Vertical Spread Width Selection Guide

Summary

Spread width—the difference between your two strike prices—is a critical but often overlooked decision. It determines your capital at risk, potential reward, probability of profit, and how the trade behaves throughout its life. This guide provides practical rules for choosing width based on your goals.

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Most discussions about vertical spreads focus on which direction to trade and what delta to sell. But how far apart your strikes sit matters just as much. A $2-wide and a $20-wide spread on the same stock with the same short strike will behave completely differently.

How Width Affects Your Trade

Wider spreads:

Higher max profit (more room between strikes for value to accumulate)

Higher max loss (more capital at risk)

Lower premium as a percentage of risk (on credit spreads)

Greater sensitivity to stock movement

Better absolute dollar returns per contract

Narrower spreads:

Lower max profit

Lower max loss

Higher premium as a percentage of risk (on credit spreads)

Less sensitivity to stock movement

More contracts needed to reach dollar profit targets

Width by Stock Price

A sensible starting framework ties width to the underlying stock's price:

| Stock Price | Suggested Width | Example | $20-$50$1-$2.50$45/$47.50 spread $50-$150$2.50-$5$100/$105 spread $150-$300$5-$10$250/$260 spread $300-$500$10-$15$400/$415 spread | $500+ | $10-$25 | $520/$540 spread |

These widths generally represent 2-5% of the stock price, which provides a balance between meaningful premium and manageable risk.

Width for Credit Spreads

On credit spreads, width determines your risk-to-reward ratio. Consider a bull put spread with a $5.00 short put:

$5-wide spread: Credit $1.50, risk $3.50. Return on risk: 43%. You need the trade to work less than half the time to break even.

$10-wide spread: Credit $1.50, risk $8.50. Return on risk: 18%. You need a much higher win rate to be profitable.

$2.50-wide spread: Credit $0.90, risk $1.60. Return on risk: 56%. Great ratio, but you need many contracts for meaningful dollar returns.

Narrower spreads generally offer better percentage returns on credit spreads because the credit collected doesn't decrease proportionally as the width narrows. The long option you're buying is closer to the short option, so it costs relatively more—but the credit remains substantial.

Width for Debit Spreads

On debit spreads, wider is often better for risk-reward, but costs more. A bull call spread example:

$5-wide: Costs $2.80, max profit $2.20. Reward-to-risk: 0.79:1

$10-wide: Costs $4.20, max profit $5.80. Reward-to-risk: 1.38:1

$20-wide: Costs $6.50, max profit $13.50. Reward-to-risk: 2.08:1

Wider debit spreads have better reward-to-risk ratios because the short option's premium becomes a smaller fraction of the spread's value. The trade-off is that the stock needs a larger move for the wide spread to reach max profit.

Account Size Considerations

Your account size should influence width selection:

Small accounts ($5,000-$25,000): Stick to $2.50-$5 widths. This keeps max loss per contract at $150-$400, allowing you to risk 2-3% of your account without oversizing.

Medium accounts ($25,000-$100,000): $5-$10 widths work well. You can handle $350-$800 max loss per contract while maintaining room for diversification.

Large accounts ($100,000+): $10-$25 widths are appropriate. Narrow spreads on expensive underlyings become cumbersome when you need 20+ contracts to make meaningful returns.

The Practical Test

Before finalizing width, ask these questions:

Can I afford the max loss? If max loss makes you anxious, the spread is too wide or you have too many contracts.

Is the premium worth the effort? If your credit is $0.30 on a $5-wide spread, commissions eat your profits. Go narrower or choose a different trade.

Does the width align with technical levels? Ideally, both your short and long strikes sit at technically significant prices.

OptionsPilot shows you the risk-reward profile for different strike combinations, making it easy to visualize how width affects your potential outcomes before entering a trade.