I don't know if you can see the above image well or not, but the above is a screenshot of ThinkOrSwim option analysis tool. It basically shows how my option is designed to work and where I'm at.
The red line shows the P/L at the expiration. I sold NG Feb 3 put for 0.125 so my break-even is about 2.875 and my max profit is +$1250 taking all the premium. The white line shows the relationship between options and my P/L TODAY. For example, if the options drops to 2.95ish, I'm about b/e. If it drops to 2.875 today (I hope not), then I'm -$522. If the market doesn't move until the expiration, the while line should shift to right everyday.
Now I put an order to buy back this option in case it just shoots up since the profit is limited. What's nice about TOS is it shows what the underlying price will be in regards to options price. In other words, if I place to buy back the 3 put at 0.5, this graph will show that the price of the underlying futures has to go up to 3.1 or something like that.
You can do this in your head, but it's certainly a very nice tool.
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