Minecraft Furnace Fuel Calculator
One smelt takes 200 ticks, and every fuel burns for a fixed time — a lava bucket does 100 items, coal does 8, a plank does one and a half. Enter how many items you are smelting and this shows exactly how much of each fuel that takes, so you stop overshooting on charcoal or wasting a bucket of lava on half a stack.
| Fuel | Smelts | Need |
|---|---|---|
| Lava bucket | 100 | 1 |
| Block of coal | 80 | 1 |
| Dried kelp block | 20.005 | 4 |
| Blaze rod | 12 | 6 |
| Coal | 8 | 8 |
| Charcoal | 8 | 8 |
| Bamboo block | 1.5 | 43 |
| Log or planks (not crimson or warped) | 1.5 | 43 |
| Wooden slab (not crimson or warped) | 0.75 | 86 |
| Stick | 0.5 | 128 |
| Bamboo | 0.25 | 256 |
One smelt takes 200 ticks (10s). Fuel burns whole units, so any leftover burn time on the last piece is wasted — a lava bucket poured into 1 item still costs the whole bucket.
Smokers and blast furnaces cook twice as fast and burn fuel twice as fast, so each fuel smelts the same number of items there, in half the time. Crimson and warped wood never burns.
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