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Days to Expiry

Put Spread Calculator

Calculate Max Profit, Max Loss & Probability of Success

Confused by put spread math? Can't figure out your max profit and breakeven? Our calculator shows your complete risk/reward picture—max profit, max loss, breakeven, probability of profit, and short-leg assignment risk—instantly.

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Find Put Credit Spread Opportunities

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Problem

Put Spread Math is Intimidating

Two Different Strikes, Two Different Outcomes — Impossible to track mentally

Max Profit is Hidden in the Spread Width — You don't know if it's worth your time

Breakeven is Counterintuitive — Not the same as your short strike

Assignment is Confusing — You don't know what happens if stock crashes

Solution

Put Spread Calculator

Simple Max Profit / Max Loss Summary

One Clear Breakeven Point

Short-Leg Assignment Risk

Estimated from the short put's delta

Payoff Diagram at Expiration

Probability of Profit

Estimated from distance to breakeven vs. implied volatility

Risk/Reward Ratio

Is this trade worth it?

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How it works

Get started in 3 simple steps

1

Pick Your Symbols and Expiration Window

Enter tickers and a days-to-expiration range to scan

2

Scan Live Put Spreads

Each short put (what you're selling) is paired with a long put (your protection floor) and priced from the live option chain

3

Review Your Risk/Reward

See max profit, max loss, breakeven, and whether the risk/reward ratio is worth it

Key Metrics

Example: Max Profit ($1.00 credit)

$100

Example: Max Loss ($5-wide spread)

$400

Example: Breakeven ($575 short put)

$574

Example: Return on Risk

25%

Frequently Asked Questions

Everything you need to know about getting started

What's a put spread?

You sell a put option (collect premium) and buy a lower-strike put (pay premium, cap your loss). Why? You want income but limited risk if stock crashes too much.

How is breakeven different from my short strike?

Short strike ($240) is where you get assigned. Breakeven ($239) is where you start making profit. You collected $1 premium, so breakeven is $1 below your short strike.

What does "assignment probability" mean?

How likely your short put gets assigned (stock falls below your short strike). 20% = 1 in 5 times. The calculator estimates it from the short put's delta.

Can I make money if stock drops?

Yes, as long as it stays above your breakeven at expiration. Below breakeven you lose money, but your long put caps the loss at the spread width minus the credit.

Should I close before assignment?

Many traders close at 50-75% max profit to free up capital and reduce risk.

Ready to Get Started?

Join traders who are already using our tools to make better decisions.