This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own 100 Days on Chunk session. It will not click the shop.
Material planner
Gems still needed for a class
Subtract the Gems you already have from a class price you type in. The default is the 150 Gem price published for Ninja and Lumberjack. Change the price before you use it for Chef, Medic, or Vampire, and do not use it for Engineer.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
Use the Gem number shown in the lobby Class Shop. Chef and Medic are 75, Lumberjack and Ninja are 150, and Vampire is 300 in the late September and October 1, 2026 writeups. Engineer is bought with Robux, so this form cannot price it. The result is Gems still needed, not a promise the shop price is unchanged.
Material planner
Wood for the first chunk
Count how much wood you still need for the opening chunk. The live craft menu is the check. Leaves are a separate cost of 2 on that same prompt.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
Gameplay shows the opening chunk prompt as 8 wood and 2 leaves. This form counts wood only. It does not price later biome chunks, boss chunks, or the leaves. A later craft in the same public runs also spent wood and leaves and showed a percentage, so do not treat 8 wood as every chunk in the menu.