Synthetic Short Stock Calculator
A synthetic short stock combines a short call and a long put at the same strike. Together they replicate the payoff of shorting 100 shares — dollar-for-dollar downside profit and uncapped upside risk — usually for little or no net cost, and without borrowing the stock.
Interactive calculator
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Key characteristics
- Short call + long put at the same strike = the payoff of being short 100 shares.
- Profits as the stock falls, with effectively unlimited loss as it rises.
- Often opened for a small credit or debit, by put-call parity.
- A capital-efficient way to be bearish without locating and borrowing shares.
When to use synthetic short stock
Use a synthetic short when you want a pure bearish, stock-like exposure but shorting the shares is hard, expensive to borrow, or unavailable in your account. The combined position moves almost exactly like short stock: a 100-delta bearish bet.
By put-call parity the call premium you receive roughly offsets the put premium you pay, so the position often costs little to open — the appeal is leverage and capital efficiency versus shorting outright.
Risks and assignment
The risk mirrors short stock: losses are unlimited if the stock rallies, and the short call can be assigned early — especially before a dividend — leaving you actually short the shares. Treat it with the same caution as a real short position.
It is the exact opposite of a synthetic long stock (long call + short put). Pairing the two ideas helps you see how options can rebuild any stock exposure from puts and calls.
Calculate it live
Use the free OptionProfit Synthetic Short Stock calculator to load a live option chain, build the trade, and instantly see the payoff chart, breakevens, probability of profit, Greeks and a Monte Carlo simulation of outcomes.
- Short call + long put at one strike = the payoff of short 100 shares.
- Bearish, ~100 delta; profits down, unlimited risk up.
- Usually near-zero cost by put-call parity; no share borrow needed.
- The mirror of a synthetic long stock — and as risky as a real short.
Frequently asked questions
Why use a synthetic short instead of just shorting the stock?
When shares are hard or expensive to borrow, or your account cannot short, the options replicate the exposure capital-efficiently and without a borrow fee.
Is the risk really unlimited?
Yes — like a real short, losses grow without bound as the stock rises, because the short call has no upside cap. Manage it as carefully as short stock.
What is the breakeven?
Roughly the shared strike adjusted for any net credit or debit — close to the stock price when the call and put premiums offset, as they tend to at the at-the-money strike.
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