Pick a contract, drag the date and price sliders — profit or loss at any price on any date, drawn as a heatmap. Quotes come from the live option chain.
Saving needs a free account — pick up where you left off.
Convention: P&L is shown per contract (100 shares) — the real-money number; prices are per share. Quotes use the chain’s bid/ask midpoint; real fills are usually a bit worse.
Model: Black-Scholes with a zero risk-free rate. Volatility is not taken from the data vendor but backed out of the contract’s own midpoint, then held constant across the grid — so the “today at spot” cell reads exactly $0, and today’s breakeven equals the spot price.
Error grows outward from that anchor: real IV moves with time and price (especially around earnings), a multi-leg position can only anchor on one contract, and the deep in-the-money rows lose some time value to the zero-rate assumption. The further from “today at spot”, the less reliable — except the expiry column, which is pure intrinsic value and does not depend on volatility at all.
Data: delayed quotes (~15 min). For education only; not investment advice.