Synthetic Put Calculator
Model your synthetic put before you place it. Enter your short stock position and long call to instantly see max profit, capped max loss, breakeven, and a full P&L diagram for your synthetic put position.
How to Use This Calculator
Enter your short stock position and long call and the calculator handles the rest. Results update instantly as you type.
Enter your short stock position
Enter the number of shares sold short and the price at which you shorted them. This is the bearish leg of the position and the starting point for calculating your breakeven and max profit.
Enter the long call strike
Enter the strike price of the call option you are buying. This is typically at or near your short stock price, converting your unlimited upside short-stock risk into a defined maximum loss.
Enter the call premium paid
Enter the premium paid per share for the long call. This cost raises your breakeven slightly above the short stock price and becomes the maximum loss if the stock closes above the call strike at expiration.
Review your results
The calculator shows your capped max loss, breakeven price, and growing profit as the stock falls, along with a full P&L diagram showing how the combined position performs at every stock price at expiration.
Understanding the Synthetic Put
Key numbers every synthetic put trader needs to know before entering the position.
A synthetic put combines a short stock position with a long call at or near the same strike to replicate the payoff of a long put option. The short stock is the bearish engine — it profits as the stock falls. The long call is the protection — it caps the loss if the stock unexpectedly rises, because the call gains value fast enough to offset the short stock losses above the call strike.
The result is a position with a P&L diagram nearly identical to a long put. Below the breakeven the position profits. Above the call strike the loss is capped. The main practical difference from simply buying a put is that the synthetic put requires an actual short stock position, which involves margin requirements, borrow costs, and the risk of a short squeeze. For most retail traders, buying a put directly is simpler and more capital-efficient.
The synthetic put is most useful when a trader already has an existing short stock position and wants to add defined upside protection without closing the trade. Adding a long call converts the open-ended short into a controlled, hedged position. It is also used in situations where put options are unavailable or illiquid on a particular security, and the trader needs to construct bearish exposure with limited risk from available instruments.
Synthetic Put Example Trade
XYZ is at $100. Short 100 shares at $100. Buy 1 $100 call for $3.00. Net position cost: $3.00 debit.
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Synthetic put — frequently asked questions
A synthetic put combines a short stock position with a long call option to replicate the profit and loss profile of a long put. You profit when the stock falls and your loss is capped if the stock rises, because the long call appreciates to offset the short stock loss above the call strike. It is also called a protective call, because the long call protects an existing short stock position from unlimited upside risk.
The maximum profit on a synthetic put is theoretically very large because a stock can fall all the way to zero. Profit increases dollar for dollar as the stock falls below the breakeven price (short stock price minus call premium paid). If you short at $100 and pay $3.00 for the call, breakeven is $97.00. If the stock falls to $70, profit is ($97 − $70) × 100 = $2,700. If it falls to zero, profit reaches $9,700 per position.
The maximum loss is capped and defined. If the stock rises above the call strike, the long call gains value and offsets the short stock losses, capping the net loss at (call strike − short stock entry price + call premium) × 100. When the call is struck at the same price as the short stock entry, the cap is simply the call premium paid: $3.00 × 100 = $300. This is one of the key benefits over naked short stock, which carries unlimited upside risk.
A long put and a synthetic put produce nearly identical P&L diagrams, but they differ significantly in construction. Buying a put requires only one transaction and no margin for short stock. A synthetic put requires shorting shares (with margin, borrow costs, and short-squeeze risk) plus buying a call. For a standalone bearish trade, buying a put is almost always simpler and more capital-efficient. The synthetic put is most practical when you already hold short stock and want to add defined upside protection without closing the position.
The synthetic put is most useful when you already have a short stock position and want to add a defined loss ceiling without exiting the trade. Buying a call against an existing short converts open-ended risk into a known maximum loss. It is also used when put options are unavailable or illiquid on a specific security, requiring the synthetic construction instead. For traders building a new bearish position from scratch, buying a put outright is usually more practical than constructing the synthetic version.