Every payoff diagram on this site is a picture of one fixed set of strikes. This one you can move — pick a preset or add legs one at a time, set your own strikes and premiums, and the payoff graph, break-evens, max loss and net Greeks all redraw as you go. Every strategy in the library that the model can price links straight in here.
Settlement
SPX · NDX · RUT Stocks & ETFs
SPY · QQQ · AAPL
No early assignment. Strikes step in 5s.
tap to add a leg — or drag it into the list below
Reads the trade you just built — spot, legs, IV Rank, DTE, net Greeks — and answers the questions that decide whether it is worth putting on: is the break-even window wider than the expected move? Does the credit justify the gamma risk? Are you selling cheap volatility?
A rule-based read of the numbers above, not a recommendation. It knows only what you typed in — nothing about your account, your sizing, or the market.
Reading the Two Curves
The solid line is the payoff at expiration — the classic diagram, straight segments and a kink at every strike. The dashed line is the position right now, priced with Black-Scholes at the days-to-expiry and implied volatility you set. Most diagrams leave that second curve out, and it’s the one that explains why a trade that looks safe on paper can be deeply underwater weeks before expiry.
Slide the time control toward expiry and watch the dashed line collapse onto the solid one. That collapse is theta. The volatility slider does the other half: on a short structure, adding vol pushes the dashed curve down, because the options you sold now cost more to buy back. Crush it and the curve lifts. A premium seller is structurally short vega, and this is where you can see the size of that exposure rather than read about it.
Reading the Stat Strip
Net credit or debit is what hits your account at entry, per contract, before fees. Max profit and max loss are the flat segments of the expiration curve — a naked short leg makes one of them unbounded, and the panel says “Undefined” rather than inventing a number. Break-evens are where the expiration curve crosses zero.
Reward / risk and estimated probability of profit are meant to be read together. A short iron condor lands near 0.2×, which looks terrible until you notice it wins most of the time. A 0.2× payoff at an 80% hit rate and a 3× payoff at 25% describe similar expectancies with completely different emotional textures.
What is a payoff diagram?
A payoff diagram plots profit and loss on the vertical axis against the underlying’s price on the horizontal axis, as of expiration. Flat segments mean the outcome has stopped changing — a capped max profit or max loss. Every bend sits at a strike, so counting the kinks tells you how many legs the structure has. The gallery of thirty payoff diagrams shows the fixed version of every shape you can build here.
How is an option’s breakeven calculated?
A breakeven is the underlying price at which profit and loss is exactly zero at expiration. For a long call it’s the strike plus the premium paid; for a short put, the strike minus the credit received. Multi-leg structures have no single formula — you solve for where the combined payoff crosses zero, which is what this calculator does numerically and marks with a circle on the chart.
Does this use live market data?
No. Every input is manual and every price is a model price. Each leg’s premium starts as a Black-Scholes estimate from the price, volatility, expiry and strike you entered; type over it and that leg switches to your number and is highlighted as a manual override, and the ≈ button reverts it. Real fills differ from model output — bid-ask spread, skew and slippage all move the number you actually get. Treat the output as the shape of the trade, not a quote.
Where the Model Ends
Black-Scholes assumes one volatility for every strike. Real chains don’t work that way — puts below the money carry higher implied vol than calls above it, which is why a real iron condor’s put side collects more credit than a symmetric model suggests. This calculator uses a single IV across all legs, so widely separated strikes are where it drifts furthest from reality.
It also prices European exercise. That’s right for SPX, which is cash-settled with no early assignment , and slightly wrong for share-settled products like SPY. Switching the settlement toggle makes the risk read flag the difference, but the pricing itself doesn’t model early exercise — that’s a limit of the model, not a setting.
Related Articles
- Options Payoff Diagrams: All 30 Strategies — the fixed version of every shape you can build here, grouped by market outlook.
- Options Max Loss & Max Profit: Formulas by Strategy — the arithmetic behind the numbers this calculator computes.
- Options Theta (Θ): Time Decay Curve and Formula — the mechanism behind the dashed curve collapsing onto the solid one.
- Options Vega (ν): Volatility Sensitivity — why the volatility slider moves the position at all, and how much.
This content is for educational purposes only. This calculator uses model prices, not live quotes; real fills, fees, and slippage will differ. Options trading involves significant risk of loss, and 0DTE options especially so. Always trade within your risk tolerance.