Calculators
The numbers, instantly.
Four quick calculators for the things you'll work out on every trade. Want to see the whole payoff curve? Head to the payoff playground.
Break-even
The price a single long option needs to reach at expiry to cover its cost.
Break-even$105.00
Profit & loss
Dollar result of closing a position (×100 shares per contract).
P&L$150
Position sizer
How many contracts keep your worst case within your risk budget.
Max contracts0
Probability of profit
A simplified estimate of finishing past break-even (uses IV & days to expiry).
Est. PoP18.5%
Figures are per share unless stated; one contract controls 100 shares. The probability estimate is a simplified lognormal model for learning, not a guarantee.