See when you can afford an upgrade based on current resources and production.
Enter resources and target cost.
The Resource Planner answers the only inventory question that matters: when can I afford it? For each of the five resources — food, wood, stone, iron, gold — you enter current stock, hourly production, and the target cost. The tool computes each deficit and divides by your production rate, then reports the binding constraint: the single resource whose wait time gates the whole purchase. Everything runs on your own numbers, so it is immune to game-balance changes.