Something I made during my spare time. Originally made this for myself so I can estimate my pulls-to-pity cost and Primogem income over time. Now I'm confident enough to share this to the community! 
Disclaimers:
✧This does NOT calculate your pull chances or "soft pity".
✧This only counts Primogems not including the Fates you may acquire.
✧I only update this during my spare time and might become outdated when new sources of Primogems pop up.
✧This app does not collect sensitive in-game/player info, it's merely a calculator.
https://chorvaworld.com/primocalc/
How to use (Basic ver.):
Pretty straightforward. I hope. 
Advanced mode:
1.) Advanced mode toggle:
Turn this on to begin calculating your Primogem income estimates.
2a.) Blessing of the Welkin Moon?
Enable this if you plan to purchase Blessing of the Welkin Moon. Remember you can only stack up to 180 days at a time.
Note: This does not count the 300 Genesis Crystals you gain per Welkin, you write that in the Genesis Crystals field below.
2b.) Welkin Days left?
To find out how many days you have left. Open the Shop Menu and you should see this.
Example:
3.) Abyssal Moon Spire Clears:
This is referring to floors 9-12 of the Spiral Abyss that reset every 1st & 16th of the month. Writing 2 means you've cleared 2 waves for the month. You can further increase the number if you see yourself doing more clears in the future.
1 clear = 600 Primogems.
4.) Commission days:
Doing all 4 commissions per day currently will net you 60 Primogems. Useful if you wanna know how much you can potentially earn for [x] amount of days. (Example, tracking your Primogem income from doing commissions until a certain banner ends)
5a.) Genesis Crystals
This is where unspent Genesis Crystals go.
5b.) Use Crystals?
Tick this to convert your Genesis Crystals in 5a to Primogems.
6.) Others?
Incoming Apologems, upcoming event/code rewards, or just any Primogems you're expecting go here.
7a.) Gnostic Hymm?
Tick this to enable Gnostic Hymm (Paid Battlepass).
Note: Ticking this assumes you complete Level 50. Does not include the Fates you get.
7b.) BP Counts?
Think of how many times are you willing to purchase AND complete the Gnostic Hymm battle pass.
Remember each Battle Pass season lasts for roughly 40 days.
8.) Total Primogems.
Estimated total Primogems after adding other possible sources on top of your current Primogems.
9.) Estimated pulls:
Estimated amount of pulls you can afford with your potential Primogems.
Corrections and bug reports are highly appreciated. If you found this tool helpful, please hit like and fave for others to see!
