Minecraft Fuel Calculator
Plan a smelting batch, compare fuels and distribute items across a furnace array.
Your smelting plan
- 64
- Coal / charcoal needed
- 10m 40s
- Batch time
- 0
- Unused smelt capacity
Load 64 items into each of 8 active furnaces.
Fuel is rounded up for each machine separately. Spare capacity burns away if input stops. Timing assumes continuous input, empty outputs and evenly distributed items; hopper delays and server lag are not included.
Compare fuel costs
| Fuel | Items / fuel | Fuel needed | Spare capacity |
|---|---|---|---|
| Coal / charcoal | 8 | 64 | 0 |
| Block of coal | 80 | 8 | 128 |
| Lava bucket | 100 | 8 | 288 |
| Dried kelp block | 20.005 | 32 | 128.16 |
| Blaze rod | 12 | 48 | 64 |
| Overworld planks | 1.5 | 344 | 4 |
| Overworld wooden slab | 0.75 | 688 | 4 |
| Stick | 0.5 | 1,024 | 0 |
| Bamboo | 0.25 | 2,048 | 0 |
Java 26.2 gives dried kelp blocks one extra furnace burn tick. That fractional capacity is included; faster machines round burn time down to whole ticks.
About Minecraft Fuel Calculator
Calculate Minecraft furnace fuel and smelting time. Compare coal, lava, kelp and other fuels, including waste when splitting items across multiple furnaces.
Frequently asked questions
- Do blast furnaces and smokers use less fuel?
- For their supported recipes, they process items twice as quickly but process the same number of items per fuel. This calculator rounds fuel separately for each machine and assumes continuous input at 20 ticks per second.