A butterfly spread is a limited-risk, limited-reward options strategy that profits when the underlying stock stays close to a specific price at expiration. Traders use it when they expect low volatility and want to define both their maximum gain and maximum loss before entering the trade.

This guide covers how the long call butterfly works, walks through a real-number example, explains when the strategy makes sense, and shows you how to model any butterfly setup with the butterfly spread calculator before you place a single order.

What Is a Butterfly Spread?

A butterfly spread combines three options at three different strike prices, all with the same expiration date. The standard long call butterfly uses the following structure:

• Buy one call at a lower strike (ITM or ATM)
• Sell two calls at a middle strike (ATM or slightly OTM)
• Buy one call at a higher strike (OTM)

The two short calls at the middle strike fund the two long calls at the outer strikes. The result is a net debit trade: you pay a small amount upfront, and your maximum loss is limited to that premium paid.

The strategy gets its name from the shape of its payoff diagram. When you chart profit and loss across a range of stock prices, the curve forms a shape that resembles butterfly wings: a peak at the middle strike where profit is highest, tapering down toward zero as the stock moves away from the center.

Butterfly Spread Payoff: Maximum Profit, Maximum Loss, and Breakeven Points

Every butterfly spread has three key numbers traders calculate before entering the trade.

Maximum profit occurs when the stock closes exactly at the middle strike at expiration. At that point, both short calls expire worthless and the lower long call is deep in the money. The maximum profit equals the spread width (distance between the lower and middle strikes) minus the net debit paid, multiplied by 100.

Maximum loss is the net debit paid for the spread. This happens when the stock closes at or below the lower strike or at or above the upper strike at expiration, causing all three legs to expire worthless or fully offset each other.

Two breakeven points exist on either side of the middle strike. The lower breakeven equals the lower strike plus the net debit. The upper breakeven equals the upper strike minus the net debit.

Use the butterfly spread calculator to calculate all three figures instantly from your actual strike prices and premiums.

Long Call Butterfly Example with Real Numbers

Say a stock is trading at $100 and you expect it to stay near that level through expiration in 30 days. You structure a long call butterfly as follows:

• Buy 1 call at the $95 strike for $6.50
• Sell 2 calls at the $100 strike for $3.50 each ($7.00 total credit)
• Buy 1 call at the $105 strike for $1.25

Net debit = $6.50 + $1.25 – $7.00 = $0.75 per share, or $75 per contract set.

Working through the outcomes at expiration:

• Maximum profit: $5.00 spread width – $0.75 debit = $4.25 per share ($425 total) if the stock closes exactly at $100
• Maximum loss: $0.75 per share ($75 total) if the stock closes at or below $95 or at or above $105
• Lower breakeven: $95.00 + $0.75 = $95.75
• Upper breakeven: $105.00 – $0.75 = $104.25

The profit-to-loss ratio is 5.67:1 ($425 max gain vs $75 max loss). That ratio only fully materializes if the stock closes at exactly the middle strike, which is why many butterfly traders aim to capture a portion of the maximum gain rather than hold through expiration hoping for a perfect outcome.

Long Put Butterfly: The Same Structure with Puts

A long put butterfly follows the same logic using put options:

• Buy one put at a higher strike (ITM)
• Sell two puts at the middle strike (ATM)
• Buy one put at a lower strike (OTM)

The payoff profile is nearly identical to the long call butterfly when using equidistant strikes. The choice between calls and puts often comes down to pricing: traders typically select whichever version offers a lower net debit after comparing the two. The butterfly spread calculator handles both structures.

When to Use a Butterfly Spread

The butterfly spread works best in specific conditions. It is not a general-purpose strategy; it works well when you have a strong view on where the stock will be at expiration, not just a directional bias.

Low implied volatility environment. When implied volatility is high, option premiums are more expensive, which raises the cost of the debit and narrows the potential profit margin. Butterfly spreads tend to cost less and offer better risk/reward ratios when IV is moderate to low.

Rangebound stock near a key level. The strategy profits from the stock sitting near the middle strike at expiration. Technical traders often center the butterfly at a support/resistance level, a moving average, or a recent closing price cluster where the stock has spent time consolidating.

Approaching expiration with theta working in your favor. As expiration approaches, time decay accelerates the profitability of the short calls at the middle strike. Butterfly spreads placed 20 to 45 days before expiration can benefit from this theta acceleration in the final two weeks.

Defined-risk requirement. Traders who need to know their exact maximum loss before entering a position often prefer butterfly spreads over naked short options. The debit paid is the absolute worst case regardless of how far the stock moves.

Butterfly Spread vs. Related Strategies

The butterfly spread is part of a family of neutral, rangebound options strategies. Understanding where it fits helps traders choose the right tool for a given market environment.

Compared to an iron condor, the butterfly uses a narrower profit zone but can offer a higher maximum profit as a percentage of the premium at risk. The iron condor sells options at two separate spreads to create a wider tent of potential profit, while the butterfly focuses on a single middle strike. Traders who want a tighter, higher-conviction bet on one price often prefer the butterfly; those who want a wider, more forgiving range often prefer the iron condor.

Compared to an iron butterfly, the long call butterfly is a debit strategy (you pay a premium upfront) while the iron butterfly is a credit strategy (you collect premium upfront). The iron butterfly has a larger maximum loss if the stock moves significantly in either direction, while the long butterfly caps the loss at the net debit paid.

The option spread calculator covers the vertical spread building blocks that make up butterfly positions, which is useful if you want to analyze individual legs before combining them into a full butterfly.

How to Use the Butterfly Spread Calculator

The butterfly spread calculator takes your three strike prices, the premiums paid or received for each leg, and the contract quantity, then instantly returns:

• Net debit for the full spread
• Maximum profit and the exact price at which it occurs
• Maximum loss
• Both breakeven points
• P&L at any stock price across a full payoff diagram

Enter the strikes and premiums from your broker’s option chain before placing the trade. This takes about 30 seconds and gives you the complete risk profile before you commit any capital.

Frequently Asked Questions

What is the maximum profit on a butterfly spread?
The maximum profit on a long butterfly spread equals the spread width (distance between the lower and middle strikes) minus the net debit paid, multiplied by 100 per contract set. It is realized when the underlying closes exactly at the middle strike at expiration.

What is the maximum loss on a butterfly spread?
The maximum loss is the net debit paid to enter the trade. This loss occurs when the underlying closes at or below the lower strike, or at or above the upper strike, at expiration.

How many legs does a butterfly spread have?
A standard long call butterfly has three legs and four total contracts: one long call at the lower strike, two short calls at the middle strike, and one long call at the upper strike. The structure uses a 1-2-1 ratio.

Is a butterfly spread bullish or bearish?
A standard butterfly spread is a neutral strategy. It profits when the underlying stays near the middle strike at expiration. Traders who want a directional tilt can shift the middle strike above or below the current price, but the core structure is designed for a neutral to rangebound outlook.

How does a butterfly spread differ from a condor spread?
A butterfly spread uses three strikes, with the middle strike shared between the two short legs. A condor spread uses four distinct strikes with separate inner short strikes, creating a wider flat profit zone. The condor generally offers a higher probability of achieving some profit, while the butterfly concentrates its maximum profit at a single price point.

When do traders close a butterfly spread early?
Some traders set a profit target of 50 to 75 percent of the maximum profit and close early to lock in gains and eliminate expiration-week assignment risk. Closing early also frees up capital for the next trade rather than leaving it tied up through the final days before expiration.