What Is a Butterfly Option Strategy?
A butterfly option strategy is a neutral options spread that profits when the underlying asset stays near a target price through expiration. The strategy combines a bull spread and a bear spread into a single position using three strike prices. The classic long call butterfly involves buying one call at a lower strike, selling two calls at a middle strike, and buying one call at a higher strike — all with the same expiration date. The result is a position with limited risk and limited profit potential, characterized by its distinctive tent-shaped payoff diagram.
Butterfly strategies come in three main variants: the long call butterfly, the long put butterfly, and the iron butterfly. While the call and put versions use options of a single type, the iron butterfly combines both calls and puts by selling an at-the-money straddle and buying out-of-the-money wings for protection. All three variants produce similar payoff profiles at expiration, making them versatile tools for range-bound market conditions.
Why Use Our Butterfly Option Strategy Calculator?
Three Strategy Types
Calculate long call butterfly, long put butterfly, and iron butterfly strategies. Compare how each variant behaves with different strike prices and premiums.
Complete P&L Analysis
Instantly see net debit/credit, maximum profit, maximum loss, risk-reward ratio, breakeven prices, and return on risk for any butterfly configuration.
Full Greeks Dashboard
View aggregate Delta, Gamma, Theta, and Vega calculated using the Black-Scholes model. Understand your directional exposure, time decay, and volatility sensitivity.
Interactive Payoff Chart
Visualize the profit and loss diagram at expiration with breakeven points, max profit zone, and current price reference clearly marked on an SVG chart.
Greeks Sensitivity Charts
See how Delta, Gamma, Theta, and Vega change across a range of underlying prices. Identify where your position is most sensitive to market moves.
Instant Recalculation
All results update in real time as you adjust inputs. Experiment with different strike widths, premiums, and contract quantities to find the optimal setup.
How to Use This Butterfly Option Strategy Calculator
- 1
Choose Your Butterfly Type
Select from Long Call Butterfly, Long Put Butterfly, or Iron Butterfly. Each type has a different leg structure but produces a similar tent-shaped payoff.
- 2
Enter Strike Prices & Premiums
Input the underlying stock price, three strike prices (lower, middle, upper), and the premium for each leg. The middle strike should be at or near the current stock price for a neutral outlook.
- 3
Set Position Size & Parameters
Specify the number of contracts, days to expiration, implied volatility, and risk-free rate. These parameters affect the Greeks calculations and sensitivity analysis.
- 4
Analyze Results & Charts
Review the summary cards showing max profit, max loss, breakevens, and Greeks. Switch between the P&L diagram and Greeks sensitivity charts to understand your position from every angle.
Important Considerations
- Symmetric Wing Width: For a standard butterfly, the distance from the lower strike to the middle strike should equal the distance from the middle strike to the upper strike. Asymmetric butterflies (broken-wing) have different risk profiles.
- Commissions Impact: Butterfly spreads involve three legs (four contracts total), so commission costs can significantly reduce profitability. Always factor in your broker's per-contract fees.
- Bid-Ask Spread: Wide bid-ask spreads on individual legs can erode the theoretical edge. Focus on liquid options with tight spreads for the most realistic results.
- Early Assignment Risk: American-style options can be exercised early. The short middle legs of a butterfly are most vulnerable to early assignment, especially near ex-dividend dates for in-the-money options.
- Iron vs. Standard: Iron butterflies are entered for a credit and have the same payoff as standard butterflies, but they may have different margin requirements and tax treatment depending on your broker.