optionRuler simulator is easy to use. Now we will see it ...

1 - First you have to enter the price of the FTSE MIB that you want to use for your strategy

You can change the price as you want in order for you to try out different scenarios

2 - Then select the expiration date you are interested in

You can choose between the three closest expiration dates

3 - Now, just set the STRIKE PRICES (CALL or PUT) of your strategy

Choose the STRIKE (CALL or PUT)
enter the quantity:
+1 = buy 1 contract
-3 = sell 3 contracts.
If you click on ENTER your order will be executed at the market price.

Let’s suppose you have entered:
1- buy 1 CALL at 18,000
2- sell 1 CALL at 20,000
3- buy 1 CALL at 22,000

If you click on the chart icon you can graphically see the PayOff at the expiration day

Here is the Payoff chart.
Maybe you wanted a Butterfly instead?

Simply change the number of contracts in the strategy settings

Just increase the short position from -1 to -2

Let's do a graphical check.

Here is the butterfly!