OPTIONS
Protective Put Calculator \u2014 Portfolio Insurance
By Worldtickers ·
Use our free protective put calculator to estimate cost, breakeven, and max loss for a protective put on stock you own. Enter your stock price, put strike, and premium to see the full payoff.
This protective put calculator \u2014 portfolio insurance tool focuses on use our free protective put calculator to estimate cost, breakeven, and max loss for a protective put on stock you own. Enter your stock price, put strike, and premium to see the full payoff. Use it to test option prices, strikes, premiums, expiration assumptions, and strategy outcomes so you can compare payoff scenarios, break-even levels, risk, and potential reward before placing an options trade.
Protective Put Calculator
Protective Put Calculator
Calculate the cost and downside protection of buying a protective put.
What Is a Protective Put?
A protective put is an options strategy where you buy a put option on a stock you already own. It acts as insurance against a decline in the stock price. If the stock falls, the put option increases in value, offsetting the loss on the stock. If the stock rises, you keep the gains but lose the put premium paid. The strategy provides downside protection while preserving unlimited upside potential.
The protective put is one of the simplest and most effective hedging strategies available. It is essentially portfolio insurance for individual stock positions. The cost of the put is a known, fixed expense that provides peace of mind and protection against unexpected market declines.
The strategy is sometimes called a "married put" because the put is purchased simultaneously with the stock (or on an existing stock position). It is widely used by investors who want to hold stocks long-term but need temporary protection during uncertain periods.
How to Use This Calculator
The calculator takes the stock price, put strike, premium, and number of shares to produce a complete payoff analysis for the protective put strategy.
Stock Purchase Price
Enter the price at which you purchased (or currently hold) the stock. This is your cost basis and is used to calculate profit or loss. If you are entering a new position, use the current market price. If you are hedging an existing position, use your average cost basis.
Put Strike Price
Enter the strike price of the protective put you are buying. This is the floor price below which your stock cannot lose value. The put strike should be below the current stock price. A put strike closer to the current price provides more protection but costs more. A strike further away provides less protection but is cheaper.
Put Premium
Enter the premium you pay for the protective put. This is a cost that reduces your overall return. The premium depends on the strike price, time to expiration, and implied volatility. A put closer to the money costs more than one further out of the money.
Number of Shares
Enter the number of shares you own (or plan to buy). Each put option contract covers 100 shares. The calculator scales the output by the number of shares to show the total dollar impact.
Formula
The key formulas for a protective put are:
Total Cost = Put Premium × Number of Shares
This is the total amount you pay for the protective put insurance. It is a sunk cost that reduces your overall return, regardless of the stock's performance.
Breakeven = Stock Price + Put Premium
The stock must rise above this price for the protective put position to be profitable at expiration. Below this price, the position loses money, with the maximum loss occurring at or below the put strike.
Max Loss = (Stock Price — Put Strike) + Put Premium
This occurs when the stock falls to or below the put strike at expiration. The protective put limits the loss to the difference between your stock price and the put strike, plus the premium paid.
Max Profit = Unlimited — Put Premium
Because you own the stock and retain full upside potential, the stock can rise indefinitely. Your net profit is the stock price appreciation minus the put premium paid.
Examples
Example 1: Protective Put on AAPL
You own 100 shares of AAPL at $150. You buy the $140 put for $2.00, paying $200 for protection. If AAPL falls to $130 at expiration, the put is worth $10, giving you a $800 gain on the put ($1,000 intrinsic value — $200 premium). Your stock loss is $2,000 ($150 — $130 × 100). Net position: $2,000 loss on stock + $800 gain on put = $1,200 net loss, compared to $2,000 without the put. The put saved you $800. Breakeven is $152. If AAPL rises to $170, you keep the $2,000 stock gain minus the $200 put cost = $1,800 net profit.
Example 2: Deep OTM Protective Put on MSFT
You own 100 shares of MSFT at $400. You buy the $370 put for $1.50, paying $150 for protection. This put is 7.5% out of the money, so it costs less but provides less protection. If MSFT falls to $360, the put is worth $10, giving you an $850 gain ($1,000 intrinsic value — $150 premium). Your stock loss is $4,000. Net position: $4,000 loss on stock + $850 gain on put = $3,150 net loss. Without the put, you would lose $4,000. The deep OTM put costs less but provides a wider protection gap (you absorb the first $30 of decline).
Example 3: ATM Protective Put on TSLA
You own 100 shares of TSLA at $200. You buy the $200 put (at the money) for $8.00, paying $800 for protection. This provides the strongest protection but at a higher cost. If TSLA falls to $180, the put is worth $20, giving you a $1,200 gain ($2,000 intrinsic value — $800 premium). Your stock loss is $2,000. Net position: $2,000 loss on stock + $1,200 gain on put = $800 net loss. Without the put, you would lose $2,000. The ATM put saved you $1,200 but cost $800 upfront, making the net savings $400. Breakeven is $208.
Tips
Choose the Strike Based on Your Risk Tolerance
The put strike determines the floor price for your stock. If you can tolerate a 10% decline, set the put strike 10% below the current price. A deeper out-of-the-money put costs less but provides a wider protection gap. An at-the-money put provides maximum protection but costs the most. Balance the cost of protection against the level of downside you are comfortable absorbing.
Buy Protection Before Volatility Spikes
Implied volatility increases the cost of protective puts. If you anticipate a volatile event (earnings, economic data, geopolitical news), buy the put before IV spikes to lock in a lower cost. After the event, IV typically drops, which reduces the put's value. This is the opposite of selling options, where you want to sell when IV is high.
Consider the Time Horizon
The longer the time until expiration, the more expensive the put. If you only need protection for a short period (e.g., a week before earnings), buy a short-term put. If you need ongoing protection, consider buying a longer-term put or rolling shorter-term puts. The time decay (theta) on the put works against you, so match the expiration to your actual protection needs.
Sell the Put to Close Instead of Exercising
If the stock falls and you want to realize the protection, sell the put in the market rather than exercising it. Selling captures the remaining time value, which is lost if you exercise. Exercise is only optimal when the put is deep in the money and has minimal time value remaining. In most cases, selling the put provides a better exit price.
FAQ
What is a protective put?
A protective put is an options strategy where you buy a put option on a stock you already own. It acts as insurance against a decline in the stock price. If the stock falls, the put option increases in value, offsetting the loss on the stock. If the stock rises, you keep the gains but lose the put premium paid. The strategy provides downside protection while preserving unlimited upside potential.
When should I use a protective put?
A protective put is ideal when you want to hold a stock long-term but are concerned about a potential decline in the near term. It is commonly used before earnings announcements, economic data releases, or other uncertain events. The strategy is also popular for protecting unrealized gains on a stock that has recently rallied. It is essentially portfolio insurance for individual stock positions.
What is the cost of a protective put?
The cost is the premium paid for the put option. This premium depends on the strike price, time to expiration, and implied volatility of the stock. A put closer to the current stock price (at the money) costs more than one further out of the money. The cost is a sunk expense that reduces your overall return, even if the stock does not decline. It is similar to paying an insurance premium.
What is the maximum profit on a protective put?
The maximum profit is unlimited. Because you own the stock and retain full upside potential, the stock can rise indefinitely. Your net profit is the stock price appreciation minus the put premium paid. For example, if you buy a stock at $100 and a $95 put for $3, and the stock rises to $130, your profit is $130 — $100 — $3 = $27 per share.
What is the maximum loss on a protective put?
The maximum loss is the difference between the stock purchase price and the put strike price, plus the put premium paid. For example, if you buy a stock at $100 and a $95 put for $3, the maximum loss is ($100 — $95) + $3 = $8 per share. This occurs when the stock falls to or below $95 at expiration. The put limits the loss to the difference between your cost basis and the strike, plus the premium.
What is the breakeven for a protective put?
The breakeven price is the stock purchase price plus the put premium paid. In the example above, the breakeven is $100 + $3 = $103. The stock must rise above this price for the protective put position to be profitable at expiration. Below this price, the position loses money, with the maximum loss occurring at or below the put strike.
How does implied volatility affect a protective put?
Higher implied volatility increases the cost of the protective put because it raises the option premium. This makes the insurance more expensive. Lower IV reduces the put cost, making protection cheaper. If you anticipate a volatility event (e.g., earnings), buying the put before IV spikes can lock in a lower cost. After the event, IV typically drops, which can reduce the put's value.
What strike should I choose for a protective put?
The strike price determines the level of protection. An at-the-money put provides the most protection but costs the most. An out-of-the-money put (e.g., 5-10% below the current price) costs less but provides less protection. Choose the strike based on how much loss you can tolerate: a $95 put on a $100 stock limits losses to $5 plus the premium, while a $90 put limits losses to $10 plus the premium.
Can I sell the put before expiration?
Yes. You can sell the put option in the market before expiration to close the protective put position. The selling price depends on the stock price, time remaining, and implied volatility. If the stock has fallen, the put will be worth more than you paid, offsetting some of the stock loss. If the stock has risen, the put will be worth less, and you realize a loss on the put but keep the stock gains.
How does a protective put compare to a stop-loss order?
A protective put guarantees a sale price at the put strike, while a stop-loss order triggers a market order when the stock hits a certain price. In a fast-moving market, a stop-loss can execute at a much lower price than the stop level (slippage), while a put guarantees the strike price. The put costs a premium upfront, while a stop-loss has no cost but carries execution risk. The put is better for guaranteed protection; the stop-loss is better for cost-conscious traders.