Would love some help with figuring out my ROI on a FB ad. (also posted in r/marketing)

Hello, I asked this question in /r/marketing but thought you all might have some insight into helping me. I will give you the same info I gave them:

I am currently running two different ads to go directly to my YouTube channel. Unfortunately the FB tracking pixel doesn't work on YT, or if it does, I haven't figured out how to implement it.

My goal for both ads is to convert people to subscribers.

The first ad labeled "MIM Intro to get website clicks to YT channel" is a video and the second ad labeled "YT website clicks" is just a picture ad.

HERE is screen shot of the two ads analytics and HERE are the analytics for YT and getting subscribers.

The HUGE spike on the 14th was from a Reddit post that did well and linked to my channel. So just ignore that.

Coincidentally, the 14th is when I started both ads. As you can see, the amount of subscribers did go up after the 14th.

My question is, how do I find out how much I am paying for each new subscriber.

Oh, one other thing, as far as I know, YouTube wont tell you where each subscriber came from. So I don't know which subscribers came from my FB ads and which ones came from other sources.

Please let me know what other information you need and I will post it asap. Thank you so much for your help!

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