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OPTIONS VALUE ESTIMATOR

Long Put Profit Calculator

Estimate how stock price, implied volatility, and time could affect your long put.

OPTIONS TRADE

P
Expiration
StrategyLONG PUT
Contracts1 CONTRACT
CURRENT PREMIUM—
CURRENT P/L—
CURRENT P/L %—

Your Position

Enter the position you currently hold.

Position updates automatically
Current underlying price
$
Current option premium
$
CURRENT POSITIONUser-entered current premiums
Current premium—
Current position value—
Current P/L—
Current P/L percentage—

Price Scenario

Change the target price, date, and implied volatility to model what the same position could become.

Current underlying—
Target underlying—
Target timestamp—
Expiration—
IV assumption25%
Check your inputs

Current underlying price is required.

Strike price is required.

Purchase premium is required.

Current option premium is required.

Target price is required.

Choose a target and expiration date.

Choose a valid Through Time.

ESTIMATED CONTRACT VALUE—
Total position value—
Position cost basis—
Projected Outcome—
Estimated return—
P/L chart available when inputs are valid.
P/L heatmap available when inputs are valid.
Estimate only—not investment advice. Actual market prices can differ because of volatility changes, liquidity, dividends, and other market conditions.

How this calculator works

A long put gives the holder the right to sell shares at the strike through expiration and can gain value as the underlying falls.

How to use it

Use the actual put strike and premium, then compare a downside target with the expiration break-even. Model the planned exit date separately from expiration when the thesis is short-term, because a put can lose time value while the stock is flat.

Formula, payoff, and assumptions

At expiration, put value is the greater of strike minus stock price or zero; profit subtracts the premium paid.

The expiration payoff assumes the put is held through expiry. Earlier values are estimates and can differ from an executable price when spreads are wide or volatility changes.

Practical example

A $100 put bought for $3 breaks even near $97 at expiration before fees.

Reading this result

The distance from current price to the lower break-even matters more than the put’s strike by itself. A modest decline may not overcome premium paid before expiration.

Common planning mistake

Do not assume a falling stock guarantees a profit. If the decline is slower than expected, theta decay or lower implied volatility can reduce the put’s resale value.

Risk and limitations

The premium can be lost. Time decay and a decline in implied volatility can reduce value before expiration.