Put Ratio Backspread Calculator

Put Ratio Backspread at a glance

How a put ratio backspread works

A put ratio backspread pairs a bull put spread with an extra long put. You sell one at the money put and buy two cheaper puts two strikes lower, so the structure can cost a small debit or bring in a small credit, depending on strike spacing and skew. One long put covers the short put. The second long put has nothing offsetting it on the downside, which is what produces large gains if the stock falls hard.

At expiration the payoff has a valley at the lower strike. Above the short strike, all three puts expire worthless and you keep the credit or lose the debit. Between the strikes, the short put loses value as the stock falls while the long puts are still worthless, so the loss is largest at the long strike. Below it, the two long puts gain twice as fast as the short put loses, and profit grows until the stock reaches zero, which caps the maximum gain.

Before expiration the position is net long options, so it pays time decay and benefits from rising implied volatility. That suits declines, which often bring volatility spikes in equities. A fast drop early in the trade can make the position profitable before expiration, even above the expiration breakeven, because the long puts gain delta quickly. A slow grind lower that ends near the long strike is the worst case.

Put Ratio Backspread example with real numbers

With the stock at $100, implied volatility at 30%, a 4.1% risk free rate and no dividend, you would sell 1 100 put (32 days) at $3.39, buy 2 95 puts (32 days) at $1.43. That is a net credit of $53. At expiration a maximum profit of $9,053 and a maximum loss of $447, with breakevens at $90.53 and $99.47. The lognormal chance of profit is 66%.

These are theoretical American option prices from the Bjerksund and Stensland model, not live quotes. Load any ticker in the put ratio backspread calculator above to run the same math on real market prices.

When to use a put ratio backspread

• You expect a sharp decline, for example on a catalyst or in a broad selloff, and want large downside gains.
• You want a bearish hedge that costs little or brings in a credit.
• Implied volatility is low and you expect it to rise as the stock falls.
• You want little or no loss if the stock rallies instead.

Max profit, max loss and breakeven

Maximum profit

Two times the long strike minus the short strike, plus the net credit or minus the net debit, times 100, reached if the stock falls to zero. It is large but limited because the stock cannot go below zero.

Maximum loss

Short strike minus long strike, minus the net credit or plus the net debit, times 100. It occurs if the stock closes exactly at the long strike at expiration.

Breakeven

Lower breakeven equals the long strike minus the strike width, plus the net credit or minus the net debit. An upper breakeven exists only for a credit trade and equals the short strike minus the net credit; a debit trade simply loses the debit above the short strike.

Put Ratio Backspread Greeks

• Delta: Delta at entry is near flat, slightly positive or slightly negative depending on strike spacing, and it becomes strongly negative as the stock falls past the long strike.
• Gamma: Gamma is positive because you own two puts for every one you sell, and it peaks near the long strike late in the trade.
• Theta: Theta is negative, most of all near the long strike, so time works against you if the decline is slow.
• Vega: Vega is positive, so a rise in implied volatility during a selloff helps and a volatility drop hurts.

See the live numbers for your position in the Greeks tab of the calculator, or explore a single option in the options Greeks calculator.

Early exercise and assignment risk

The short at the money put is the leg that can be assigned early. If the stock falls well below it, which is exactly what the trade wants, the short put becomes deep in the money, and an American put holder may exercise once its time value is small, especially when interest rates are higher. Assignment means buying 100 shares at the short strike. You still hold two long puts at the lower strike, so one protects those shares and the other keeps the downside profit intact.

Long stock plus a long put works like a long call, and your second put remains, so the position keeps defined risk. You can sell the shares and keep both puts, or close everything to lock in gains. Dividends make put holders likely to wait until after the ex dividend date, so assignment risk usually rises after that date rather than before it. If you prefer to avoid stock entirely, close or roll the short put once it is deep in the money with little time value.

The calculator's Early exercise risk tab flags short legs that are likely to be assigned. For a single option, use the early exercise calculator or read how early exercise and assignment work.

Pros and cons

How to manage a put ratio backspread

• Time the entry close to the expected catalyst so time decay has less room to work against you.
• If the stock drops sharply, consider selling one of the long puts to lock in a gain while keeping the rest of the position.
• If the stock settles near the long strike late in the cycle, close or roll rather than hold into the maximum loss.
• Watch the short put after a big drop and close or roll it if assignment would leave you with unwanted shares.

Put Ratio Backspread FAQ

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Educational tool, not financial advice. Calculations are theoretical and depend on your inputs; real fills, fees, early assignment and dividends can change results. Options involve risk and are not suitable for every investor.