Butterfly Spread Calculator
Enter your butterfly spread details below to calculate P&L, breakevens, and Greeks instantly.
Get real-time data for any ticker
Live chains, auto-filled premiums, real Greeks from ORATS institutional data. 5,500+ stocks.
Start Free Trial or try AAPL free — no signupStop guessing. Trade with real data.
This calculator gives you estimates. The full platform gives you live options chains, real-time Greeks, and institutional ORATS data for 5,500+ tickers. See the difference instantly.
Join 2,000+ options traders · Cancel anytime · No credit card to start
- ✓ P&L at expiration
- ✓ Estimated Greeks
- ✓ Breakeven analysis
- ✗ Live option prices
- ✗ Real IV data
- ✗ Multi-leg builder
- ✓ Real-time ORATS data
- ✓ 5,500+ tickers
- ✓ Multi-leg strategy builder
- ✓ Scenario & IV analysis
- ✓ Portfolio-level Greeks
- ✓ Options flow & GEX
No credit card required
- ✓ Everything included
- ✓ Vol surface & skew
- ✓ Earnings IV crush
- ✓ Smart money detection
- ✓ Dark pool flow
- ✓ Priority support
Butterfly Spread at a Glance
| Strategy Type | Neutral / Pinning (expects stock near middle strike) |
| Legs | 3 strikes: buy 1 lower, sell 2 middle, buy 1 upper (equidistant wings) |
| Max Profit | Wing width minus net debit (at middle strike at expiration) |
| Max Loss | Net debit paid (below lower or above upper strike) |
| Breakevens | Lower strike + debit and Upper strike - debit |
| Ideal IV Environment | High IV at entry (cheap wings); expect IV to fall |
| Time Decay (Theta) | Positive near middle strike; negative far from it |
| Risk/Reward | Low cost, high reward ratio (often 2:1 to 5:1) |
| Best DTE | 14-30 days to expiration |
What Can You Calculate?
Max Profit & Loss
Instantly see your maximum profit (wing width minus net debit) and maximum loss (net debit paid). Defined risk with no surprises.
Breakeven Points
Two breakeven prices calculated automatically: lower strike + debit and upper strike - debit. See exactly where the profit zone begins and ends.
All Greeks
Delta, Gamma, Theta, and Vega for the combined 3-leg position. Understand how price, time, and volatility affect your butterfly.
P&L Diagram
Visual tent-shaped payoff chart showing profit/loss at every stock price. Instantly see the risk/reward profile.
Call & Put Butterflies
Toggle between call butterfly and put butterfly constructions. Same payoff shape, different option types.
Risk/Reward Ratio
See your risk/reward ratio instantly. Butterflies often deliver 2:1 to 5:1 or better, making them ideal low-cost strategies.
How to Calculate Butterfly Spread P&L
Enter Stock Price
Type the current stock price. The calculator uses this to determine if your butterfly is centered ATM, ITM, or OTM.
Set Three Strikes
Choose lower, middle, and upper strikes with equidistant wings. The middle strike is your profit target at expiration.
Enter Premiums
Enter the premium for each leg. Net debit = lower premium - 2 x middle premium + upper premium. This is your maximum risk.
View Results
Instantly see max profit, max loss, both breakeven prices, Greeks, and the tent-shaped P&L diagram. Adjust inputs to test scenarios.
Butterfly Formulas
- + Net Debit: Lower premium - 2 x middle premium + upper premium
- + Max Profit: (Middle strike - lower strike) - net debit, x 100
- - Max Loss: Net debit x 100 (below lower or above upper)
- = Lower B/E: Lower strike + net debit
- = Upper B/E: Upper strike - net debit
Example: SPY $445/$450/$455 Call Butterfly
A real butterfly spread example showing how the calculator works step by step.
The Setup
Stock Price: SPY = $450.25
Buy 1 $445 call: $8.30
Sell 2 $450 calls: $5.15 each (-$10.30)
Buy 1 $455 call: $3.00
Net Debit: $8.30 - $10.30 + $3.00 = $1.00/share
Max Profit: ($5.00 - $1.00) x 100 = $400
Max Loss: $1.00 x 100 = $100
Risk/Reward: 1:4 ($100 risk for $400 reward)
Calculator Results
- ✓ Lower Breakeven: $446.00 ($445 + $1.00)
- ✓ Upper Breakeven: $454.00 ($455 - $1.00)
- ✓ Profit Zone: $446.00 to $454.00 ($8.00 wide, 1.8% of stock price)
- ✓ Delta: +0.02 (nearly neutral)
- ✓ Theta: +$4/day (benefits from time decay near middle strike)
Iron Butterfly vs Long Butterfly
Both strategies share the same tent-shaped payoff diagram, but they differ in construction and cash flow.
| Long Call Butterfly | Iron Butterfly | |
|---|---|---|
| Construction | All calls (or all puts) | Sell ATM straddle + buy OTM strangle |
| Entry | Net debit | Net credit |
| Max Profit | Wing width − debit | Net credit received |
| Max Loss | Net debit paid | Wing width − credit |
| Breakevens | Lower + debit / Upper − debit | Middle − credit / Middle + credit |
| Best IV | Moderate; buy cheap wings | High IV; sell expensive straddle |
Understanding Butterfly Greeks
Butterfly Greeks change dramatically based on where the stock sits relative to the middle strike.
Delta
Near zero at the middle strike (neutral). Positive below middle, negative above. Re-center or close if delta exceeds +/-0.20.
Theta
Strongly positive near middle strike (time decay helps). Flips negative near the wings. Peak decay in final 7-14 days.
Vega
Negative vega at middle strike (profits from IV drop). Best entered before expected IV crush like post-earnings events.
Gamma
Strongly negative at middle strike. P&L changes rapidly as stock moves. Take profits at 50-75% of max before the final week.
Choosing the Right Wing Width
Narrow Wings ($2.50-$5)
- Cost: Very low debit ($0.25-$1.00)
- High percentage return on capital
- Narrow profit zone; stock must pin
- Best for: Earnings pins, low-cost speculation
Standard Wings ($5-$10)
- Cost: Moderate debit ($0.75-$2.50)
- Good reward-to-risk (3:1 to 5:1)
- Reasonable profit zone width
- Best for: $100-$500 stocks, range-bound
Wide Wings ($10-$25)
- Cost: Higher debit ($2.00-$5.00)
- Large dollar amount, lower % return
- Wider profit zone, higher probability
- Best for: High-priced stocks, longer DTE
Frequently Asked Questions
What is a butterfly spread calculator?
A butterfly spread calculator is a tool that computes max profit, max loss, breakeven points, and Greeks for butterfly option spreads. It supports both long call/put butterflies and iron butterflies, helping traders evaluate risk/reward before entering a position. Our free calculator does this instantly with an interactive P&L chart.
How do you calculate butterfly spread max profit?
Max Profit = Wing Width - Net Debit Paid. For a $445/$450/$455 call butterfly purchased for $1.50, max profit = $5.00 - $1.50 = $3.50 per share ($350 per contract). Maximum profit occurs when the stock closes exactly at the middle strike at expiration.
What are the breakeven points for a butterfly spread?
Lower Breakeven = Lower Strike + Net Debit. Upper Breakeven = Upper Strike - Net Debit. For a $445/$450/$455 butterfly at $1.50 debit: Lower BE = $446.50, Upper BE = $453.50. Profit occurs between these two prices at expiration.
When should I close a butterfly spread?
Most traders target 50-75% of maximum profit and close before the final week. Gamma risk accelerates dramatically in the last 5-7 days, so collecting a portion of the profit early is generally safer than holding for the full pin. Use the calculator to model different exit dates.
Is this butterfly calculator free?
Yes. The butterfly spread calculator above is completely free with interactive P&L charts, breakevens, and Greeks. For access to all 5,500+ tickers with live ORATS data and advanced scenario analysis, start a free 7-day trial.
Related Options Tools
Options Calculator
General-purpose calculator for any single or multi-leg strategy. Compare butterflies against other spreads.
Iron Condor Calculator
Calculate iron condor profit zones, breakevens, and Greeks. Compare risk/reward against butterflies.
IV Calculator
Analyse implied volatility, IV rank, and IV percentile. Time butterfly entries for maximum edge.
Start Using the Butterfly Spread Calculator
Calculate max profit, max loss, and breakevens for butterfly spreads. Free, no signup required.
7-day free trial • Cancel anytime • No commitment