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Furnace
Furnaces, Blast Furnaces, and Smokers are all enchantable. Campfires, being infinitely fueled at the cost of speed, are not. Enchantments are not transferred when a Furnace is used to craft a Blast Furnace or Smoker.
Efficiency increases the speed at which smelting operations complete. Due to the fact that the furnace's operation is sped up, fuel also lasts a shorter amount of time.
Formula: cook time = base time * (1 + level / (2 + |level|))
| Enchantment Level | Seconds Per Smelt |
|---|---|
| 0 | 10 |
| 1 | 6.7 |
| 2 | 5 |
| 3 | 4 |
| 4 | 3.3 |
| 5 | 2.9 |
Unbreaking increases the duration that fuel lasts.
Formula: burn duration = base duration * (1 + level / (3 + |level|))
| Enchantment Level | Coal Burn Seconds | Blaze Rod Burn Seconds | Lava Bucket Burn Seconds |
|---|---|---|---|
| 0 | 80 | 120 | 1000 |
| 1 | 100 | 150 | 1250 |
| 2 | 112 | 168 | 1400 |
| 3 | 120 | 180 | 1500 |
Fortune adds a chance of increased results.
Formula: average = (level + 1) / 2 + 1 / (level + 2)
| Enchantment Level | Average Results |
|---|---|
| 0 | 1 |
| 1 | 1.33 |
| 2 | 1.75 |
| 3 | 2.20 |
Silk Touch causes furnaces to stop burning fuel when not in use. As soon as a valid recipe is detected, the furnace will resume again.
Silk Touch furnaces do not preserve remaining fuel when broken and replaced.