A lot of people are trading bull put spreads these days so I wanted to share my bull put spread calculator that I use to evaluate these trades.

If you click on the link below you can download my credit spread calculator that can be used for both bull put spreads and bear call spreads.

Bull Put Spreads

When trading bull put spreads (and any options strategy for that matter) it’s important to know your maximum risk and potential profits.

A bull put spread is a bullish strategy also referred to as a credit spread due to the fact that you receive option premium (a credit into your account) after placing the trade.

Generally most traders will set up their bull put spreads with out-of-the-money puts.

This means that their potential losses are more than the income they are bringing in for placing the trade, but the stock will have to decline, in some cases significantly, before experiencing losses.

Brokerages will require you to put up margin for bull put spreads.

At most brokerages, this will be equal to the amount of potential losses for the trade.

Bull Put Spread Calculator

The attached calculator will show you how much margin you will be required to come up with, but you should check with your broker on how they calculate their margin requirements.

Download the Bull Put Spread Calculator

There are two trading methodologies for placing bull put spreads – trading with the trend and swing trading.

Trading with the trend involves identifying a clear uptrend and then selling a bull put spread below recent support levels.

Trading with the trend has advantages in that you have a clear uptrend to follow and you’re not trying to pick a bottom or “catch the falling knife”.

The downside of this method is that in an uptrend volatility will be low meaning lower option premiums.

As a result, in order to generate the same amount of income from your bull put spreads, you will need to place your strikes closer to the current stock price.

When swing trading bull put spreads, you are trading against the trend and trying to (as near as possible) pick a bottom.

The advantage of this is that if a stock has been falling fast, volatility should swell meaning you can either receive a higher premium OR move further away from the current price.

Bull Put Spread Example

Let’s now look at an example of the bull put spread on SPY and see how the bull put spread calculator works.

On June 5, 2020 SPY closed at 319.15.

The July 290 puts were trading around 2.84 and the 285 puts were trading for 2.34.

Using the calculator, you enter the price of each option to see that a July 290-285 bull put spread could be sold for around $0.50 (cell C21).

If you were entering the trade in your brokerage platform as a spread, this is the price you should enter to start with as it is the mid-point of the spread.

From there you can drop your price a little depending on how urgently you feel you need to get into the trade.

Otherwise you can leg into the trade by trading each contract separately.

The bull put spread calculator also shows you the maximum loss and maximum gain in dollar terms, as well as the potential percentage return if the spread expires worthless and also converts that return to an annualized return.

Another feature is that it shows you the percentage decline to your breakeven price allowing you to have a good understanding of your risk (Cell C34).

Using the example above, all you need to enter in the calculator are the fields in green. The calculator will do the rest.


I use this calculator every time I enter a bull put spread, a bear call spread or an iron condor.

Download it and give it a go.

I hope you find it useful! As always, if you have any questions, just drop me a line.

Here’s to your ultimate success.

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