly against the same wings, rolling the short strangle each month while the long wings stay in place.

Typical entries sell 30 to 45 day options around 25 to 30 delta and buy 60 to 120 day wings 5 to 10 percent further out of the money.

Risks to Understand

A large move through a short strike produces a loss that grows until the wing strike, and because the wing is in a later month its intrinsic value does not fully offset the short option until the stock passes the wing strike.

The reward-to-risk ratio is unfavorable. In the example the peak gain is around $100 against a potential loss approaching $1,000, so a high win rate is essential.

A drop in implied volatility reduces the value of the long wings more than the short options, which can produce a loss even inside the range.

If a short option finishes in the money and is assigned, you hold a stock position hedged only by a wing that is $10 away and in a different month.

Four legs in two expirations mean substantial bid-ask cost and a complex greeks profile that shifts as the stock approaches either short strike.

Managing the Trade

Close or roll the short strangle before the front-month expiration. Many traders buy it back once it has lost 50 percent of its value and sell the next month against the same wings.

If the stock approaches one short strike, roll that short option out to the next month, or roll the untested side closer to collect more credit and shift the breakeven.

Set a loss limit at one and a half to two times the maximum expected gain. Because the tail loss is large, waiting for the wing to protect you is expensive.

If implied volatility rises sharply, the wings gain value and the position may hit its profit target early. Take the gain rather than waiting for the short options to decay.

Close the wings when they have 30 to 45 days left or when you have stopped selling short options against them. Holding them alone is a long strangle with fast time decay.

Double Diagonal FAQs

What is a double diagonal spread?

It sells a near-term out-of-the-money call and put and buys a longer-dated call and put at strikes further out of the money. The short options provide income and the long wings define the risk. It behaves like an iron condor whose protective wings expire later than the short options.

What is the difference between a double diagonal and an iron condor?

An iron condor has all four legs in the same expiration and is short vega, so it profits when volatility falls. A double diagonal moves the wings to a later expiration, which makes it long vega and lets you sell several rounds of short options against the same wings. The double diagonal usually costs a small debit while the condor collects a credit.

How do you calculate max loss on a double diagonal?

Treat it like an iron condor: the wing width on the wider side plus any net debit paid, or minus any net credit received, multiplied by 100. In the example that is $10 plus $0.60, or $1,060. The actual loss at the front-month expiration is slightly less because the wing still has time value.

Is a double diagonal long or short vega?

Usually long vega, because the longer-dated wings have more volatility sensitivity than the front-month short options. That makes it a better fit than an iron condor when implied volatility is low and expected to rise. If volatility falls sharply after entry the wings lose value and the position can show a loss inside the range.

What happens when the short options in a double diagonal expire?

If they expire worthless you keep the premium and are left holding the two long wings, which is a long strangle in the back month. You can sell a new short strangle in the next expiration against those wings, close the wings, or hold them if you expect a large move.

Can I lose more than the net debit on a double diagonal?

Yes. Unlike a calendar spread the long options are at different strikes from the short ones, so a large move produces a loss up to the wing width plus the debit. The net debit is only the loss if the stock finishes between the short strikes and the wings lose all their value.