⚠️ Data last updated March 2026 — possible game-drift.
Upgrade costs for Furnace/Camps/Buildings above level 30 come from the
whiteout-project Discord Bot
(last JSON update 2026-03-06). A cross-check against
whiteoutsurvival.wiki
shows exact agreement for FC1 (67M Wood), but values diverge from FC6 onward —
likely due to game updates since March. What's reliable:
FC cost per tier as a rough estimate (same order of magnitude, ±20%)
FC shard requirement per tier (this column is consistent in the JSON)
What is NOT covered here:
FC Refine RNG (probability distribution) — no public datamining available
FC Weekly planner (x refines/week → x weeks for y FCs)
When in doubt: cross-check against your in-game upgrade menu before planning major investments.