Rust Decay Calculator: Time to Decay, HP Loss & TC Upkeep

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The material the building piece is made of. Higher tiers decay more slowly.
The current HP of the piece as a percentage of its maximum. Lower HP means the piece has less time remaining.
%
Sheltered structures decay more slowly. Wood under a roof lasts 6 h instead of 3 h, stone 8 h instead of 5 h, and so on.
Total number of building blocks in your base (walls, floors, foundations, doorframes, etc.) within the Tool Cupboard's 40 m radius. Used to estimate daily upkeep.
pieces
Time to Full DecayModerate decay window
5hours

Hours until the piece reaches 0 HP with no TC upkeep.

Decay Time in Minutes300min
HP Lost per Hour100HP/h
Daily TC Upkeep400
Upkeep ResourceStone
Base Decay at 100% HP5hours
5 h
Critical (< 1 h)<1Urgent (< 5 h)1-5Moderate (< 12 h)5-12Safe (12-16 h)12+

Your Stone piece will decay in 5 h 0 min.

  • At 100% HP, your Stone piece will reach zero in about 5 h 0 min without TC support.
  • It loses roughly 100.0 HP per hour (outdoor rate).
  • To keep this tier alive indefinitely, stock your TC with 400 Stone per day (at the 10% drain rate when TC is above half capacity).

Next stepKeep your TC at least half full to benefit from the lower 10% drain rate. Dropping below 50% switches to the 30% rate, tripling your daily costs.

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