HOW IT WORKS
How to use this tool
- 1Choose a fuel and a furnace type that supports your recipe.
- 2Enter the full item batch and the number of independent parallel furnaces.
- 3Read total fuel units and the time until the entire batch finishes.
Minecraft
Minecraft Smelting Calculator
Calculate fuel required and batch time for Minecraft furnaces, blast furnaces, and smokers. A block of coal smelts 80 items; 1 single coal smelts 8 items.
Last updated:
Local browser processing • no upload required
Choose fuel, batch size, parallel furnace count and the correct recipe-compatible furnace type.
Smelting results
- Items per fuel unit
- 8
- Fuel units required
- 8
- Batch completion time (seconds)
- 640
- Batch completion time (game ticks)
- 12800
Assumes 20 TPS, even item distribution and continuous fuel. Fuel rounds up per furnace. Blast furnaces/smokers only accept eligible recipes; startup and transport are excluded.
Next Creation Steps
Worked example
How much coal and time does a stack need?
Plan the entire batch. Fuel is rounded up per furnace, with items distributed as evenly as possible.
- Select coal, 64 items and one regular furnace: 8 coal and 640 seconds. One coal smelts 8 items; one blaze rod 12; one dried kelp block 20.
- Choose four furnaces for the same batch: each receives 16 items, the total still needs 8 coal, and all four finish in 160 seconds.
- For 65 items and four furnaces, the 17/16/16/16 split needs 9 coal and 170 seconds. A blast furnace or smoker halves time for compatible recipes, without changing fuel capacity.
Quick answer
How many items does one coal smelt?
One coal or charcoal smelts 8 items; a coal block 80; a lava bucket 100; a blaze rod 12; a dried kelp block 20. Blast furnaces and smokers preserve these capacities for eligible recipes.
Key specifications
- Processing
- In your browser
- Tool files
- Processed on your device
- Access
- Free; no account required
- Result
- On-screen calculation; no file export
Sources
FAQ
FAQ
How many items does one coal smelt?
One coal or charcoal smelts 8 items; a coal block 80; a lava bucket 100; a blaze rod 12; a dried kelp block 20. Blast furnaces and smokers preserve these capacities for eligible recipes.
How long does smelting one item take?
Most ores and food take 200 ticks, which is 10 seconds. Blast furnaces and smokers are twice as fast.
What is the most efficient fuel in Minecraft?
Lava buckets give the most items per unit, while dried kelp blocks and coal blocks give the best items per resource farmed.
Can different fuels mix in one furnace?
Yes, but fuel is consumed one unit at a time, so a coal finishes before a lava bucket starts.
How many furnaces do I need for a big smelting run?
Distribute items evenly across independent furnaces. Completion time follows the busiest furnace; fuel must be rounded up separately for each furnace. This calculator reports both for the complete batch.