Rust Decay Calculator: when your wall or door falls

Every grade, from full HP

Time for a full piece to fall once nothing pays its upkeep. Under a roof it lasts 10 times as long. Walls, floors, foundations, roofs and stairs of one grade share their HP and their decay, and every one of them adds to the cupboard's upkeep, both spiral stairs included.

Grade	Full HP	Outside	Under a roof
Twig	10	1 h	10 h
Wood	250	3 h	30 h
Stone	500	5 h	50 h
Sheet Metal	1,000	8 h	3 days 8 h
Armored	2,000	12 h	5 days

Doors, hatches and high walls

Doors, hatches and high walls pay upkeep from the tool cupboard like a wall, and start decaying the moment it cannot pay for them. Times from full HP.

Piece	Full HP	Decays like	Outside	Under a roof
Lunar Wall Frame Inlay	100	Wood	3 h	30 h
Shop Front	500	Wood	3 h	30 h
Wood Double Door	200	Wood	3 h	30 h
Wood Shutters	200	Wood	3 h	30 h
Wooden Door	200	Wood	3 h	30 h
Wooden Frontier Bar Doors	200	Wood	3 h	30 h
Wooden Window Bars	250	Wood	3 h	30 h
Chainlink Fence	100	Sheet Metal	8 h	3 days 8 h
Chainlink Fence Gate	75	Sheet Metal	8 h	3 days 8 h
Elevator	600	Sheet Metal	8 h	3 days 8 h
Floor grill	250	Sheet Metal	8 h	3 days 8 h
Floor triangle grill	250	Sheet Metal	8 h	3 days 8 h
Garage Door	600	Sheet Metal	8 h	3 days 8 h
High External Stone Gate	500	its own clock	8 h	3 days 8 h
High External Stone Wall	500	its own clock	8 h	3 days 8 h
High External Wooden Gate	500	its own clock	8 h	3 days 8 h
High External Wooden Wall	500	its own clock	8 h	3 days 8 h
High Ice Wall	500	its own clock	8 h	3 days 8 h
Ladder Hatch	250	Sheet Metal	8 h	3 days 8 h
Metal horizontal embrasure	500	Sheet Metal	8 h	3 days 8 h
Metal Shop Front	750	Sheet Metal	8 h	3 days 8 h
Metal Vertical embrasure	500	Sheet Metal	8 h	3 days 8 h
Metal Window Bars	500	Sheet Metal	8 h	3 days 8 h
Prison Cell Gate	300	Sheet Metal	8 h	3 days 8 h
Prison Cell Wall	300	Sheet Metal	8 h	3 days 8 h
Sheet Metal Door	250	Sheet Metal	8 h	3 days 8 h
Sheet Metal Double Door	250	Sheet Metal	8 h	3 days 8 h
Triangle Ladder Hatch	250	Sheet Metal	8 h	3 days 8 h
Armored Door	1,000	Armored	12 h	5 days
Armored Double Door	1,000	Armored	12 h	5 days
Armored Ladder Hatch	1,000	Armored	12 h	5 days
Armored Triangle Ladder Hatch	1,000	Armored	12 h	5 days
Reinforced Glass Window	500	Armored	12 h	5 days
Strengthened Glass Window	350	Armored	12 h	5 days

Siege weapons, after their last use

A built siege weapon ignores the tool cupboard: it starts wearing 5 minutes after it was last used, then falls over the times below. A frame still waiting for its last hit is a deployable that costs no upkeep, timed here out of a cupboard's reach.

Siege weapon	Full HP	Outside	Under a roof	Frame, out of reach
Mounted Ballista	300	10 h	4 days 4 h	4 h
Battering Ram	1,000	10 h	4 days 4 h	4 h
Catapult	500	10 h	4 days 4 h	4 h
Siege Tower	1,000	10 h	4 days 4 h	4 h

On a server without upkeep

With upkeep turned off, only foundations and twig pieces decay, on hours of their own, and a roof does not slow them. Each side joined to another foundation takes 25% off, and all 4 stop it. Doors and most deployables only decay outside there.

Grade	Waits	Foundation alone	3 sides joined
Twig	1 h	2 h	5 h
Wood	18 h	42 h	4 days 18 h
Stone	18 h	66 h	8 days 18 h
Sheet Metal	18 h	3 days 18 h	12 days 18 h
Armored	24 h	6 days	21 days

Deployables out of a cupboard’s reach

124 deployables that cost no upkeep. Inside the reach of a tool cupboard, empty or not, they do not decay. Out of it, each waits its own time, then falls over its own time. Chairs, sofas, fireworks, instruments and a few others are not listed: the game never runs this clock on them.

All 124, A to Z

Piece	Full HP	Waits	Outside	Under a roof
Anchor	300	5 h	13 h	3 days 13 h
Animal Fence	100	5 h	13 h	3 days 13 h
Animal Fence Gate	100	5 h	13 h	3 days 13 h
Audio Alarm	100	48 h	6 days	42 days
Barbed Wooden Barricade	400	5 h	13 h	3 days 13 h
Barbeque	200	48 h	4 days	22 days
Bath Tub Planter	100	48 h	4 days	22 days
Beach Parasol	100	4 h	8 h	44 h
Beach Table	200	8 h	16 h	3 days 16 h
Beach Towel	200	24 h	36 h	6 days
Beehive	300	5 h	13 h	3 days 13 h
Biofuel Generator	500	48 h	6 days	42 days
Boat Building Station	500	48 h	6 days	42 days
Boom Box	100	48 h	6 days	42 days
Camp Fire	50	48 h	4 days	22 days
CCTV Camera	150	48 h	4 days	22 days
Chicken Coop	250	5 h	13 h	3 days 13 h
Chinese Lantern	50	48 h	4 days	22 days
Chinese Lantern White	50	48 h	4 days	22 days
Christmas Tree	1,000	48 h	6 days	42 days
Clothing Mannequin	30	48 h	6 days	42 days
Coffin	300	5 h	13 h	3 days 13 h
Composter	500	48 h	6 days	42 days
Concrete Barricade	500	none	15 min	2 h 30 min
Confetti Cannon	100	48 h	4 days	22 days
Connected Speaker	50	48 h	6 days	42 days
Cooking Workbench	500	48 h	6 days	42 days
Counter	100	48 h	6 days	42 days
Cursed Cauldron	50	48 h	4 days	22 days
Digital Clock	100	8 h	16 h	3 days 16 h
Disco Floor	50	8 h	16 h	3 days 16 h
Electric Furnace	500	48 h	6 days	42 days
Engineering Workbench	500	48 h	6 days	42 days
Fish Trophy	75	48 h	4 days	22 days
Fogger-3000	100	48 h	6 days	42 days
Frankenstein Table	500	48 h	6 days	42 days
Fridge	200	48 h	6 days	42 days
Furnace	500	48 h	6 days	42 days
Giant Candy Decor	250	48 h	6 days	42 days
Giant Lollipop Decor	150	48 h	6 days	42 days
Graveyard Fence	100	5 h	13 h	3 days 13 h
Hitch & Trough	250	5 h	13 h	3 days 13 h
Hobo Barrel	50	48 h	4 days	22 days
Homemade Landmine	100	48 h	4 days	22 days
Igniter	250	5 h	13 h	3 days 13 h
Jack O Lantern Angry	50	48 h	4 days	22 days
Jack O Lantern Happy	50	24 h	48 h	11 days
Jukebox	100	48 h	6 days	42 days
Lantern	50	48 h	4 days	22 days
Large Banner on pole	300	8 h	16 h	3 days 16 h
Large Furnace	1,500	8 h	16 h	3 days 16 h
Large Hunting Trophy	100	48 h	4 days	22 days
Large Planter Box	250	48 h	4 days	22 days
Large Solar Panel	100	8 h	16 h	3 days 16 h
Large Water Catcher	300	5 h	13 h	3 days 13 h
Large Wood Box	300	5 h	13 h	3 days 13 h
Laser Light	50	48 h	6 days	42 days
Legacy Wood Shelter	500	18 h after its door	24 h	3 days 6 h
Locker	500	48 h	6 days	42 days
Mail Box	300	5 h	13 h	3 days 13 h
Medieval Barricade	400	5 h	13 h	3 days 13 h
Metal Barricade	600	5 h	13 h	3 days 13 h
Minecart Planter	100	48 h	4 days	22 days
Mini Fridge	100	24 h	3 days	21 days
Mixing Table	500	48 h	6 days	42 days
Modular Car Lift	250	12 h	28 h	7 days 4 h
Netting	100	none	3 h	30 h
Plank	300	5 h	13 h	3 days 13 h
PTZ CCTV Camera	150	48 h	4 days	22 days
Reactive Target	250	48 h	4 days	22 days
Repair Bench	200	5 h	13 h	3 days 13 h
Research Table	200	5 h	13 h	3 days 13 h
RF Broadcaster	50	48 h	4 days	22 days
RF Receiver	50	48 h	4 days	22 days
Sail	300	5 h	13 h	3 days 13 h
SAM Site	1,000	8 h	20 h	5 days 8 h
Sandbag Barricade	150	none	15 min	2 h 30 min
Scarecrow	250	48 h	6 days	42 days
Search Light	150	8 h	16 h	3 days 16 h
Seismic Sensor	200	8 h	16 h	3 days 16 h
Short Ice Wall	200	none	8 h	3 days 8 h
Single Plant Pot	250	48 h	4 days	22 days
Skull Fire Pit	50	48 h	4 days	22 days
Skull Trophy	150	5 h	13 h	3 days 13 h
Sky Lantern	100	48 h	4 days	22 days
Sleeping Bag	200	24 h	36 h	6 days
Small Boat Engine	300	5 h	13 h	3 days 13 h
Small Hunting Trophy	75	48 h	4 days	22 days
Small Oil Refinery	1,500	5 h	13 h	3 days 13 h
Small Planter Box	100	48 h	4 days	22 days
Small Ramp	300	5 h	13 h	3 days 13 h
Small Spike Trap	30	1 h	3 h	21 h
Small Water Catcher	200	5 h	13 h	3 days 13 h
Smart Alarm	50	48 h	4 days	22 days
Snap Trap	200	48 h	4 days	22 days
Snowman	250	48 h	6 days	42 days
Sound Light	50	48 h	6 days	42 days
Spooky Speaker	100	48 h	6 days	42 days
Sprinkler	200	8 h	16 h	3 days 16 h
Stone Barricade	100	none	15 min	2 h 30 min
Stone Fireplace	500	48 h	4 days	22 days
Strobe Light	100	48 h	6 days	42 days
Survival Fish Trap	100	48 h	4 days	22 days
Telephone	150	8 h	16 h	3 days 16 h
Tesla Coil	250	5 h	13 h	3 days 13 h
Tin Can Alarm	50	30 min	2 h 30 min	20 h 30 min
Torch Holder	50	48 h	4 days	22 days
Triangle Planter Box	100	48 h	4 days	22 days
Tuna Can Lamp	50	48 h	4 days	22 days
Twitch Rivals Neon Sign	100	48 h	4 days	22 days
Wall Cabinet	300	5 h	13 h	3 days 13 h
Wanted Poster	100	48 h	4 days	22 days
Watch Tower	200	2 h	4 h	22 h
Water Barrel	250	8 h	16 h	3 days 16 h
Water Pump	300	8 h	16 h	3 days 16 h
Water Wheel	400	8 h	16 h	3 days 16 h
Wind Turbine	250	8 h	16 h	3 days 16 h
Wood Storage Box	150	48 h	6 days	42 days
Wooden Barricade	250	5 h	13 h	3 days 13 h
Wooden Barricade Cover	80	none	15 min	2 h 30 min
Wooden Floor Spikes	100	24 h	48 h	11 days
Workbench Level 1	500	48 h	6 days	42 days
Workbench Level 2	500	48 h	6 days	42 days
Workbench Level 3	750	48 h	6 days	42 days

A Rust building piece starts losing health as soon as the tool cupboard stops paying its upkeep, and falls after the decay time of its grade: a full Stone Wall of 500 HP lasts 5 hours outside and 10 times as long under a roof. A damaged piece falls sooner, in proportion to the HP it has left.

How the Rust decay calculator works

The RustPotato Decay Calculator, a decay timer for Rust bases, works out when a building piece, door, deployable or siege weapon falls from the HP it has left, outside or under a roof, with a soonest and a latest time. RustPotato reads every decay time, delay and HP from the game files for default servers and servers without upkeep; a server that changes decay.scale or the decay durations runs on its own clock.

What starts the decay clock in Rust

Rust decay starts the moment the tool cupboard (TC) cannot pay a piece's share of upkeep. It goes block by block and resource by resource: a cupboard out of stone stops paying for your stone walls and keeps paying for the wooden ones. The server then takes HP off each piece about every 10 minutes, in proportion to the time that passed, and the piece falls on the pass that takes its last point.

Cupboard empty: every piece it covers starts losing HP at the next server pass
Cupboard out of one resource, say Stone: only the pieces paid in Stone decay
No cupboard in reach: deployables wait their own delay, then fall over their own time

Why Rust pieces under a roof last longer

Decay inside a Rust base runs 10 times slower than outside. A building piece counts as inside when other pieces cover it from above, straight up and at 45 degrees toward each of its four sides, which is why an outer wall goes first and the core of a honeycomb base lasts the longest.

How decay follows upkeep in Rust

Rust upkeep is what the tool cupboard pays to keep a base standing, and decay is what happens once that stock runs out. The Upkeep Calculator works out how many hours your cupboard can still pay; enter them under Protected for in this calculator to see when each piece falls.

How long a whole Rust base takes to decay, and how to stop it

A whole Rust base does not decay at one speed: each piece runs its own clock from the HP it has left. Once the cupboard stops paying, outer stone walls fall in 5 hours and Sheet Metal walls or doors in 8, while roofed stone holds for 50 hours and roofed Armored for 5 days. Twig and wood building grades go first, in 1 and 3 hours outside. Refilling the cupboard with every required resource stops decay at once.

Questions about decay in Rust

How long does a stone wall take to decay in Rust?

A full Stone Wall in Rust takes 5 hours to fall outside once the tool cupboard stops paying, and 50 hours under a roof. A wall already down to 250 of its 500 HP falls in half that time: 2 hours 30 minutes outside, 25 hours under a roof. Type the HP left in the Decay Calculator for any other wall.

Does a wall with no roof count as inside in Rust?

A Rust wall with no roof above it does not count as inside: four walls with nothing on top still decay at the full rate, 10 times faster than under a roof. Roof the room and the pieces inside get the slow rate, while an outer wall, open on one side, keeps the full rate. Pick Outside or Under a roof under Where in the Decay Calculator.

Do boxes and furnaces decay inside a base?

In Rust, boxes, furnaces and the other deployables that cost no upkeep do not decay while any tool cupboard covers them, even an empty one. Pick None in reach in the calculator to time them outside a base: a Large Wood Box waits 5 hours and falls over 8 hours, and a Furnace waits 48 hours and falls over 4 days.

Do doors decay in Rust?

Doors in Rust decay like the grade they are made of, and the tool cupboard pays upkeep for them like a wall. Pick your door in the calculator above to time its remaining HP: from full health, a Wooden Door falls 3 hours after the cupboard stops paying, a Sheet Metal Door or Garage Door after 8 hours, and an Armored Door after 12 hours outside.

What happens when the tool cupboard is destroyed?

A destroyed tool cupboard (TC) pays for up to 24 hours of protection for every piece of its base on the way out, from whatever it still holds, piece by piece until the stock runs out. Pieces it could not pay for start decaying at once, and the Decay Calculator times them from there.

Why did my wall fall later than the calculator said?

Each Rust piece rolls its own decay speed when it is placed, between the full rate and 5% slower, so it can stand about 5.3% longer than the soonest time: 16 minutes more for a full Stone Wall outside. The server also removes HP in passes about every 10 minutes.

Does a foundation surrounded by other foundations decay slower in Rust?

Not on a normal Rust server: with upkeep on, a roof is the only thing that slows decay. The neighbour rule only runs on a server that turns upkeep off, where each side joined to another foundation takes 25% off its decay and a foundation joined on all 4 sides does not decay at all, so the Decay Calculator only asks whether the piece is under a roof.

How long does a catapult take to decay in Rust?

In Rust, a built Catapult of 500 HP wears out over 10 hours in the open and 4 days 4 hours under a roof, whatever the tool cupboard holds. The wear starts 5 minutes after its last shot or reload, and you can time its remaining HP under Siege weapon in the calculator. A Catapult frame still waiting for its last hit is a deployable: out of a cupboard's reach it waits 2 hours and then falls over 2 hours.

When does a Legacy Wood Shelter decay?

In Rust, a Legacy Wood Shelter does not decay while a tool cupboard covers it, or while its door has been opened in the last 18 hours. Pick it in the calculator to time its door clock: out of a cupboard's reach and 18 hours after its door was last opened, it falls over 6 hours from full HP. A player keeps one shelter at a time: placing another removes the oldest.

Does a piece heal when I refill the tool cupboard?

Yes, a Rust piece heals once the tool cupboard can pay again and nothing has hit it for 10 minutes, at its outside decay rate: 100 HP an hour for Stone, so a wall at 250 HP is full in 2 hours 30 minutes. The Igniter and the Tesla Coil heal 1.5 times as fast.

Why is RustPotato's Decay Calculator the best decay calculator for Rust?

RustPotato's Decay Calculator is the best decay calculator for Rust because it reads every decay time, delay and HP from the game files and times any building piece, door, deployable or siege weapon from the HP left, outside or under a roof. It gives soonest and latest times for the 5% roll, covers servers without upkeep, and keeps browser timers.