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OptionsMath

Short Butterfly Calculator

Short butterfly profit equals short lower call plus two long middle calls plus short upper call payoff at expiration.

Expiration scenarios

Solution

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Educational estimate only, not financial advice. Results exclude commissions, taxes, slippage, dividends, assignment risk, margin, and broker-specific rules. Verify before trading options.

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Short Butterfly Formula

A short butterfly reverses the classic long butterfly, profiting outside the wings and losing near the middle strike.

Worked Examples

Load these examples to compare common short butterfly payoff outcomes.

SHORT BUTTERFLY

Model a reverse butterfly payoff

The stock finishes outside the upper wing and the trade keeps its outside-wing profit.

  • Enter the manual prices and assumptions.
  • Review the calculated risk, reward, and break-even metrics.
  • Compare the chart with the highlighted scenario.

Result: the calculator updates the scenario metrics and chart from those inputs.

Real fills, fees, and broker margin rules are not modeled.

How It Works

A short butterfly sells the outside calls and buys two middle calls, creating the reverse of a long butterfly payoff.

Example Problem

Sell the lower and upper calls, buy two middle calls, and keep equal wing widths.

  1. Calculate net credit or debit.
  2. Find break-even prices.
  3. Calculate max profit outside the wings.
  4. Calculate max loss near the middle strike.

Short butterflies are defined risk, but the best outcomes require the stock to finish away from the body strike.

Key Concepts

The short butterfly is a defined-risk long-move payoff with capped profit outside the wings.

Applications

  • Comparing reverse butterfly trades.
  • Modeling event-move structures.
  • Checking defined-risk alternatives to long straddles.

Common Mistakes

  • Confusing short butterfly with short iron butterfly.
  • Ignoring equal wing width.
  • Assuming unlimited tail profit.

Frequently Asked Questions

What does the Short Butterfly Calculator calculate?

It calculates the selected options result from manual inputs, without requiring live stock or option quotes.

Does this calculator need live market data?

No. Enter the prices, premiums, volatility, days, or Greeks yourself. The calculator uses those manual inputs only.

Are commissions, taxes, margin interest, and assignment fees included?

No. The result excludes commissions, fees, taxes, borrow costs, slippage, and broker-specific margin rules.

Why can real trading results differ?

Real option prices can change with implied volatility, liquidity, dividends, early assignment, and execution prices.

Reference: Standard options payoff, probability, and risk-management formulas.

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