🔥 Blast Furnace Calculator
Calculate profit for every Blast Furnace bar using live GE prices. Assumes ice gloves + coal bag for maximum efficiency.
Bars/Hour
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Total Recipes
0
Profitable
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How the Blast Furnace Works
The Blast Furnace is a members-only minigame located in Keldagrim that lets you smelt bars using half the normal coal requirement. This means bars like steel (normally 2 coal) require only 1 coal, and runite (normally 8 coal) require only 4. The reduced coal cost is what makes Blast Furnace so profitable compared to regular smelting at a furnace.
You need 60 Smithing to use the Blast Furnace for free. Below level 60, you must pay the foreman 2,500 GP every 10 minutes. Ice gloves let you grab hot bars from the bar dispenser without waiting for them to cool. A coal bag from Motherlode Mine (costs 100 golden nuggets) is essential for efficiency — it holds 27 coal, letting you deposit coal and ore in a single trip.
The typical process: fill the coal bag, grab ore from your bank, deposit coal then ore onto the conveyor belt, and collect bars from the bar dispenser. With efficient banking, you can smelt about 4,500 bars per hour. Profit depends entirely on current GE prices for ores, coal, and bars. The calculator above uses live prices to show exact profit per bar and GP per hour for every bar type. For a detailed walkthrough, see our Blast Furnace profit guide.
Strategy Tips for Blast Furnace
World selection matters at the Blast Furnace. Dedicated Blast Furnace worlds (352, 355, 358, 386) have NPC-operated bellows and conveyor belt, saving you from hiring other players. Using the coal bag from Motherlode Mine is essential — it lets you deposit coal and ore in a single trip, nearly doubling your throughput.
For maximum GP/hr, compare gold bars (fast but require goldsmith gauntlets for best XP), adamantite bars, and runite bars. Gold bars offer the best Smithing XP rate but lower profit, while runite bars are the most profitable but require 85 Smithing. Stamina potions are important for maintaining run energy through banking trips — the cost is easily offset by the extra bars per hour.
Common Mistakes to Avoid
- Using the wrong world — Non-dedicated worlds require you to operate the furnace yourself or hire other players, drastically reducing bars per hour.
- Forgetting ice gloves — Without ice gloves, hot bars must cool before you can collect them, adding a significant delay each trip.
- Not using the coal bag — Skipping the coal bag means extra bank trips for coal, cutting your hourly rate nearly in half for multi-coal bars.
- Ignoring stamina potions — Running out of energy turns efficient runs into slow walks, negating the speed advantage of the Blast Furnace.
Frequently Asked Questions
What is the Blast Furnace in OSRS?
The Blast Furnace is a members-only minigame in Keldagrim that lets you smelt bars using half the normal coal requirement. It requires 60 Smithing (or a fee to the foreman below 60), ice gloves, and a coal bag for maximum efficiency.
What are the requirements for the Blast Furnace?
You need 60 Smithing to use it for free (or pay the foreman 2,500 gp every 10 minutes below 60). Ice gloves are strongly recommended to grab hot bars, and a coal bag from Motherlode Mine doubles your coal input per trip.
How much GP/hr can you make at the Blast Furnace?
Depending on the bar, you can make anywhere from 300K to over 1M GP/hr. Runite bars and adamantite bars are typically the most profitable, but steel bars offer the best balance of profit and speed at lower requirements.
Do you need ice gloves for the Blast Furnace?
Ice gloves are strongly recommended. Without them, bars come out hot and must cool down before collecting, significantly reducing bars per hour. You obtain ice gloves by killing the Ice Queen beneath White Wolf Mountain.
What is the best bar to smelt at the Blast Furnace for profit?
Runite bars are typically the most profitable at 85+ Smithing. Adamantite bars are the best mid-level option. Check the calculator above for current GP/hr with live prices, as the best bar changes with GE fluctuations.