Will's d100 Commonality Calculator
This is a tool that will help you assign a number of items to a d100 based on their rarity!
I had need for this when a player of mine wanted to use Flutes Loot "Artificer's Field Guide"
The "Artificer's Field Guide" is an awesome way to add depth to the herbalism and alchemy of your campaign I highly recommend checking it out!
At the bottom of the page you can find the tables I created to use with The "Artificer's Field Guide" which is a great example of what this tool can do
Put the number of each rarity in the boxes below and press the button!