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Long call calculator
breakeven, and the cost of being right slowly

Buying a call is the simplest bullish options position: you pay a premium for the right to buy at the strike. Your loss is capped at what you paid, and your upside has no ceiling. What the payoff diagram does not show is that most long calls expire worthless — you need the stock above your breakeven, and you need it there before time runs out.

Outlook: Bullish

Max profit
—
best case at expiry
Max loss
—
worst case at expiry
Breakeven
—
where the trade turns even
Net debit / credit
—
to open the position
Your long call
Per-share premiums. One contract = 100 shares.
100 shares per contract
Profit at expiry Loss at expiry Breakeven Strikes & spot

How a long call pays

Breakeven = strike + premium paid Max loss = premium paid × 100 × contracts (capped) Max gain = unlimited P/L at expiry = (max(0, price − strike) − premium) × 100 × contracts
Worth naming. The capped loss makes long calls feel safe, and per trade it is. The risk is repetition: a string of small, fully-lost premiums adds up faster than most people track, precisely because each individual loss looked affordable.

What this does not model

Every figure here is the payoff at expiry. Before then your position is marked at market prices that still carry time value, so a trade can show a loss while sitting exactly where you wanted it — falling implied volatility alone will do that.

For the live version — real Greeks, current marks and what-if scenarios against actual chain data — that is what the GreeksView desk does, in your browser, on your own broker keys.

Frequently asked questions

What is the breakeven on a long call?
The strike plus the premium you paid. Buy the 100 strike for $4.00 and you break even at $104.00 — below that at expiry, the trade loses money even if the stock rose. This is why buying calls on a stock you expect to drift up slightly often loses: the move has to clear the premium too.
How much can I lose on a long call?
The premium, and nothing more. Buying one contract at $4.00 risks $400 total, no matter how far the stock falls. That is the defining feature of a long option — your downside is known and paid up front.
Why did my call lose money when the stock went up?
Most often time decay, falling implied volatility, or both. If the stock rose but stayed below your breakeven, or rose after volatility collapsed post-earnings, the option can be worth less than you paid despite the direction being right. Direction is only one of three things that price an option.
Why does my broker show a different number than this calculator?
Because you are comparing a mark-to-market value against an expiry value. Until expiry your options still carry time value, and your broker prices them at what the market will pay right now. Time passing, or implied volatility falling, can show a loss on a position that would be profitable if expiry were today.
Are commissions included in these numbers?
No — every figure is gross. On multi-leg positions this matters more than people expect: four legs to open and four to close is eight commissions against what may be a couple of hundred dollars of credit. Check your broker's per-contract rate against the max profit shown here before deciding a trade is worth putting on.

Run this against a live chain

GreeksView builds positions from real option chains with live Greeks, gamma exposure and what-if scenarios — in your browser, on your own broker keys.

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Educational tool only — not investment advice, and not a recommendation to enter any position. Options involve substantial risk and are not suitable for every investor. Figures are theoretical, exclude commissions and taxes, and assume the position is held to expiry. GreeksView is not a broker and does not hold funds.