What the dried kelp block is
The dried kelp block is a compact, opaque block crafted from nine dried kelp. It looks like a dark, mottled green cube with a rough, fibrous texture. In one slot of your inventory it stores the same amount of dried kelp that would otherwise take up nine slots, which makes it the most space-efficient way to keep large stockpiles. It also doubles as one of the strongest renewable fuel sources in the game.
Two things make this block useful: storage and fuel. If you already have a kelp farm, every dried kelp block you craft is both a stack of food crunched into a single slot and a furnace fuel that smelts 20 items per block.
How to make a dried kelp block
Making one dried kelp block takes three steps:
- Collect kelp from any ocean biome.
- Smelt the kelp in a furnace, smoker, or campfire to get dried kelp.
- Place 9 dried kelp in a crafting grid to produce 1 dried kelp block.
Finding kelp
Kelp grows naturally in most ocean biomes, including warm, lukewarm, cold, and frozen oceans. You will find patches almost anywhere there is water with a sand, dirt, or gravel floor. Break the kelp with any tool. Bare hands work. A sword is the fastest, since kelp counts as a plant.
Each block of kelp drops one kelp item when broken. The plant grows upward over time, so cutting the bottom block destroys the column above it. If you want a regrowing source, leave the bottom block and break above it.
A kelp plant can grow up to 26 blocks tall. Each individual plant has a randomly assigned maximum age between 1 and 25 stages, so some columns stop growing before reaching the surface even if there is room. Light level affects growth speed but not the final height. Bone meal applied to a kelp plant grows the column instantly by a random number of blocks, which is the fastest way to fill a vertical farm shaft.
Smelting kelp into dried kelp
Place raw kelp in the top slot of a furnace, smoker, or campfire. Any fuel works. Each piece of kelp takes 200 ticks (10 seconds) in a regular furnace and half that in a smoker. The output is dried kelp, an edible item you can also use for crafting.
Smoking is faster but uses fuel at the same rate, so the smoker is the better option if you have one. Campfires cook food without any fuel cost, but they only handle four items at once and take longer per item.
Crafting the block
Once you have nine dried kelp, open a crafting table and fill the 3×3 grid with all nine items. The output is one dried kelp block. The recipe uses all nine slots, so you cannot make a partial block from fewer dried kelp items.
To get the dried kelp back, place a dried kelp block alone in a crafting grid. It returns nine dried kelp items. The block is reversible, which is part of what makes it a clean storage option.
Using the dried kelp block as fuel
This is where the block shines. A single dried kelp block burns for 4000 ticks, or 200 seconds. That is enough to smelt 20 items in a regular furnace. For comparison:
| Fuel | Items smelted per unit | Renewable? |
|---|---|---|
| Dried kelp block | 20 | Yes |
| Coal or charcoal | 8 | Charcoal only |
| Block of coal | 80 | No (coal); yes (charcoal block) |
| Lava bucket | 100 | Indirectly |
| Stripped log | 1.5 | Yes |
Per inventory slot the dried kelp block beats coal by 2.5x. A stack of dried kelp blocks (64) smelts 1,280 items. A stack of coal smelts 512. The block of coal still wins on density, but you cannot grow coal, and a working kelp farm can produce hundreds of dried kelp blocks per hour with no manual input.
The block also works in blast furnaces and smokers at the same total burn time. In a smoker, smelting goes twice as fast, so one block runs through 20 food items in 100 seconds.
Storage benefits
One dried kelp block holds nine dried kelp in a single inventory slot. A full stack of 64 blocks holds 576 dried kelp. If you ever run a kelp farm at scale, this matters. Dried kelp blocks compress everything into a few chest slots, which keeps storage rooms tidy and frees space for other resources.
You can also eat the contents in a pinch by uncrafting a block back to dried kelp. Each piece of dried kelp restores 1 hunger (half a drumstick) and 0.6 saturation. It is not a great food, but for emergencies it does the job.
Building a renewable kelp fuel farm
A simple kelp farm uses observers and pistons to harvest a single column of kelp every time it grows. The setup looks like this:
- Place a water source over a sand or dirt block, two blocks deep.
- Plant kelp at the bottom.
- Put an observer facing the column at the height you want it cut.
- Attach a piston next to the kelp at the cut height.
- Wire the observer to the piston so the piston extends every time the observer detects growth.
- Collect the broken kelp in a hopper underneath.
Feed the harvested kelp into a smoker (or a row of smokers) using a hopper chain. The smoker output goes into a chest. Once you have a chest filling with dried kelp, a separate auto-crafter or manual session turns those into blocks.
One small kelp farm with eight columns and a single smoker can produce a steady supply of dried kelp blocks while you are off doing other things. Stack the farms for more throughput.
Tips and common mistakes
A few things that trip players up:
- Do not try to craft a block from raw kelp. You need dried kelp, which is the smelted form.
- The block is mineable with anything, but a hoe is the fastest tool in Java Edition 1.16.5 and later.
- Dried kelp blocks cannot be composted. The composter accepts dried kelp items but not blocks. If you have too many blocks and want to clear them, uncraft them first.
- Pistons can push and pull dried kelp blocks normally. They move as regular full blocks, not as sticky or slime-like blocks.
- Endermen cannot pick up dried kelp blocks, so they will not get rearranged at night.
If you are using the block as fuel and run out, remember that you only need nine dried kelp to make another block. A small handful of kelp columns, even basic ones, will keep your furnaces fed indefinitely.
Java vs Bedrock differences
There are no meaningful differences between editions for the dried kelp block itself. Recipes, fuel burn time, drop behavior, and texture are identical in Java and Bedrock. Where the editions differ is in how piston-based kelp farms behave, since piston timing and observer chains can act slightly differently across them. If you are following a farm tutorial, make sure it is built for your version.
One small Bedrock-specific note: kelp growth rates are slightly different in Bedrock than in Java, so farms can produce at a different real-world rate depending on the edition. The block itself behaves the same in both.
Frequently asked questions
How many items does a dried kelp block smelt?
Twenty items in a regular furnace, a blast furnace, or a smoker. The total burn time is 4000 ticks (200 seconds). Each item takes 200 ticks in a furnace and 100 ticks in a smoker or blast furnace.
Is the dried kelp block better than coal as fuel?
Per unit, yes. One block smelts 20 items vs. coal’s 8. Per inventory slot, a stack of dried kelp blocks (64) smelts 1,280 items, while a stack of coal smelts 512. The block of coal is still denser, but kelp is renewable and coal is not.
Can you eat a dried kelp block?
Not directly. You need to uncraft it into nine dried kelp items first. Once uncrafted, each piece restores half a hunger point.
Can dried kelp blocks be used in a composter?
No. The composter accepts dried kelp items but not the block form.
What is the best way to break a dried kelp block?
Any tool works, but a hoe is fastest in Java Edition. Bare hands take a little longer. The block has low hardness, so even an unenchanted tool clears it quickly.
Does kelp dry naturally over time?
No. Raw kelp only becomes dried kelp through smelting in a furnace, smoker, or campfire. There is no decay or aging mechanic that converts it on its own.
Can you push dried kelp blocks with pistons?
Yes. Pistons and sticky pistons move dried kelp blocks like any normal solid block. They have no special behavior.
One last note
If you are running a base that uses any kind of automated smelting, a kelp farm feeding into smokers is one of the lowest-effort, highest-output upgrades in the game. Build it once and you will not run out of fuel again.
