Bull put spread calculator built live in Excel, 5 inputs that define your risk

About this tutorial

Bull put spread calculator setups are one of the most misunderstood parts of options income trading, and most retail traders size them wrong before they ever place the order. This live session walks through building a fully functional bull put spread calculator inside Excel using MarketXLS real-time options data, so you can see exactly what you are risking and what you stand to collect before you commit a single dollar. What you will see: - Pulling live bid and ask prices for both the short put and the long put legs using MarketXLS options chain functions, so the net credit updates automatically as the market moves - Calculating max profit, max loss, and breakeven price with simple cell formulas tied directly to the live premium data, not static numbers you type in by hand - Building a payoff diagram inside Excel that redraws in real time as the underlying price changes, giving you an instant visual of the spread's risk profile at expiration - Layering in a position-sizing column that takes your account size and a user-defined max-risk percentage and outputs the exact number of contracts you can trade without overexposing the portfolio - Comparing two or three different strike combinations side by side on the same sheet, so you can see how moving the short strike closer to or further from the money changes the probability of profit and the credit received - Adding a delta and implied volatility pull for each leg so you can judge whether the spread is being opened in a high-IV environment where premium collection actually makes sense Why this matters: a bull put spread caps both your gain and your loss, which sounds clean on paper, but the real danger is entering a spread where the credit collected is too small relative to the capital at risk. Most traders focus on the premium and ignore the max loss column entirely. When you see both numbers updating live, side by side, driven by actual market quotes, the trade either justifies itself or it does not. There is no guessing. The calculator also makes it easy to stress-test the position: if volatility drops after entry, what does the spread look like marked to market halfway to expiration? The sheet answers that question with a single input change, which is exactly the kind of pre-trade homework that separates disciplined options sellers from traders who wonder why a winning trade turned into a losing one. Built live in Excel with MarketXLS real-time options data during this broadcast. Download the template and get a free MarketXLS trial at marketxls.com.