How to Use This Long Put Calculator
Enter any U.S. stock or ETF ticker symbol above to instantly load the live options chain and current stock price. Select an expiration date from the tab strip — for directional bearish plays, most traders target 30–90 days to expiration to balance premium cost and time for the move to develop.
Click a put strike price in the options chain table. The calculator defaults to the ask price — the price you actually pay as a buyer. It then instantly computes total cost, breakeven, required fall percentage, intrinsic vs. extrinsic value, and a full payoff diagram.
Use the Target Price input to model your expected profit at a specific downside level. The multi-expiration comparison table shows cost and breakeven across all available expirations for the same strike, helping you find the best risk/reward for your time horizon.
How to Calculate Long Put Profit and Loss
A long put has defined risk and substantial (though capped) downside profit. Here are the core formulas, with a worked example using a stock at $50.00, a $50 ATM put purchased for $2.00 premium (45 days to expiration, 2 contracts).
Total Cost (Max Loss)
Premium × 100 × Contracts
$2.00 × 100 × 2 = $400
The total cash outlay and maximum amount you can lose. This is your entire risk on the trade.
Breakeven at Expiry
Strike Price − Premium
$50.00 − $2.00 = $48.00
The stock price at which the trade breaks even at expiration. The stock must close below this to profit.
Required Fall (%)
(Stock Price − Breakeven) ÷ Stock Price
($50.00 − $48.00) ÷ $50.00 = 4.0%
How much the stock must fall from the current price just to break even at expiration.
Intrinsic Value
MAX(0, Strike − Stock Price)
MAX(0, $50.00 − $45.00) = $5.00
The in-the-money portion of the premium. Only exists if the stock is below the strike price.
Extrinsic Value (Time Value)
Premium − Intrinsic Value
$2.00 − $0.00 = $2.00 (OTM)
The portion of premium beyond intrinsic value. Erodes to zero at expiration due to theta decay.
Max Profit
(Strike − Premium) × 100 × Contracts
($50 − $2) × 100 × 2 = $9,600
Achieved if the stock falls to zero at expiration. Unlike a long call, max profit is finite.
P&L at Expiry
MAX(−Total Cost, (Strike − Price − Premium) × 100 × Contracts)
($50 − $42 − $2) × 100 = $600
Your profit or loss if you hold to expiration, based on the final stock price.
Return on Risk
P&L ÷ Total Cost
$600 ÷ $400 = 150%
The return relative to your total premium paid (maximum risk).
How to Choose a Strike Price for a Long Put
Strike selection for long puts mirrors call buying — but in reverse. In-the-money (ITM) puts have a higher delta (negative) and act more like short stock, costing more but requiring a smaller move. Out-of-the-money (OTM) puts are cheaper with higher leverage but require a larger price decline to profit.
| Strike Type | Premium Cost | Required Fall | Best For |
|---|---|---|---|
| Deep ITM (10%+ above price) | High | Very Low | Mostly intrinsic value; acts like short stock with less capital |
| Slight ITM (0–10% above price) | Moderate–High | Low | High delta; lower required fall; costs more |
| ATM (at the money) | Moderate | Moderate | Balanced delta and extrinsic value; most liquid |
| Slight OTM (0–10% below price) | Low–Moderate | Moderate–High | Most common speculative buy; leveraged downside |
| Far OTM (15%+ below price) | Very Low | Very High | Lottery-ticket risk; high potential %, very low probability |
Intrinsic Value vs. Extrinsic Value on a Put Option
Every option premium is composed of two parts. For long put buyers, understanding this split is critical because extrinsic value decays to zero at expiration (theta) regardless of what the stock does.
Intrinsic Value
MAX(0, Strike − Stock Price)
The real, in-the-money value of the option. A $50 put on a $45 stock has $5.00 of intrinsic value. An out-of-the-money put has zero intrinsic value. Only extrinsic value decays — intrinsic value does not.
Extrinsic Value (Time Value)
Premium − Intrinsic Value
The premium above intrinsic value, reflecting time remaining, implied volatility, and the probability that the put moves further in-the-money. Extrinsic value decays daily (theta) and reaches zero at expiration — the core cost of buying puts.
Practical implication: An ATM $50 put on a $50 stock purchased for $2.00 has $0 intrinsic and $2.00 extrinsic value. If the stock is still at $50 at expiration, the put expires worthless — you lose the full $200 per contract even though the stock didn't rally.
How Theta (Time Decay) Affects Long Put Buyers
Theta is the daily erosion of an option's extrinsic value. For long put buyers — just like long call buyers — theta works against you continuously, regardless of stock movement.
| Why theta hurts | How to manage theta risk |
|---|---|
Every day that passes reduces the put's extrinsic value | Buy puts with 45–90+ DTE to minimize near-expiry acceleration |
Theta decay accelerates exponentially in the final 30 days before expiration | Close the trade early (50–75% of max profit) rather than holding to expiration |
A flat or slowly declining stock results in a net loss | Use ITM puts — lower extrinsic value means less daily theta cost |
You need the stock to fall quickly enough to outpace theta erosion | Buy during low IV environments so premiums are cheaper |
Very short-dated OTM puts lose value at the fastest rate | Have a defined price target and time stop before entering |
When Should You Buy a Put Option?
| Favorable conditions | Unfavorable conditions |
|---|---|
You expect a significant, near-term bearish move (earnings miss, guidance cut, breakdown) | Implied volatility is elevated — put premiums are expensive relative to historical norms |
Implied volatility is low — you're buying options at a relative discount | The stock is in a strong uptrend with bullish fundamental catalysts |
The stock is in a confirmed downtrend with momentum indicators supporting the move | The stock has already sold off hard and IV crush risk is high post-event |
You want to hedge an existing long position against a market pullback | You're buying very short DTE puts without a specific near-term catalyst |
You're buying 45–90 DTE to give the trade room to develop | The required fall exceeds what is realistic in your time frame |
Long Put vs. Short Selling
Both strategies profit when a stock declines, but they differ significantly in risk profile, capital requirements, and time constraints.
| Factor | Long Put | Short Selling |
|---|---|---|
| Capital required | Premium only (e.g., $200/contract) | Margin account + collateral; typically 50%+ |
| Maximum loss | Premium paid (defined risk) | Theoretically unlimited (stock can rise indefinitely) |
| Maximum profit | (Strike − Premium) × shares (limited) | Stock price × shares (stock falls to zero) |
| Time limit | Yes — must profit before expiration | No — can hold indefinitely (subject to margin) |
| Borrow requirement | None | Must borrow shares; borrow cost can be high |
| Dividends | Not affected | Short seller must pay dividends to lender |
| Volatility impact | Benefits from IV expansion | No direct options volatility exposure |
| Breakeven | Strike − Premium | Your short entry price |
| Best when | Expecting a swift, significant decline with limited time | Long-term bearish; no time pressure |
Long Put vs. Long Call
Long puts and long calls are mirror-image strategies. Both have defined risk (premium paid) but profit in opposite directions.
| Factor | Long Put | Long Call |
|---|---|---|
| Directional bias | Bearish | Bullish |
| Profits when | Stock falls below breakeven | Stock rises above breakeven |
| Breakeven | Strike − Premium | Strike + Premium |
| Intrinsic value | MAX(0, Strike − Stock) | MAX(0, Stock − Strike) |
| Max profit | Limited (stock floor is zero) | Unlimited (no ceiling) |
| Max loss | Premium paid | Premium paid |
| Common use | Directional bet on a decline or portfolio hedge | Directional bet on a rally |
Frequently Asked Questions
How do you calculate long put profit?▾
What is the breakeven for a long put?▾
What is the max loss on a long put?▾
What is the max profit on a long put?▾
What is intrinsic value vs extrinsic value on a put option?▾
When should I buy a put option?▾
How does theta affect a long put?▾
Long put vs short selling — what is the difference?▾
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