![Valley Prison [V3] Calculator](/media/optimized/5ed5f9751846a54380b9e3c8-960.webp)
This calculator is arithmetic on a table, not a live mixer. Enter quantities from your own Valley Prison [V3] session. It will not click the shop.
Drop probability
Employee Keycard search chance
Estimate how many trash cans you may need to search before an Employee Keycard shows up, using the documented 10 percent figure or your own percent.
Chance of at least one success = 1 − (1 − chance per attempt) raised to the number of attempts.
Guides document about a 10 percent chance to pull an Employee Keycard from a facility trash can. That figure is a published estimate, not an official drop table. Change the percent if your server feels different. The result is the chance of at least one success across independent searches.
Material planner
Rope shirts needed
Count the shirts still needed to craft ropes. One documented rope uses 2 shirts and 3 pants.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
One rope is documented as 2 shirts and 3 pants from the laundry racks. This form counts shirts only. Use the pants calculator for the other half of the recipe.
Material planner
Rope pants needed
Count the pants still needed to craft ropes. Laundry shelves can be empty; wait for the clothing piles to respawn rather than assuming a second rack is stocked.
Required total = materials per upgrade × number of upgrades. Missing = max(required total − materials already owned, 0).
One rope is documented as 2 shirts and 3 pants. This form counts pants only.