When you hear the word 'Calculator' you expect to enter numbers here and there, then result showed up according to formula. but I don't know where to input things in your toolbox and it's a view-only document. 'not user-friendly' isn't the word, it's more like 'not intuitive' because I'm not a user yet and still figuring out anything. being the only helpful math guy in the community sure is tough, you have to deal with people like me who won't go deeper into rabbit hole in those math. If only you could CSS the heck out of those formula it would be perfect.

I'll try pouring some ideas on the layouts,

For the gacha calculator, it would be something like: "Enter the amount of jewel/Nutaku gold/$", "select the rate-up type", "amount of SSR(KH,kamiless wep,eido) you have", "amount of SR you have", "amount of R KH you have",etc

Then the result cell would be: "Chances of getting SSR(KH,Kamiless wep,eido)", "chances of getting SSR dupes", "chances of getting new SSR","chances of getting featured SSR",etc.

For the damage calculator, it would be something like: "Enter the KH atk", "select debuff", "select enemy buff", "select negative status effect on KH", "select enemy status Stun/Normal/Raging", "select enemy element", "select KH element", "select active eidolon", "select friend eidolon", etc

Then the result cell would be: "Damage dealt in normal/raging/stun state", "Burst damage dealt in normal/raging/stun state", "chances to miss", "chances of double attack", "chances of triple attack", etc.

My advice is, make it so even an idiot could understand or not disheartened by a wall of numbers (I'm like that). And lastly, thank you for being "that math guy" everybody can rely on.