Options Spread Calculator

Compare expiry payoff, break-even, max gain, and max loss for common call and put vertical spreads from two strikes, two premiums, fees, and contract size.

Vertical spread payoff planner Compare debit and credit verticals at expiry from two strikes, two premiums, contract size, and fees. This version stays deliberately focused on same-expiry vertical spreads rather than calendar or diagonal structures.

Spread type

Enter the premium for the lower-strike long call and the higher-strike short call.

Display currency

Switch the money display without changing the spread assumptions.

Result

$708.00

Bull call debit spread profit or loss across 2 contracts if the underlying expires at $108.00.

Net debit
$880.00
Break-even price
$104.46
Max profit
$1,108.00
Max loss
$892.00

Expiry at lower strike

-$892.00

$100.00 scenario.

Entered expiry price

$708.00

$108.00 scenario.

Expiry at upper strike

$1,108.00

$110.00 scenario.

Entered expiry price is in the profit zone This bullish vertical spread needs the underlying to finish above $104.46 after fees to remain profitable at expiry.

Planning note

Spread width is $10.00 per share. The lower leg is long call at lower strike and the upper leg is short call at higher strike. Maximum reward equals 124.22% of maximum risk.

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Vertical Spreads

Options spread calculator guide: vertical spread payoff, break-even, and capped risk

An options spread calculator helps you see how two option legs interact once they share the same expiry and underlying. This version is deliberately focused on vertical spreads, where the strike prices differ but the expiry stays the same. That makes it easier to compare the trade-off between lower entry cost, capped upside, collected credit, and capped downside without drifting into the more complicated pricing behaviour of calendar or diagonal structures.

What this spread calculator is measuring

This calculator measures the expiry payoff of four common verticals: bull call debit spreads, bear call credit spreads, bull put credit spreads, and bear put debit spreads. Each structure combines one long option and one short option of the same type. Because the long and short strikes are different, the payoff is capped on both the reward side and the risk side.

That capped structure is the main reason many investors use verticals. A debit spread reduces upfront premium compared with a single long option, while a credit spread defines risk compared with a naked short option. The payoff is still directional, but the range of outcomes is easier to map because the maximum gain and maximum loss can be solved directly from spread width, net premium, and fees.

How net debit, net credit, and spread width work together

A debit spread costs money to enter because the premium paid for the long leg is larger than the premium collected on the short leg. A credit spread is the reverse. The collected premium from the short leg exceeds the cost of the long leg, so cash comes in up front. In both cases, spread width matters because it determines the maximum intrinsic-value difference the two strikes can create at expiry.

For a vertical, the final risk and reward picture is straightforward. Debit spreads can lose no more than the upfront debit plus fees, while credit spreads can gain no more than the upfront credit minus fees. The other side of the trade is controlled by strike width. That is why a spread calculator should show not just the entered expiry profit, but also the width, break-even, and the capped edges of the payoff.

Spread width = Higher strike - Lower strike

Measures the maximum intrinsic-value gap between the two vertical spread legs at expiry.

Debit spread max loss = Net debit paid + Fees

Shows the defined-risk cash amount at stake when the spread is opened for a net debit.

Credit spread max loss = Spread width - Net credit received + Fees

Shows the defined-risk amount still exposed after the upfront credit is collected.

Why break-even is different for debit and credit spreads

A bull call debit spread needs the underlying to finish above the lower strike plus the net debit per share to overcome its upfront cost. A bear call credit spread works in the opposite direction. It can stay profitable as long as the underlying finishes below the lower strike plus the retained credit. Put spreads follow the same logic, but the break-even level is measured from the upper strike instead.

This matters because a spread can still be directionally correct and underperform. A bullish spread may benefit from a rising stock, but if the rally is too small to clear break-even after fees, the trade can still finish at a loss. The break-even line is therefore often more practical than the raw strike levels when you are stress-testing a planned spread.

What this vertical spread planner does not cover

This calculator deliberately excludes calendar spreads, diagonal spreads, early assignment risk, implied volatility changes, before-expiry mark-to-market pricing, and broker margin treatment. Those topics require time-value modelling and can no longer be reduced to a clean expiry-only payoff. If you need pre-expiry theoretical pricing, use the Black-Scholes and single-leg options tools alongside this spread planner.

Use this calculator as a defined-risk payoff tool only. Real spread trading can still involve execution slippage, borrow constraints, assignment risk on the short leg, and account-specific margin or options-approval rules that are not represented in this simplified expiry payoff.

Further reading

Frequently asked questions

Why does a spread have both a maximum gain and a maximum loss?

Because one option leg limits the other. The short leg caps the upside of a debit spread, and the long leg caps the downside of a credit spread, creating a defined-risk payoff on both sides.

 Why is this calculator limited to vertical spreads?

Because verticals can be modeled cleanly from expiry payoff alone. Calendar and diagonal spreads depend much more on time value and implied volatility before expiry, so they need a different pricing framework.

 Can a bullish spread still lose money if the stock rises?

Yes. If the move is not large enough to clear the spread's break-even level after fees, the position can still finish at a loss even though the direction was broadly correct.

 Does this include early assignment risk on the short leg?

No. The calculator is an expiry payoff planner only. Early assignment and exercise timing can materially change the real-world outcome of a spread trade.

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