# Call Spread Calculator - Bull Call & Bear Call Source: https://theoptionsbench.com/call-spread-calculator/ > Plain-text mirror for AI/LLM ingestion. Canonical HTML page: https://theoptionsbench.com/call-spread-calculator/ --- Call vertical spread - key facts A call vertical trades two calls at different strikes: buy the lower for a bullish debit spread, or sell the lower for a bearish credit spread - both with defined risk. Max profit Bull call (debit): (width - net debit) × 100. Bear call (credit): net credit × 100. Max loss Bull call: net debit × 100. Bear call: (width - net credit) × 100. Breakeven Lower strike + the net debit (bull) or net credit (bear), per share. Return on risk Max profit ÷ capital at risk. Want the full explanation? Read What is a Call Spread? . How to set it up Outlook: As an income seller you run the Bear Call (credit) version: neutral-to-bearish, betting the stock stalls below a level, and you want elevated implied volatility so the premium you collect is fat. Ideal DTE 30-45 days is the income-seller default - long enough that theta does real work, short enough that you're not married to a guess. Go shorter only when you want decay to bite fast and you'll accept the gamma near expiry. Strike selection Sell the short call around 0.30 delta - delta is a rough proxy for the odds, so that's roughly a 70% chance it finishes worthless, not a guarantee - and buy the long call $5-$10 higher to cap the loss. A lower-delta short strike (~0.20) wins more often for a smaller credit; a higher-delta one (~0.40) pays more but sits closer to the money. Keep the short strike above a real level - a prior high or resistance. Enter when Sell the credit spread when IV Rank is elevated (the common cut is above 50) so you're paid richly for the range you're selling. Selling premium into cheap IV is picking up pennies in front of the same steamroller - check the IV Rank Calculator first. Take profit Close the Bear Call once you've kept about 50% of the credit. On a vertical the zone is wide enough that 50% is the right line; the last half of a short premium trade grinds out slowest for the most risk. Manage / exit Roll or close near 21 DTE, or sooner if the stock pushes up through your short strike. A tested short call going in-the-money - especially before an ex-dividend date - invites early assignment; don't white-knuckle it to expiration. Use it when: You expect a stock to stall or drift below a clear resistance level, IV is rich, and you want defined-risk income with time decay on your side rather than betting on a move. Skip it when: Skip the Bear Call credit in a strong uptrend; if you actually expect the stock to climb, run the Bull Call debit version of this same spread instead of selling premium against it. Starting points, not rules - the conventions experienced sellers reach for first. Your account, thesis and risk move every number here. See every strategy's setup -> ## How to use this calculator - Enter the current share price and days to expiration. - Enter the long call you buy - its strike and the premium paid. - Enter the short call you sell - its strike and the premium received. - Set the number of contracts - the calculator detects a bull call (debit) or bear call (credit) spread from the strike order. - Read the result: net debit or credit, max profit, max loss, breakeven, and return on risk. **What it tells you:** the capped profit, loss, and breakeven of a vertical call spread before you place it. ## How this calculator works A call spread has two legs in the same expiration: a call you **buy** and a call you **sell** at a different strike. Which strike you buy decides everything. Buy the lower strike and sell the higher one and you have a **bull call (debit) spread** - you pay a net debit and want the stock to rise. Sell the lower strike and buy the higher one and you have a **bear call (credit) spread** - you collect a net credit and want the stock to stay below your short strike. Enter both strikes and both premiums and the calculator detects the type from the strike order, then returns the numbers that define the trade. Because the payoff is a straight line that bends only at the strikes, the most you can make and the most you can lose both sit at the ends - the calculator reads them off those corners, so the figures hold for either type. **Max profit** and **max loss** are each capped by the long leg. **Breakeven** is the lower strike plus the net debit or credit per share. **Return on risk** is max profit ÷ capital at risk, with an annualized version that scales it by 365 ÷ days to expiration. ## Bull call vs bear call A **bull call spread** is a directional bet you pay for: the net debit is your max loss, and you profit as the stock climbs toward the higher strike, capped at the strike width minus the debit. It needs the move to actually happen, and time decay works against you. A **bear call spread** is premium you sell: the net credit is your max profit, kept when the stock stays at or below the lower (short) strike, and your loss is capped at the width minus the credit. Time decay works for you, and you do not need the stock to move at all - only to stay below your strike. ## Worked example A fixed, hypothetical illustration - not live market data. A hypothetical stock trades at $100. With 30 days to expiration you buy the $100 call for $5.00 and sell the $110 call for $2.00 - a bull call spread for a net debit of $3.00 per share. - Net debit: $3.00 × 100 = $300 per contract (your max loss). - Strike width: $110 - $100 = $10. - Max profit: ($10 - $3) × 100 = $700, if the stock is at or above $110 at expiration. - Breakeven: $100 + $3.00 = $103. - Return on risk: $700 ÷ $300 ≈ 233% over 30 days. Found this useful? Get the bi-weekly email Strategy breakdowns, the edge cases these calculators surface, and trades worth watching - free, no noise. Join the free email -> ## ⚠ Common mistakes - Confusing the debit and credit versions. Buying the lower strike pays for an upward move; selling the lower strike collects premium for the stock staying put. They are opposite trades built from the same two calls. - Paying too much for a debit spread. If the net debit approaches the strike width, the most you can make shrinks toward zero - you are paying nearly the full payoff up front. - Forgetting time decay. A bull call spread loses value as expiration nears unless the stock moves; a bear call spread gains from that same decay. - Ignoring early assignment. A short call that goes in-the-money - especially before an ex-dividend date - can be assigned early, leaving you short stock. - Misreading the annualized return. A few-week spread can annualize to triple or quadruple digits; that is arithmetic, not an expected compounding rate. ## Frequently asked questions What is a call spread? A call (vertical) spread buys one call and sells another at a different strike, same expiration. Buy the lower strike and sell the higher for a bull call (debit) spread - you pay to open it and profit if the stock rises. Reverse it for a bear call (credit) spread - you collect a credit and profit if the stock stays below your short strike. The second leg caps both cost and risk. What is the difference between a bull call and a bear call spread? They are mirror images of the same two calls. A bull call spread is a net debit: buy the lower-strike call and sell the higher one, betting the stock rises. A bear call spread is a net credit: sell the lower-strike call and buy the higher one for protection, betting the stock stays below the strike you sold. The calculator detects which you entered from the strike order. How is max profit on a bull call (debit) spread calculated? Max profit = (strike width - net debit) × 100 per contract, reached when the stock finishes at or above the higher (short) strike so both calls are in the money. Max loss is just the net debit you paid, reached when the stock finishes at or below the lower (long) strike and both calls expire worthless. What is the breakeven on a call spread? For both types the breakeven is the lower strike plus the net debit or credit per share. For a bull call spread that is the long strike plus the debit; for a bear call spread it is the short strike plus the credit. At that price the position is exactly flat at expiration. Call spread vs put spread - which should I use? They express the same bullish view from opposite sides, both with defined risk. The bull call spread (debit) costs money up front and profits as the stock rises; the bull put spread (credit) pays you up front and profits if the stock simply holds above your short strike. Pick the credit spread to sell premium and let time decay work for you; pick the debit spread to pay for a directional move. Why is the annualized return so high? Annualized return scales the return on risk by 365 ÷ days to expiration, so a short-dated spread extrapolates a few weeks across a whole year and produces a very large percentage. Debit spreads, whose max profit can exceed the capital at risk, look especially large. Treat it as a way to compare trades of different lengths, not a return you should expect to compound. When should I use a call spread? When you have a directional view but want to cap both cost and risk. Buy a bull call (debit) spread when you expect a move up and want cheaper, defined-risk exposure than a long call; sell a bear call (credit) spread when you expect a stock to stay below a level. Skip the debit spread if you expect an explosive move, since the short strike caps upside; skip the credit spread in a strong uptrend.