Revision-pinned community calculator
Moonlight Peaks Copper Calculator
Use the Moonlight Peaks Copper calculator to enter the Copper Bars you want and the materials already in your inventory. It subtracts finished bars first, then works out Copper Ore, Charcoal, Wood, and optional Furnace materials without inventing an unknown processing time.
Recipe snapshot: fixed wiki.gg revision 7995 · checked July 13, 2026 · launch values may change
Inventory-gap planner
Plan Copper Bars and Furnaces
Every result is a material count, not a time estimate. Whole, non-negative values are used because partial items cannot satisfy a recipe.
Your material plan
What is still needed
You need to make 3 Copper Bars. The recipes require 12 Copper Ore and 3 Charcoal; with no Charcoal in inventory, that also means converting 3 Wood.
Fixed recipe snapshot
The values behind the calculator
These three records come from one reproducible community-wiki revision. They are useful launch data, but they are not a developer promise that recipes will never be balanced.
Copper Bar
4 Copper Ore + 1 Charcoal produces one recorded Copper Bar batch. The source leaves processing time blank, so this page calculates materials only.
Charcoal
1 Wood produces one recorded Charcoal batch in the Furnace. Owned Charcoal is subtracted before any Wood requirement is shown.
Furnace
15 Copper Ore + 5 Refined Stone is the recorded Workbench recipe. Optional Furnace demand is combined with bar demand before owned Ore is subtracted.
Recipe source: Moonlight Peaks wiki.gg, Farm Helpers revision 7995, checked July 13, 2026. The page is community maintained. We expose the revision instead of presenting its numbers as undocumented site knowledge.
Transparent math
How the Moonlight Peaks Copper calculator works
The planner starts with the finished result, not the raw materials. If you want five Copper Bars and already own two, it plans ingredients for three additional bars. It never breaks an owned bar back into Ore or Charcoal, and it never counts that bar twice. The bar deficit is therefore the larger of zero and your target minus the bars already owned.
Each missing bar contributes four Copper Ore and one Charcoal to recipe demand. Existing Charcoal is subtracted from that Charcoal demand. Only the remaining Charcoal gap becomes a Wood conversion requirement because the recorded recipe uses one Wood for one Charcoal. If you enter Wood already owned, the interface also shows whether you are short of Wood, but it keeps the conversion quantity visible so you know how much material must pass through the Furnace.
Furnaces are optional. Each new Furnace adds fifteen Copper Ore and five Refined Stone. The calculator combines Ore for bars and Ore for Furnace construction before applying your owned Ore. This matters: subtracting the same inventory separately from two plans would make one stack of Ore appear to cover both. Refined Stone applies only to the Furnace build in this first calculator.
The result deliberately stops there. The fixed source revision does not provide a verified processing duration for Copper Bars or Charcoal. Without that value, “bars per night,” “hours to finish,” and ideal machine counts would be guesses. Material arithmetic remains valid without pretending the missing time field is zero.
Worked inventory cases
Check the math before using your save
The examples show how finished items and ingredients are applied. They are calculations from the cited recipes, not claims about processing speed.
Three bars wanted, two owned
The finished-bar deficit is one. Making that bar calls for four Copper Ore and one Charcoal. If your raw-material inventory is empty, one Wood is also required to make that Charcoal.
Three bars, one Charcoal owned
Three bars call for twelve Ore and three Charcoal. One owned Charcoal reduces the Charcoal gap to two, so only two Wood needs converting. The owned Charcoal does not change Ore demand.
Two bars and one new Furnace
The bars need eight Ore and two Charcoal. The Furnace adds fifteen Ore and five Refined Stone, producing a combined twenty-three Ore demand before your inventory is subtracted.
Use it correctly
What this planner includes—and what it leaves unknown
This is an inventory-gap tool. It answers a narrow but repeatable question: given a target number of Copper Bars, optional new Furnaces, and the materials already owned, what recipe materials are still missing? It does not tell you the fastest mining route, a guaranteed Cave of Echoes spawn count, tool energy, machine throughput, or the moment a batch will finish.
Our research supports Cave of Echoes as a known Copper Ore location through a current community page and independent PC editorial corroboration, but the location dataset is not exhaustive and its map details are not fixed to the same revision as the recipes. For that reason, the calculator does not claim the cave is the only source, give an invented ore-per-floor figure, or turn an observed route into a universal farming rate.
Recipe balance can also change. If a later patch changes ingredient quantities, the visible revision and verification date make the old assumption easy to identify. Until a new reproducible source is reviewed, the tool should not silently replace one number or merge values taken from different game builds.
Copper FAQ
Questions the calculator should answer clearly
Answers refer to the fixed recipe snapshot above. A blank source field is never treated as zero.
How much Copper Ore is needed for one Copper Bar?
The recorded recipe needs four Copper Ore and one Charcoal for one Copper Bar. If you do not already have that Charcoal, the same fixed revision records one Wood as the input for one Charcoal. Processing time is blank in the source, so the tool can calculate the ingredients but not the time.
Does the calculator use Copper Bars I already own?
Yes. Owned finished bars are subtracted from the target first. If your target is three and you own two, the tool plans only one new bar: four Ore and one Charcoal. It does not dismantle finished bars, convert them into a fictional Ore value, or use more owned bars than the target requires.
How much does a Furnace cost to build?
The cited Farm Helpers revision records a Furnace Workbench recipe of fifteen Copper Ore and five Refined Stone. Enter the number of new Furnaces you actually intend to build. Ore for those machines is combined with Ore for your bar target before the calculator subtracts the Ore already in your inventory.
Why does the result show both Charcoal and Wood?
Copper Bars consume Charcoal, while Wood is the recorded input for producing Charcoal. Showing both preserves the recipe chain. Owned Charcoal is applied first; only the remaining Charcoal requirement becomes Wood to convert. Your owned Wood then determines whether you need to collect more Wood.
Where can I find Copper Ore?
Cave of Echoes is a known source in the research snapshot, supported by a community-maintained page and PC editorial corroboration. That does not prove it is the only source or establish a fixed yield. This page therefore avoids unsupported floor numbers, drop rates, daily totals, and claims about the most efficient route.
Why is there no Copper Bar time calculator?
The fixed recipe revision leaves processing time blank. Treating a blank as zero would create impossible unlimited throughput; borrowing a duration from another game or an old demo would be equally misleading. Once a current, reproducible duration is verified, time planning can be added as a separate assumption rather than hidden inside the material math.