What a Compost Bin Does and Why You Need One

A Compost Bin in ARK: Survival Evolved converts organic materials—spoiled meat, spoiled fish, hide, straw, seeds, and other plant matter—into Fertilizer and Oil. You place raw materials inside, wait for the conversion timer to finish, and collect the output. This is the main way to produce Fertilizer without taming a Dung Beetle, and it's essential for crop farming and large-scale gardening.

The Compost Bin is a stationary structure you craft and place on your base. Unlike a Dung Beetle (which produces Fertilizer passively while alive), the Compost Bin requires you to manually load it and wait for each batch to finish. The trade-off is that you control exactly what goes in and when, and you don't need to feed or care for an animal.

Key Takeaways

  • Craft a Compost Bin at a Smithy using 50 Wood, 20 Thatch, 15 Stone, 5 Metal Ingot, and 10 Cementing Paste.
  • Place it on a flat surface in your base and load it with spoiled meat, spoiled fish, hide, straw, seeds, or other organic materials.
  • Each batch takes 30 minutes to convert and produces Fertilizer and Oil based on what you put in.
  • Spoiled meat and spoiled fish are the fastest materials to farm and produce the most Fertilizer per batch.
  • You can queue multiple batches by loading the bin again before the first one finishes, but only one batch processes at a time.

Crafting and Placing Your Compost Bin

To craft a Compost Bin, open your inventory and go to the Smithy tab (or use a Smithy structure). You need 50 Wood, 20 Thatch, 15 Stone, 5 Metal Ingot, and 10 Cementing Paste. On most servers, this takes about 5 seconds to craft. Once you have it, place it in your inventory and equip it like a structure.

Find a flat, open spot in your base where you have room to work. Aim at the ground and place the Compost Bin. It occupies a 1x1 foundation footprint, so it doesn't take up much space. Make sure the ground is level—if it's uneven, the bin may not place or may clip into the terrain. Once placed, the bin is ready to use when ready.

Loading Materials and Starting a Batch

Walk up to the Compost Bin and press the use key (E on PC, Y on Xbox, Triangle on PlayStation) to open its inventory. You'll see an empty list with a weight limit. Now load in your organic materials. The bin accepts spoiled meat, spoiled fish, hide, straw, seeds, vegetables, berries, and other plant-based items.

The most efficient materials are spoiled meat and spoiled fish because they're straightforward to farm and produce the most Fertilizer. You can get spoiled meat by leaving raw meat in a storage box for about 8 minutes, or by hunting carnivores and letting the meat spoil naturally. Spoiled fish comes from fishing or from dead fish corpses. Once you've loaded materials, close the inventory. The conversion timer starts when ready—you'll see a progress bar on the bin.

Understanding Conversion Times and Output

Each batch takes exactly 30 minutes to complete. During this time, the bin is locked and you cannot remove or add items. When the timer finishes, the bin produces Fertilizer and Oil. The exact amount depends on what you loaded in. Spoiled meat and spoiled fish produce the most Fertilizer (roughly 50 Fertilizer per 10 spoiled meat), while hide and straw produce less.

Once the batch is done, the bin unlocks and you can collect the output. Open the bin's inventory and take out the Fertilizer and Oil. If you don't collect it right away, it stays in the bin until you do. You can then load a new batch when ready.

Queueing Multiple Batches

You can load the Compost Bin again before the first batch finishes. When you do, the new materials sit in the bin's inventory queue and automatically start processing once the current batch completes. This lets you set up a production line without standing around waiting. However, only one batch processes at a time—the bin cannot run two conversions in parallel.

To queue batches efficiently, load the bin, wait a few minutes, then load it again with the same materials. Repeat this process to build up a queue. When you come back later, you'll have multiple batches of Fertilizer ready to collect. This is much faster than loading one batch, waiting 30 minutes, collecting, and then loading again.

Common Mistakes and Troubleshooting

The most common mistake is loading the bin with materials that don't convert well. Straw and seeds produce very little Fertilizer compared to spoiled meat and spoiled fish. If you're trying to farm Fertilizer quickly, focus on spoiled meat and spoiled fish instead. Another mistake is forgetting to collect the output—if the bin is full of Fertilizer, you can't load new materials until you empty it.

If the bin stops working or the timer disappears, check that you have enough weight capacity in the bin itself. Each material has a weight, and if the total exceeds the bin's limit, the conversion may stall. Also make sure the bin is not clipping into terrain or structures—if it's placed incorrectly, it may not function. If the bin is damaged, repair it with a Repair Hammer and Wood or Metal Ingot depending on the bin's material.

Using Fertilizer from Your Compost Bin

Once you collect Fertilizer from the Compost Bin, you can use it to speed up crop growth in Crop Plots. Place Fertilizer directly into a Crop Plot's inventory, and it will accelerate the growth stage of whatever plant is growing there. A single Fertilizer speeds up growth by one stage, and most crops have 4 to 5 growth stages. This is how you farm vegetables, berries, and seeds at scale.

Oil from the Compost Bin is used in crafting recipes and as fuel for certain structures. Keep both outputs in a storage box near your farm so you can grab them when you need them. If you're running a large farm, you'll want multiple Compost Bins running in parallel to keep up with demand.

Frequently Asked Questions

Can I use a Compost Bin on a server with taming disabled?

Yes. The Compost Bin is a structure, not a tamed creature, so it works on any server regardless of taming rules. It's the only way to produce Fertilizer if Dung Beetles are not available or if you prefer not to tame one.

What's the difference between a Compost Bin and a Dung Beetle?

A Compost Bin is a structure you craft and place; it requires manual loading and produces output on a 30-minute timer. A Dung Beetle is a tamed creature that produces Fertilizer passively over time without you loading anything. Dung Beetles are faster overall, but Compost Bins are easier to set up and don't require taming or feeding.

Can I move a Compost Bin after I place it?

Yes. Use a Repair Hammer to dismantle it, and it will drop as an item you can pick up and place elsewhere. If the bin has materials or output inside, collect those first before dismantling.

How much Fertilizer does one batch produce?

Output varies by material. Spoiled meat and spoiled fish produce the most—roughly 50 Fertilizer per 10 spoiled meat. Hide and straw produce much less. The exact numbers depend on your server settings, so test a batch to see what you get.

Do I need to feed or maintain a Compost Bin?

No. Once placed, the Compost Bin requires no upkeep, no food, and no taming. It only needs materials loaded into it to start a batch. This makes it a low-maintenance way to produce Fertilizer compared to keeping a Dung Beetle alive.