Calculator
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.
Calculator
Furnace Fuel Calculator
Furnace time
10m 40s
| Fuel | Smelts | Need |
|---|---|---|
| Lava bucket | 100 | 1 |
| Block of coal | 80 | 1 |
| Dried kelp block | 20 | 4 |
| Blaze rod | 12 | 6 |
| Coal | 8 | 8 |
| Charcoal | 8 | 8 |
| Bamboo block | 1.5 | 43 |
| Any log or planks | 1.5 | 43 |
| Wooden slab | 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.