Rust Decay Calculator
Analyze your Tool Cupboard resources and optimize your base maintenance time.
Your base will start decaying when the first material runs out.
0h
0h
0h
0h
Resource Duration Distribution
Visual representation of how long each material tier will last (hours).
| Material | Amount Stored | Hourly Cost | Time Until Depletion | Total Decay Time (After Empty) |
|---|
Note: Total Decay Time is the duration it takes for a structure to disappear completely after its resource runs out.
What is a Rust Decay Calculator?
A Rust Decay Calculator is an essential tool for players of the survival game Rust. It allows players to input their current resource stockpiles and hourly upkeep costs to determine exactly how long their base will remain standing. In the harsh world of Rust, “decay” is the mechanic that prevents the map from becoming cluttered with abandoned structures. If a player fails to keep the correct materials in their Tool Cupboard (TC), the base begins to lose health until it eventually collapses.
This Rust Decay Calculator is specifically designed for homeowners and clan leaders who need to manage their resources efficiently. Whether you are logged off for a night or planning a weekend away, knowing your base maintenance timeline ensures you won’t return to find your hard-earned loot exposed to the elements or scavengers.
Rust Decay Calculator Formula and Mathematical Explanation
The math behind base maintenance is relatively straightforward, but it scales based on the size of your base, often referred to as “Building Tax.” The Rust Decay Calculator uses the following core logic:
Duration (Hours) = Total Resources in TC / Upkeep Cost Per Hour
To calculate the specific decay of a building block after resources run out, the game uses fixed decay timers:
- Wood: 2 hours until total collapse.
- Stone: 4 hours until total collapse.
- Sheet Metal: 8 hours until total collapse.
- Armored (HQM): 12 hours until total collapse.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Stored Amount | Total material count in the Tool Cupboard | Units | 1 – 50,000 |
| Hourly Cost | The amount consumed by the TC every 60 mins | Units/Hr | 5 – 2,500 |
| Building Tax | Percentage increase based on base size | % | 10% – 33% |
| Decay Tier | The health drain speed once material is empty | Hours | 2h – 12h |
Practical Examples (Real-World Use Cases)
Example 1: The Solo Starter Base
A player has a simple 2×2 Stone base with a few metal doors. The TC shows an upkeep of 200 Stone per hour and 10 Metal Fragments per hour. The player puts in 4,000 Stone and 500 Metal Fragments. Using the Rust Decay Calculator:
- Stone Lifetime: 4,000 / 200 = 20 Hours
- Metal Lifetime: 500 / 10 = 50 Hours
- Result: The base starts decaying in 20 hours because the Stone runs out first.
Example 2: The Clan Fortress
A massive clan base requires 2,500 Stone, 1,200 Metal, and 45 HQM per hour. The clan fills the TC to the brim with 25,000 Stone, 20,000 Metal, and 1,000 HQM. Using our tool:
- Stone Lifetime: 10 Hours
- Metal Lifetime: 16.6 Hours
- HQM Lifetime: 22.2 Hours
- Result: This base requires a refill in just 10 hours, highlighting the importance of resource management for large groups.
How to Use This Rust Decay Calculator
Using our tool is simple and provides instant results for your base design planning:
- Locate your Tool Cupboard: Open the TC interface in-game to see your current “Upkeep” numbers per material type.
- Input Stored Quantities: Enter the current amount of Wood, Stone, Metal, and HQM you have inside the TC slots.
- Input Hourly Upkeep: Enter the “per hour” cost shown in the bottom right of the TC menu.
- Analyze Results: The calculator will highlight the “Primary Maintenance Time,” which is the shortest time before any part of your base starts to rot.
- Review Chart: Use the dynamic bar chart to see which resource is your “bottleneck” (the one that runs out fastest).
Key Factors That Affect Rust Decay Calculator Results
- Building Tax: As your base grows (number of blocks), the percentage of the total cost required for upkeep increases. Small bases pay 10%, while massive ones can pay up to 33.3%.
- Material Tier: Mixing tiers (e.g., Stone walls with Metal doors) means different parts of the base will decay at different times if resources run out.
- Tool Cupboard Capacity: Since a TC has limited slots (24), high-upkeep bases are physically limited by how many materials they can hold simultaneously.
- External TCs: Large bases use multi-TC designs to split the building tax and extend the decay timer.
- Server Modifiers: Some modded servers reduce decay rates or remove them entirely. This Rust Decay Calculator is based on Vanilla (1x) settings.
- Raid Damage: If a raider destroys your TC, decay starts immediately unless they replace the TC and add resources.
Frequently Asked Questions (FAQ)
Does decay happen while I am online?
Yes, decay is a constant process in Rust. As long as the base exists, it consumes resources from the Tool Cupboard every minute.
What happens if I have no Wood but my base is all Stone?
If your base has no Wood components (like wooden window bars or doors), the lack of Wood in the TC will not cause any decay.
How can I increase my base’s lifetime?
The best way is to use higher-density resources (HQM and Metal) or to use optimized blueprints that use fewer blocks for the same protection.
Does the TC itself decay?
The TC does not decay, but if the floor underneath it decays and breaks, the TC will be destroyed, and the rest of the base will decay rapidly.
Can I stop decay without a Tool Cupboard?
No. In vanilla Rust, a Tool Cupboard is mandatory to prevent decay for any player-built structure.
How long does a metal door last once it starts decaying?
Sheet metal components have an 8-hour decay window from full health to zero health.
Does the number of doors affect upkeep?
Yes, every building block (foundations, walls, ceilings, doors, stairs) contributes to the total upkeep cost.
What is the “Building Tax” brackets?
0-15 blocks: 10%, 16-50 blocks: 15%, 51-125 blocks: 20%, 126+ blocks: 33.3%.
Related Tools and Internal Resources
- Rust Resource Calculator: Estimate how many materials you need to farm for a full base build.
- Rust Raid Cost Calculator: Calculate how much sulfur you need to break into a base.
- Rust Electricity Calculator: Plan your circuit boards and power consumption.
- Comprehensive Upkeep Guide: Tips and tricks for lowering your daily maintenance costs.