Copper trading explained: Dr Copper, China, LME vs COMEX and CFD sizing

Copper trading means taking a position on the price of the red metal used in wiring, power grids, plumbing, motors and electronics, usually through a futures contract or a CFD that follows one. Because so much of it goes into construction and manufacturing, traders treat its price as a rough, real-time reading of global industrial demand, which is where the nickname "Dr Copper" comes from. For a retail trader the practical questions are which price your product follows (London or New York), what actually moves it, and how to size a position when contract specifications differ from one provider to the next.

This guide assumes you know the basics of futures and commodity CFDs. If not, start with how commodity futures work and CFDs on stocks, indices and commodities, then come back.

Why copper is called Dr Copper

The nickname is shorthand for the idea that copper has "a PhD in economics": because demand comes from building, power networks, cars, appliances and factories, its price tends to rise when the world economy is expanding and fall when activity slows. Market commentators often quote it as a growth signal alongside equity indices and bond yields.

Treat the label with some scepticism. Copper is also a market with its own supply problems, and those can dominate for months at a time:

• Mine disruptions. Strikes, accidents, water shortages, landslides and political disputes at large mines can remove supply with little warning.
• Smelting and refining bottlenecks. Ore has to be concentrated, smelted and refined. Treatment charges, the fees smelters earn for processing concentrate, rise and fall with how tight the ore market is.
• Policy. Export restrictions, royalties and, as 2025 showed, import tariffs can distort prices in one region without any change in global demand.
• Positioning and speculation. Funds treat copper as a macro and thematic trade, so price can move on changing views about electrification and grid spending long before physical demand changes.

So copper can rise in a slowing economy if mines are disrupted, and it can fall in a decent economy if supply arrives faster than expected. The doctor is useful, but not infallible.

Where the copper price comes from

There is no single copper price. Three exchanges dominate, and the price you see on a CFD platform is derived from one of them.

The London Metal Exchange (LME)

The LME is the oldest and most international copper market. Copper is quoted in US dollars per metric tonne and traded in lots of 25 tonnes. The LME has an unusual date structure: alongside monthly contracts, it trades a benchmark three-month contract, and physical metal sits in LME-approved warehouses in several countries. Producers and consumers around the world often price physical sales off LME settlement prices.

COMEX (CME Group)

In New York, the COMEX copper futures contract (ticker HG) covers 25,000 pounds of Grade 1 copper cathode and is quoted in US dollars and cents per pound. The minimum price move is $0.0005 per pound, worth $12.50 per contract. A micro contract of 2,500 pounds also exists. Many retail CFDs that quote copper in dollars per pound, with a price around a few dollars, are based on COMEX.

The Shanghai Futures Exchange (SHFE)

China's domestic copper futures are quoted in yuan per tonne. Most retail traders in Europe never trade them directly, but Shanghai prices, Chinese warehouse stocks and the gap between Shanghai and London prices are watched closely because they hint at whether Chinese buyers are importing or not.

Converting between quotes

One metric tonne is about 2,204.62 pounds. To compare a COMEX price with an LME price, multiply the per-pound price by 2,204.62. For example, an illustrative COMEX price of $4.50 per pound is about $9,921 per tonne. If the LME is trading at $9,700 at the same moment, New York is at a premium of roughly $221 per tonne, or around 2%. Small premiums of this kind reflect freight, delivery location, timing and local supply. Large ones usually mean something unusual is going on.

LME vs COMEX: the 2025 tariff episode

The clearest recent example of the two prices separating came in 2025, and it is worth understanding because it affected retail copper CFDs directly.

In early July 2025 the US administration announced a planned 50% tariff on copper imports. Traders had already been shipping copper into the United States ahead of any tariff, and COMEX prices rose well above the LME. ING and others put the COMEX premium at around 28% at its peak, with some estimates above 30%. On 30 July 2025 the White House clarified that refined copper, the cathode that COMEX delivers, would be exempt, with the tariff applied to semi-finished products and derivatives instead. COMEX copper fell by around a fifth in a single session, reported as its largest intraday fall on record, while the LME price barely moved. According to StoneX, the premium dropped from about $2,700 per tonne to under $50.

The lessons for a CFD trader are concrete:

1. Know which venue your CFD tracks. Someone long a COMEX-based copper CFD lost about a fifth of the notional value in a day. A trader long an LME-based product saw a much smaller move. The contract specification tells you which one you hold.
2. Charts can disagree. If your chart is based on one exchange and the news you read quotes another, the percentage moves will not match during periods like this.
3. Policy risk can be binary. A single announcement removed the premium almost entirely. Stops set a few percent away were jumped over in fast trading; see slippage explained.
4. Correlation between "the same" instrument can break. Anyone holding long COMEX and short LME as a supposedly low-risk spread was taking a large policy bet.

Tariff policy on refined copper was still subject to further US review at the time of writing, so check current news rather than assuming the 2025 settlement still applies.

What moves the copper price

China

China consumes roughly half of the world's refined copper by most industry estimates, far more than any other country, so its economy is the single largest demand factor. Traders watch:

• Property and construction. Housing starts, property sales and developer financing affect demand for wiring and plumbing.
• Grid and power investment. State grid spending and renewable installations use large amounts of copper.
• Manufacturing PMIs. The official and private Chinese PMI surveys give a monthly read on factory activity.
• Credit and stimulus. Announcements of infrastructure spending or monetary easing can move copper before any metal is actually used.
• Import data and exchange stocks. Monthly import figures and weekly Shanghai inventories show whether Chinese buyers are drawing on stock or rebuilding it.

Supply concentration

Mine supply is concentrated in a handful of countries, with Chile the largest producer and Peru, the Democratic Republic of the Congo and China also major sources. That makes copper exposed to labour negotiations, water and energy constraints in mining regions, and changes to mining law or taxation. New mines take many years to permit and build, so supply cannot respond quickly when prices rise.

The US dollar and global growth

Copper is priced in dollars, so a weaker dollar makes it cheaper for buyers using other currencies and tends to support demand at the margin; a stronger dollar works the other way. The relationship is loose and often swamped by other factors. Broader risk appetite matters too: in risk-off episodes copper usually falls alongside equities, because the market quickly prices weaker demand. Our guide to the US dollar index (DXY) explains how traders measure the dollar's broad moves.

Inventories

Exchange stocks at the LME, COMEX and Shanghai are published regularly. Falling stocks with steady prices can suggest tightening; rising stocks can suggest weak demand. Treat them with care: metal moves between exchanges and off-exchange storage for reasons of cost and arbitrage, as the 2025 flood of copper into US warehouses showed, so a change in one exchange's stocks does not always mean a change in global supply.

The energy transition theme

Electric vehicles, charging networks, wind and solar farms and grid upgrades all use more copper than the technologies they replace. This is a long-run demand story that many analysts discuss, and it helps explain why copper attracts speculative money. It is not a timing tool: the theme has been well known for years, and prices have still fallen sharply in several periods since it became popular.

Copper and currencies

Copper links to forex through producing and consuming countries. Chile's peso is often cited as sensitive to copper, and the Australian dollar is affected by industrial metals and Chinese demand more broadly, although iron ore matters more to Australia's exports. The links are inconsistent and interest-rate differentials usually dominate. The AUD/USD pair profile and the forthcoming guide to commodity currencies discuss this in more depth.

How retail traders get copper exposure

Copper CFDs

Most retail traders reach copper through a CFD. Providers design these differently, and three details matter more than the headline price:

• Underlying venue. COMEX-based CFDs usually quote in dollars per pound with four decimal places (for example 4.5000). LME-based CFDs quote in dollars per tonne (for example 9,700.00).
• Contract size. A COMEX-style CFD might be 1,000 pounds per contract, or 100, or 10. A tonne-based CFD might be 1 tonne per contract. The contract size determines what a one-cent or one-dollar move is worth, and it is the number people most often get wrong.
• Dated or rolling. A futures-based CFD expires with the underlying contract month; a rolling CFD is moved to the next month automatically, with a price adjustment at each roll and usually daily financing. The mechanics are the same as for oil and are explained in the oil trading guide.

Leverage limits

Under ESMA rules, applied in the EU, retail clients can use at most 10:1 leverage on commodity CFDs other than gold, meaning an initial margin of at least 10% of the position's notional value. The UK FCA applies the same cap. That is a ceiling, not a target: copper can move several percent in a day, and a 10% move at 10:1 equals the whole margin. See ESMA leverage limits and negative balance protection for the full rules.

Futures, shares and funds

Futures are standardised exchange contracts with exchange-set margins and real delivery obligations, and most retail brokers in Europe do not offer them. Shares in mining companies are another route, but they also carry company-specific risks such as costs, debt, management and jurisdiction, and diversified miners produce several metals. Exchange-traded products holding copper futures face the roll and curve effects described in how commodity futures work.

Worked example: sizing a copper CFD

The numbers below are illustrative, not current prices, and the contract terms are examples. Always use the terms in your own provider's specification.

You have a $10,000 account and decide to risk at most 1% on a trade, or $100.

A COMEX-style CFD quoted per pound

• Contract size: 1,000 pounds per contract.
• Quote: 4.5000 bid / 4.5040 ask. You buy at 4.5040.
• Value of a one-cent ($0.01) move: 1,000 × $0.01 = $10 per contract.
• Notional per contract: 1,000 × $4.504 = $4,504. Margin at 10:1 is $450.40.
• Your stop is at 4.3840, which is 12 cents below entry. Loss per contract at the stop: 12 × $10 = $120.
• Position size: $100 ÷ $120 = 0.83 contracts. If the minimum step is 0.1, you round down to 0.8 contracts, risking 0.8 × $120 = $96.

The position's notional value is 0.8 × $4,504 = $3,603.20, and the margin is about $360. Note how the sizing came from the stop distance, not from the margin. The instruments position size calculator does the same calculation if you enter the point value.

The same idea with a tonne-based CFD

• Contract size: 1 tonne per contract.
• Quote: around $9,920 per tonne (the same as $4.50 per pound).
• Value of a $1 move: $1 per contract.
• A 12-cent-per-pound stop is about $265 per tonne (0.12 × 2,204.62).
• Position size: $100 ÷ $265 = 0.377 contracts. With a step of 0.1 you round down to 0.3 contracts, risking about $79.50; with a step of 0.01 you could trade 0.37 contracts, risking about $98.

Same market, same stop, same risk budget, but the number on the order ticket is very different. If you copied "0.8" from the first example into the second product, you would be risking more than twice what you intended. This is why the contract specification is the first thing to read; the forthcoming guide to reading a CFD contract specification walks through one line by line.

When the stop does not hold

Return to the per-pound example: 0.8 contracts long from 4.5040 with a stop at 4.3840. Suppose news breaks over a weekend and the market opens on Monday at 4.3000. Your stop is triggered and filled at or near the opening price. The loss is (4.5040 − 4.3000) × 1,000 × 0.8 = $163.20, about 1.6% of the account rather than the planned 0.96%. On 30 July 2025 the COMEX move was far larger than this, which is why event risk belongs in sizing decisions. The gap and weekend risk guide covers how to plan for it.

Trading hours and liquidity

COMEX copper trades almost around the clock on CME Globex from Sunday evening to Friday afternoon New York time, with a short daily break. The LME has electronic trading through London hours and much of the Asian day, plus its traditional open-outcry "ring" sessions. Shanghai trades during the Chinese day and a night session. In practice:

• The Asian session often reacts first to Chinese data and policy news.
• The London morning is when LME activity is heaviest.
• The New York morning brings US data and the most COMEX volume.

CFD spreads are usually tightest when the underlying market is busiest and widen around the daily break, at the weekly open and over holidays. The instruments market hours tool shows the main exchange sessions in your time zone. Confirm your own provider's hours in the specification, as CFD hours do not always match the exchange exactly.

Costs of trading copper CFDs

• Spread. Industrial metal CFDs usually have wider spreads, as a percentage of price, than major forex pairs or gold.
• Commission. Some account types charge a commission instead of, or as well as, a wider spread.
• Overnight financing. Rolling CFDs charge or credit a daily amount based on the notional value and a benchmark rate plus a markup. Over weeks this can matter more than the spread.
• Roll adjustments. Rolling products adjust at each futures roll, sometimes with a fee.
• Currency conversion. Copper is priced in dollars, so profit and loss in a euro or sterling account is converted, as explained in currency conversion and account base currency.

Common mistakes

• Assuming one copper price. LME, COMEX and Shanghai prices usually move together but can separate, sometimes dramatically. Know which one your CFD follows.
• Copying lot sizes between products. A size that is sensible on one provider's copper CFD may be several times too large on another's.
• Using copper as a pure growth signal. Supply shocks and policy can move copper in the opposite direction to the economy.
• Ignoring Chinese hours and data. Big moves often start in Asian trading, while a European trader is asleep.
• Treating leverage as a target. At 10:1 a 10% move takes the whole margin. Size from the stop and the risk per trade.
• Holding rolling CFDs for months without counting financing. The daily charges add up.

Remember also that most retail CFD accounts lose money, and commodities are no exception. The risk warning explains why.

Frequently asked questions

Why is copper called Dr Copper?

Because its wide use in construction, power networks and manufacturing means its price tends to reflect changes in global industrial demand, as if it had a doctorate in economics. The signal is imperfect: mine disruptions, tariffs and speculative flows can move copper independently of the economy.

What is the difference between LME and COMEX copper?

The LME in London quotes copper in dollars per tonne with 25-tonne lots and is the main global reference for physical trade. COMEX in New York quotes in cents per pound with 25,000-pound contracts. The prices are normally close once converted, but local factors such as US import tariffs can open large gaps, as in July 2025.

How much does China matter to copper?

A great deal. China uses roughly half of the world's refined copper by most estimates, so its property market, grid investment, manufacturing activity, stimulus measures and import data are among the most closely watched copper drivers.

What leverage can I use on copper CFDs?

Retail clients in the EU and UK are limited to 10:1, meaning a 10% initial margin. Professional clients may be offered more but give up some retail protections. Lower effective leverage is common practice because copper can move several percent in a session.

How do I work out what a copper CFD move is worth?

Multiply the contract size by the price move. For a CFD of 1,000 pounds, a one-cent move is worth $10 per contract; for a CFD of 1 tonne, a $1 move is worth $1 per contract. Your provider's specification gives the contract size and the minimum trade size.

Do copper CFDs expire?

Futures-based copper CFDs expire with their underlying contract month, so you either close or roll before expiry. Rolling CFDs do not have an expiry date for you, but they include periodic roll adjustments and usually a daily financing charge.