🧮 Payoff & Greeks Calculator

Build any position one leg at a time and watch its profit/loss diagram, breakeven, max profit and loss, probability of profit, and the Greeks update live. Everything runs in your browser — nothing is sent anywhere.

Manual or live data Live BTC chain · Deribit Black-Scholes (European) Educational only

Live BTC chain — Deribit free · no login

Pull real Bitcoin option prices, strikes and implied volatility straight from Deribit's public API — then tap any price to drop it into your position.

Market

Underlying price $

Volatility % (IV)

Days to expiry

Contract size

Advanced

Interest rate %

Legs prices follow the model; type to override

Presets

From the course — 10 BTC hedges

Net cost

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Max profit

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at expiration

Max loss

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at expiration

Breakeven

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Prob. of profit ⓘ

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Profit / loss at expiration

At expiration Selected outlook Profit Loss ● Breakeven

OutlookToday

Net Greeks whole position, at today's price

How to read this: the solid line is your position's profit or loss at expiration across underlying prices; the dashed line is its value today (drag the Outlook slider toward expiry to watch time decay). Prices auto-fill from a Black-Scholes estimate using your volatility — overwrite any leg's price with a real market quote, or use the Live BTC chain to pull real Deribit prices and implied volatility (converted from BTC to USD). This tool assumes one shared expiry and European-style exercise (which matches Deribit's BTC options). Live data needs the site served over http://localhost rather than opened as a file. It's for learning, not trading advice.