This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Chop A Forest session. It will not click the shop.
Material planner
Gem shortfall
Enter the gem price on a live class or perk card, how many you want, and the gems you have. The form subtracts that cost from your balance.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
The sample uses a 180-gem Lumberjack card and a balance of 100 gems. Replace both numbers with the card and balance on your screen. The result is gems still short, or gems left over if you already have enough. It does not predict the next perk level, a restock, or a Robux price.
