Call Diagonal Spread Calculator

By Dennis Bosmans · Updated June 2026 · 2 min read · Risk disclaimer

A call diagonal buys a longer-dated call and sells a shorter-dated, higher-strike call against it. It is the structure behind the poor man’s covered call: leveraged, income-generating and multi-expiration.

Open the Call Diagonal Spread calculator →

Key characteristics

Buy a longer-dated (often in-the-money) call; sell a shorter-dated, higher-strike call.
Max loss = net debit paid; income comes from rolling the short call each cycle.
A capital-efficient stand-in for a covered call (the "poor man’s covered call").
Multi-expiration — handled automatically here.

How a call diagonal works

You buy a long-dated call as a cheaper substitute for 100 shares, then sell a shorter-dated call at a higher strike to collect premium — like a covered call, but on a call instead of stock. The two different strikes and expirations are what make it "diagonal".

Each cycle you let the short call expire (or roll it), keeping the premium and lowering the cost of the long call, while the long call gives you upside exposure for a fraction of the capital of owning shares.

Risks and management

Keep the short strike above your long strike so the spread can never invert into a guaranteed loss. The main risks are a sharp drop (the long call loses value) and a fall in implied volatility, which hurts the long-dated leg most.

If the stock rallies through the short strike, roll the short call up and out for more time rather than letting your long call get capped too early.

Worked example. A stock trades at $100. You buy the 120-day $90 call for $13 and sell the 30-day $105 call for $1.50, a $11.50 net debit ($1,150). If the stock drifts toward $105 as the short call expires worthless, you keep the $150 and still hold the long call — then sell another short call next cycle.

Calculate it live

Use the free OptionProfit Call Diagonal Spread 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.

Key takeaways

A long-dated call financed by selling shorter-dated calls.
The capital-efficient version of a covered call (PMCC).
Keep the short strike above the long strike; max loss = net debit.
Roll the short call up and out if the stock rallies through it.

Frequently asked questions

Is a call diagonal the same as a poor man’s covered call?

Effectively yes — a PMCC is a call diagonal where the long leg is a deep-in-the-money LEAPS used as a stock substitute.

What is the maximum I can lose?

The net debit you pay to open the diagonal — the long call defines and caps your risk.

Why two different expirations?

The short-dated call decays faster than the long-dated one, so you harvest that faster decay each cycle while keeping longer-term upside.

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