Smelting turns raw ore into the metal, sulfur and high-quality metal that builds and arms everything in Rust. This guide covers the furnace types, how wood fuel and charcoal work, smelt times for each ore, and how to refine low grade fuel — with the numbers you need to size a furnace setup.
Furnace types compared
| Furnace | Fuel | Wood per ore | Best for |
|---|---|---|---|
| Furnace | Wood | ~0.5 | Early game, small batches, movable |
| Large Furnace | Wood | ~0.7 | Bulk smelting; smelts HQM ~5× faster |
| Electric Furnace | Electricity (no wood) | 0 | Automated, fuel-free late-game setup |
Most players run several standard furnaces early, then graduate to a large furnace (or an electric one) as metal demand grows.
Smelt times per ore
| Ore | Smelts into | Time per ore |
|---|---|---|
| Metal ore | Metal Fragments | 2.5 seconds |
| Sulfur ore | Sulfur | 2.5 seconds |
| HQM ore | High Quality Metal (1:1) | 10 seconds |
A full stack of 1,000 metal ore takes only about 2–3 minutes in a furnace running at capacity; the same in HQM takes far longer, which is why HQM is the resource you plan around.
Fuel: wood and charcoal
Furnaces burn wood for heat — and as a by-product produce charcoal, which you need for gunpowder. Every piece of wood burned has roughly a 75% chance to yield charcoal, so a 5,000-wood smelt banks around 3,750 charcoal. A running furnace is therefore also a charcoal factory. The common beginner mistake is over-fuelling: add only as much wood as the smelt needs, or the fuel outlasts the ore and you waste wood.
Low grade fuel
Low grade fuel powers tools, lanterns and most vehicles. It isn’t smelted in a furnace — it’s refined from crude oil at a Refinery. Crude comes from pump jacks, crude barrels at monuments, and the seabed, so set up a refinery once you start running vehicles (see the vehicles guide).
Get exact smelt amounts
Wood needed, smelt time and output all depend on batch size and furnace type. Our free Rust Smelting Calculator gives exact fuel and time for any batch, so you don’t waste wood or stand around waiting.
Frequently asked questions
How long does ore take to smelt in Rust?
Metal ore and sulfur ore each take 2.5 seconds, and HQM ore takes 10 seconds — four times longer. A furnace processes multiple ore in parallel, so a 1,000 metal-ore stack finishes in about 2–3 minutes, while the same quantity of HQM takes much longer.
Small furnace or large furnace?
Small furnaces are cheaper, movable and slightly more wood-efficient per ore (~0.5 vs ~0.7 wood). The large furnace wins on throughput — it processes far more at once and smelts HQM roughly 5× faster — so use small furnaces early and a large furnace once you’re farming HQM and bulk ore.
How do I get charcoal in Rust?
Burn wood in any furnace or campfire — each piece has about a 75% chance to leave charcoal. You don’t craft it directly; it accumulates as you smelt, which conveniently stocks the charcoal you’ll need for gunpowder.
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