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Smelting cannonballs for profit
Buy bars, smelt each into 4 cannonballs at a furnace, and sell the cannonballs to cannon users. Steel cannonballs is the best right now at +493 gp per bar smelted (4 cannonballs), about +295,800 gp an hour after GE tax. At an assumed 600 bars smelted an hour (source below), 1 of the 2 options on this page make a profit after tax at current prices. Inputs are priced at instant buy and outputs at instant sell.
Data age: the oldest price used here is from a trade 2m ago. Prices refresh every minute.
Every option, priced now
| Option | Levels | Cost / action | Kept / action | Profit / action | Profit / hour (est.) | Per 4h buy limit | Output vol / 24h |
|---|---|---|---|---|---|---|---|
| Steel cannonballs | Smithing 35 | 535 | 1,028 | +493 | +295,800 | +4,930,000 on 10,000 | 27,744,520 |
| Adamant cannonballs | Smithing 75 | 1,877 | 852 | -1,025 | -615,000 | -10,250,000 on 10,000 | 872,127 |
Options whose prices are more than 6 hours old are left out. Cost per action is the inputs at instant-buy plus any NPC fee. Kept per action is the outputs at instant-sell minus the 2% GE tax. The 4h column is how many actions the tightest input buy limit allows every 4 hours, and what that many earn.
Assumptions
600 bars per hour, which is 2,400 cannonballs at a regular furnace with the single ammo mould, per the OSRS Wiki guides. A double ammo mould roughly doubles it.
Source: OSRS Wiki: Smithing steel cannonballs. Per-hour figures are estimates: real rates depend on your clicks, banking and connection.
Requirements: Dwarf Cannon quest and an ammo mould.
Inputs and outputs, with live prices
Steel cannonballs
 Steel bar | 1 × 535 | -535 |
 Steel cannonball | 4 × (262 - 5 tax) | +1,028 |
| Profit per bar smelted (4 cannonballs) | +493 |
Needs Smithing 35. Rate assumed: 600 per hour. Steel bar buy limit allows 10,000 per 4h, about 16.7 hours of work.
Adamant cannonballs
 Adamantite bar | 1 × 1,877 | -1,877 |
 Adamant cannonball | 4 × (217 - 4 tax) | +852 |
Questions
Is smelting cannonballs profitable right now?
Yes. Steel cannonballs is the best right now at +493 gp per bar smelted (4 cannonballs), about +295,800 gp an hour after GE tax.
How much gp per hour does smelting cannonballs make?
About +295,800 gp an hour with Steel cannonballs, assuming 600 bars smelted an hour. 600 bars per hour, which is 2,400 cannonballs at a regular furnace with the single ammo mould, per the OSRS Wiki guides. A double ammo mould roughly doubles it. This is an estimate at current prices, not a promise.
What levels do you need for smelting cannonballs?
From Smithing 35 up to Smithing 75, depending on the option. Dwarf Cannon quest and an ammo mould.
How many bars smelted does the GE buy limit allow?
For Steel cannonballs, the tightest input buy limit allows 10,000 bars smelted every 4 hours, worth +4,930,000 gp at current prices.
Offerbook prices methods from live Grand Exchange data; it never plays the game for you. gp only, and no promise of income: prices move, and steel cannonballs at +493 gp per bar smelted (4 cannonballs) can change within minutes. See all methods.