Call Ratio Spread Calculator

Call Ratio Spread at a glance

How a call ratio spread works

A call ratio spread is a bull call spread with one extra short call. The first short call pays for part of the long call, as in a vertical spread, and the second brings in more premium, often enough to make the trade nearly free or a small credit. That extra call is uncovered, however. Above the short strike you are net short one call, so the position behaves like a naked short call on a strong rally.

At expiration the payoff rises from the long strike to a peak at the short strike, where the long call is worth the full strike width and both short calls expire worthless. Below the long strike, everything expires worthless and you keep any credit or lose any debit. Above the short strike, the extra short call loses one dollar for every dollar the stock rises, so profit falls until it crosses the upper breakeven and then turns into a loss with no limit.

Before expiration the trade is net short premium: time decay helps while the stock sits between the strikes, and the peak at the short strike only fully forms near expiration. Rising implied volatility hurts because you are short two options, especially when the stock is near or above the short strike. A sudden rally early in the trade can show a loss even below the upper breakeven, because the two short calls gain value faster than the single long call.

Call Ratio Spread example with real numbers

With the stock at $100, implied volatility at 30%, a 4.1% risk free rate and no dividend, you would buy 1 100 call (32 days) at $3.73, sell 2 105 calls (32 days) at $1.78. That is a net debit of $17. At expiration a maximum profit of $483 and a maximum loss of unlimited, with breakevens at $100.17 and $109.83. The lognormal chance of profit is 35%.

These are theoretical American option prices from the Bjerksund and Stensland model, not live quotes. Load any ticker in the call ratio spread calculator above to run the same math on real market prices.

When to use a call ratio spread

• You expect a modest rise to a specific price by expiration but not a strong rally.
• Implied volatility is high and you expect it to fall, which helps the two short calls.
• You want a bullish spread for little or no cost and accept the risk of the uncovered call.
• You have approval for uncovered calls and the margin to support one naked short call.

Max profit, max loss and breakeven

Maximum profit

Short strike minus long strike, plus the net credit or minus the net debit, times 100. You earn it when the stock closes exactly at the short strike at expiration.

Maximum loss

Unlimited on the upside: the loss equals the stock price minus the upper breakeven, times 100, and keeps growing as the stock rises. On the downside, the most you can lose is the net debit, if any, times 100.

Breakeven

Upper breakeven equals the short strike plus the strike width, plus the net credit or minus the net debit. A lower breakeven exists only for a debit trade and equals the long strike plus the net debit; a credit trade has no loss on the downside.

Call Ratio Spread Greeks

• Delta: Delta at entry can be slightly positive or slightly negative depending on how far away the short strike is, and it turns firmly negative as the stock rallies past the short strike.
• Gamma: Gamma is negative because you are short two options against one long, and it is most negative near the short strike as expiration approaches.
• Theta: Theta is positive, since the two short calls lose more time value each day than the single long call.
• Vega: Vega is negative, so falling implied volatility helps and a volatility spike hurts, especially when the stock is near the short strike.

See the live numbers for your position in the Greeks tab of the calculator, or explore a single option in the options Greeks calculator.

Early exercise and assignment risk

The call ratio spread includes one naked short call, which raises the stakes on American style assignment. If the stock rallies above the short strike ahead of an ex dividend date, either short call may be assigned the day before the ex date when the dividend exceeds its remaining time value. Assignment on one call leaves you short 100 shares that your long call can cover. Assignment on both leaves you short 200 shares with only one long call, so 100 shares are uncovered short stock, and you owe the dividend on every share you are short on the ex date.

Brokers require uncovered call approval and margin for the extra short call, and that margin can climb quickly in a rally. Pin risk is a special concern at expiration: if the stock closes near the short strike, where max profit sits, you may not know whether zero, one or both short calls will be assigned. Closing the position on expiration day, or at least buying back the short calls, prevents an unexpected short stock position over the weekend.

The calculator's Early exercise risk tab flags short legs that are likely to be assigned. For a single option, use the early exercise calculator or read how early exercise and assignment work.

Pros and cons

How to manage a call ratio spread

• Set an adjustment point below the upper breakeven, such as buying a further out of the money call to convert the trade into a call butterfly or broken wing butterfly.
• Take profits if the stock reaches the short strike well before expiration, since the peak is hard to hold.
• Before ex dividend dates, close or roll any in the money short calls with little time value left.
• Close the position before expiration if the stock is near the short strike to avoid pin risk.

Call Ratio Spread FAQ

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Educational tool, not financial advice. Calculations are theoretical and depend on your inputs; real fills, fees, early assignment and dividends can change results. Options involve risk and are not suitable for every investor.