The three numbers that define any option trade
Before you place an option order, you should be able to say three things out loud: the most this trade can make, the most it can lose, and the price the stock has to reach for you to break even. Those three numbers describe the entire risk profile. If you cannot state them, you do not understand the position yet, and the market is not the place to find out.
One rule sits underneath all of the math: one contract controls 100 shares. A premium quoted as $3.00 is $300 of real money per contract. Keep that multiplier in front of you and the rest of the numbers stay honest.
Long call: capped loss, open-ended upside
When you buy a call, you pay a premium for the right to buy the stock at the strike. Your max loss is that premium and nothing more, because the worst case is the option expires worthless. Your max profit is unlimited, since the call gains value as the stock climbs with no ceiling. You break even at the strike plus the premium you paid, not at the strike itself.
Say you buy the 105 call for $3.00. Your max loss is $300 per contract, the whole premium. You break even at $108, because the stock has to clear the strike and pay back your $3.00 first. Above $108 the profit is open-ended: at $115 the call is worth at least $10.00, a $700 gain on the $300 you risked.
Long put: capped loss, profit down to zero
A long put is the mirror image. You pay a premium for the right to sell at the strike, so you profit when the stock falls. Your max loss is again just the premium. Your max profit is the strike minus the premium, the value you collect if the stock rides all the way down to zero. Breakeven is the strike minus the premium.
Buy the 100 put for $2.50 and your max loss is $250. You break even at $97.50, and your max profit is $9,750 per contract, which is the full $100 strike minus the $2.50 premium, times 100, if the stock went to zero. That extreme almost never happens, but it frames the ceiling on the trade.
The formulas, side by side
- Max loss = premium paid
- Max profit = unlimited
- Breakeven = strike + premium
- Max loss = premium paid
- Max profit = strike − premium
- Breakeven = strike − premium
All figures are per share. Multiply by 100 for the per-contract dollar amount.
Covered calls and cash-secured puts
A covered call is for stock you already own. You hold 100 shares and sell one call against them, collecting the premium up front. In exchange, you cap your upside at the strike. Your max profit is the strike minus your cost basis, plus the premium, times 100. Your downside is still the stock's downside, but the premium you took in cushions the first part of any decline.
A cash-secured put is the setup for stock you want to own. You sell a put and hold enough cash to buy the shares if you are assigned. Your max profit is the premium you collected, full stop. If the stock drops below the strike you are obligated to buy at that strike, so your breakeven is the strike minus the premium. Both trades are income strategies: you are getting paid to accept a defined obligation.
Why vertical spreads cap both sides
A vertical spread means buying one option and selling another of the same type and expiration at a different strike. Take a call debit spread: you buy a lower-strike call and sell a higher-strike call. Selling that second option pays for part of the one you bought, which lowers your cost, but it also puts a ceiling on your gain. That is the trade-off, and it is why defined-risk spreads are so popular.
Your max loss is the net debit you paid, and nothing more. Your max profit is the width of the strikes minus that net debit. Buy the 100 call and sell the 105 call for a net debit of $2.00, and the width is $5.00. Your max loss is $200 per contract, your max profit is $300, and both numbers are known the moment you enter. No open-ended risk, no open-ended reward, just a fixed box.
Buyers, sellers, and why breakeven includes the premium
The dividing line in options is who paid and who got paid. Buyers have defined risk, the premium, and they pay theta, the daily cost of time decay working against them. Sellers collect that premium up front but take on larger or, in the naked case, undefined risk. Neither side is free money; each is a different trade-off between cost, probability, and the shape of the payoff.
This is also why breakeven always folds in the premium. You paid for the contract, so the stock has to move enough to earn that cost back before you see a dollar of profit. A call needs the stock to clear the strike plus the premium; a put needs it to fall below the strike minus the premium. Skip that adjustment and you will misjudge every trade you take.