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Key Takeaways
- A ratio spread combines unequal option quantities at different strikes with the same option type and expiration.
- A front ratio sells more contracts than it buys; a backspread buys more than it sells.
- The zero-cost 100/110 call front ratio earns $1,000 at $110 and breaks even again at $120.
- Above $120, each $1 stock rise adds $100 to the example’s expiration loss.
- Model the exact quantities to compare payoff regions, current Greeks and target-date values.
What is a ratio spread?
A ratio spread is an options strategy that buys and sells unequal quantities of the same option type at different strikes in one expiration, such as one long call against two short calls. A front ratio sells more options than it buys, so the unpaired short option creates a loss that grows as the stock moves past the far breakeven.
All legs share the underlying, option type, expiration and contract deliverable. A 1:2 structure pairs one contract at one strike with two contracts at another. Other ratios include 2:3 and 3:5.
A backspread buys more contracts than it sells. The side holding the extra contract sets the risk, so confirm it on the order ticket before you send the order.
A call front ratio buys one lower-strike call and sells two higher-strike calls. It combines a bull call spread with an additional short call. Reversing all three contracts creates a call backspread.
Formula
1x2 call front-ratio P/L per share = max(S_T − K_low, 0) − 2 × max(S_T − K_high, 0) − net debit- K_high exceeds K_low and all calls share one expiration.
- For a zero-cost spread, maximum profit is K_high − K_low and the upper breakeven is K_high + (K_high − K_low).
Zero-cost call ratio spread example
XYZ trades at $100. A trader buys one 100 call for $5.00 and sells two 110 calls for $2.50 each with the same expiration, creating a zero-cost 1×2 call front ratio.
- Net premium = $5.00 − (2 × $2.50) = $0.00 before costs
- At $110, maximum profit = ($110 − $100) × 100 = $1,000
- Upper breakeven = $110 + ($110 − $100) = $120
- At $130, loss = [$30 − (2 × $20)] × 100 = −$1,000
The long call helps through $110, but above that price two short calls overwhelm it, leaving one uncapped net short call equivalent.
The example buys one 100 call for $5.00 and sells two 110 calls for $2.50 each. The net option premium is zero. For one standard package, expiration profit is zero at or below $100, rises to $1,000 at $110, and returns to zero at $120.
Above $120, each $1 increase in stock price adds $100 to the loss. At $130, the long call contributes $3,000 of intrinsic value and the two short calls require $4,000, producing a $1,000 loss.
Entry credit lifts the entire profit curve. Entry debit lowers it. Calculate both strikes, every breakeven and the outer price regions using the exact quantity of each contract.
Payoff at expiration
Illustrative figures from this page's example, priced by the InsiderFinance options profit calculator. Probability assumes 25% volatility, a 4% rate and 45 days to expiration.
- Max Profit
- $1,000.00
- Max Loss
- Unlimited
- Break-Even
- $120.00
Interactive payoff loads as you reach it
Load this setup on live SPY options. Move the strikes and scrub to any date.
Build This StrategyFront ratio spread vs ratio backspread
A put front ratio buys one higher-strike put and sells two lower-strike puts. Its expiration peak sits at the lower strike, while the extra short put creates increasing loss as stock falls beyond the lower breakeven. Evaluate the stock-at-zero outcome to calculate that tail’s limit.
A ratio backspread reverses the quantities. Its maximum expiration loss occurs at the strike holding the extra long options, and the payoff improves beyond that strike in the direction of those options.
For either structure, add each option’s signed delta, gamma, theta and vega. Compare those values at the stock prices and dates in the plan.
How to plan and manage a ratio spread
Use price structure, gamma exposure and options flow to select the price regions to evaluate. Compare the short-strike payoff with the outcomes beyond breakeven and the broker’s buying-power requirement.
Use a combined order with a net price limit. For physically settled options, map the share transactions from each exercise or assignment and include any remaining contracts in the position. Building the exact ratio in the options profit calculator shows the entry price, maximum-profit location, breakevens, current value and target-date outcomes before the package is chosen.
Risks and limitations of ratio spreads
- Set the upside exit before entry. A call front ratio has no fixed maximum loss. Above the $120 upper breakeven each $1 rise adds $100 to the expiration loss, so the example loses $1,000 at $130 and more beyond it.
- Set the short strike at your price target. The best result needs the stock at the short strike at expiration. The zero-cost example earns $1,000 only at $110 and nothing at or below $100.
- Size a put front ratio from the stock-at-zero outcome. Its loss grows as the stock falls past the lower breakeven and reaches its largest value at a zero stock price.
- Size from the margin. The zero-cost example still ties up the broker’s requirement on the unpaired short call, so a $0 entry commits real capital.
- Recalculate the position after any assignment. Each short option can be assigned on American-style contracts. One assignment in a 1:2 position leaves the other short and the long option open.
Bottom line
This zero-cost 1×2 earns its peak with the stock at 110, the short strike. Past the far breakeven the extra short call loses like stock, so size it from that loss and the margin it requires rather than from the entry price.
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Sources and Further Reading
How entries are sourced, calculated and updated: editorial methodology.