How do you calculate a vertical spread breakeven?

For bull put and bear put spreads, subtract the credit or debit from the relevant short or long strike. For bear call and bull call spreads, add it to the relevant short or long strike.

Does the calculator predict profit before expiration?

No. It calculates expiration payoff boundaries from the entered net price. Before expiration, the spread's quote also reflects time value, implied volatility, interest rates, and the live bid-ask market.

Vertical Spread Calculator: Max Profit, Max Loss, and Breakeven

Q: How do you calculate max loss on a credit spread?

For one standard contract, subtract the net credit from the strike width and multiply by 100. Fees and fill differences are not included.

Q: How do you calculate max profit on a debit spread?

For one standard contract, subtract the net debit from the strike width and multiply by 100. The debit itself is the maximum loss.

By VantureCap · Published July 30, 2026 · 7 min read

Learning path · Lesson 15 of 350 of 35 complete

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Enter a spread type, the relevant strike, width, and net premium. The calculator returns the four expiration numbers every vertical-spread order should show: maximum profit, maximum loss, breakeven, and reward-to-risk.

Calculate one vertical spread

Spread type Short put strike Strike width, points Net credit, points

One contract, $100 multiplier, expiration payoff. Fees, commissions, slippage, and early closing value are excluded.

Max profit$600

Max loss$4,400

Breakeven5,994.00

Reward / risk0.14 : 1

The two formulas behind every result

Credit spread

Max profit = credit × $100

Max loss = (width − credit) × $100

Debit spread

Max loss = debit × $100

Max profit = (width − debit) × $100

The net premium must be smaller than the width for a conventional vertical entered at a valid price. A 50-point spread cannot produce more than $5,000 of total expiration value per contract.

Breakeven formulas by spread type

Spread	Relevant strike	Expiration breakeven	Maximum profit begins
Bull put credit	short put	short put − credit	at or above short put
Bear call credit	short call	short call + credit	at or below short call
Bull call debit	long call	long call + debit	at or above short call
Bear put debit	long put	long put − debit	at or below short put

Breakeven is an expiration line. Before expiration, remaining time value and implied volatility affect the two-leg closing quote. SPX touching breakeven during the trade does not force the package to show exactly $0 P&L.

Worked credit-spread example

Sell the 6,000 put, buy the 5,950 put, and collect 6.00 points = $600. The spread is 50 points wide.

max profit = 6.00 × $100 = $600
max loss = (50 − 6.00) × $100 = $4,400
breakeven = 6,000 − 6.00 = 5,994.00

The ratio is $600 / $4,400 = 0.14. That is not a probability and not a forecast. It only compares the fixed expiration reward and risk at the entered price.

Worked debit-spread example

Buy the 6,000 call, sell the 6,025 call, and pay 9.50 points = $950. The width is 25 points.

max loss = 9.50 × $100 = $950
max profit = (25 − 9.50) × $100 = $1,550
breakeven = 6,000 + 9.50 = 6,009.50

What this calculator does not tell you

Fill quality: use the actual package credit or debit, not a hoped-for midpoint.
Probability: max profit and max loss do not say how likely either outcome is.
Path risk: a defined max loss can still be uncomfortable long before expiration.
Position size: multiply max loss by contracts, then compare it with the account.
Settlement details: confirm whether the SPX series is A.M.- or P.M.-settled.

Vertical-spread calculator FAQ

How do you calculate max loss on a credit spread?

Subtract the net credit from width, then multiply by $100 per standard contract.

How do you calculate max profit on a debit spread?

Subtract the debit from width, then multiply by $100.

How do you calculate breakeven?

Add premium on call spreads and subtract it on put spreads, using the short strike for credits and the long strike for debits.

Does this predict profit before expiration?

No. It calculates expiration boundaries; a live closing quote includes remaining time value, IV, and the bid-ask market.

Authoritative references

Practice sizing a defined-risk spread →10 free rounds a session · real market history · no signup

Keep learning

Practise this on real history: the trainer deals these structures on seventeen decks, and every one has a page showing how they actually settled — SPX, SPY, TSLA and GLD among them. The same structure behaves differently on an index than on a single stock, which is easier to see side by side than to be told. Compare the decks.

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Next lessonReading market context

Playbook Trainer is an educational game built on historical market data. Nothing on this page is investment advice or a recommendation to trade. Options involve substantial risk; defined-risk spreads can lose their full maximum loss. Scenario dates are masked, and prices reflect historical option quotes with simplified fills.