Tools / Debit spread calculator

Debit spread calculator

A vertical bought for a debit, with calls or puts: the cost, the most it can make, the breakeven and the reward against the risk.

Only for the model probability at expiry.
Cost
$380.00
Width
$10.00
Max profit
$620.00
Max loss
-$380.00
Breakeven at expiry
$103.80
Reward to risk
1.63 to 1
max profit / max loss
Profit or loss at expiry
-$250$0$250$500 Now $100Breakeven $103.80$95$100$105$110$115 Price at expiry
The chart as numbers
Price at expiryProfit or loss at expiry
$91.20-$380.00
$100.00-$380.00
$103.80-$0.00
$110.00$620.00
$118.80$620.00
A calculator shows the plan. Your broker export shows what happened: drop it into FillStub and every contract's life is rebuilt, rolls, assignments and expiries included, with the real profit or loss of each structure.
Track the real result of this trade

How it is calculated

Max loss = debit x 100 x contracts
Max profit = (width - debit) x 100 x contracts
Breakeven = long strike + debit (calls), long strike - debit (puts)
Reward to risk = (width - debit) / debit

A debit spread buys one option and sells a further out of the money one of the same type and expiry. The sold option pays for part of the bought one and caps the gain at the width between the strikes.

The most it can lose is what it cost. At expiry it is worth the full width beyond the short strike and nothing short of the long strike, with a straight line between.

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Every price here is one you typed; nothing is fetched and nothing is stored. The numbers travel in the address of this page, so a result can be linked to. Results are at expiry for one structure, before commissions and fees, and assume no early assignment. An illustration of the arithmetic, not advice.