Explore premium income and the large losses possible when a stock moves away from the shared strike.
Your position
Illustrative starting values · USD
Use one stock or ETF and the same expiration for every option leg. Prices are per share.
Modified position
Stock quantities are shares. Option quantities are contracts. Enter the total fees for the entire position once.
Net entry cost
Maximum profit
Maximum loss
Breakeven stock price
Profit / loss at expiration
Entire position · Includes entered fees
Move over the chart or adjust the stock price to inspect a scenario. Shading marks profit and loss.
What if the stock ends at…
Profit / loss at expiration
View payoff table
Sample outcomes at expiration, including strike and breakeven prices
Stock price
Profit / loss
Maximum profit and loss consider all stock prices from zero upward, including prices outside the chart. Results use the legs entered; editing a strategy can change its risk.
How to use the short straddle calculator
Sell a call and a put at the same strike in equal quantities and with one expiration. The uncovered call has unlimited upside loss; the put can create a substantial loss if the stock falls to zero.
Understanding the payoff
Maximum profit is the combined premium received, reached at the strike. Breakevens = strike minus and plus total premium per share. Upside loss is unlimited. At a zero stock price, loss per share is strike minus total premium.
These formulas describe the standard strategy before fees. The results above include the total fees entered and are calculated from your actual legs.
Worked example
Sell a $100 call for $5 and a $100 put for $4. Maximum profit is $900, with breakevens at $91 and $109 before fees. At $120 the loss is $1,100; losses continue growing as the stock rises.
This is an expiration payoff estimate, not a live option quote or a prediction. It assumes all option legs expire together on one stock or ETF, the stock price cannot be negative, and options settle at intrinsic value. The default multiplier is 100 shares per contract; adjust it for the contract being modeled. Early assignment, exercise decisions, dividends, interest, taxes, and slippage can change realized results. Cash requirements and broker margin are separate from maximum loss. Different expirations, futures options, and adjusted contracts with non-cash deliverables are not supported.
Method: add each leg’s intrinsic value at expiration, subtract its entry cost with the correct buy/sell sign, and subtract total fees. See OIC strategy guides for further explanation.
