← Back to Blog · 2026-09-02 · 6 min read · Trading Education

Imagine this scenario: You correctly predict the bottom of the 2020 global oil crash, or you nail the exact top of the historic 2021 thermal coal rally. You got the direction right, the market moved your way, and yet… you still blew your trading account. How?

You sized your position like you were trading a standard Western CME micro contract, completely ignoring the contract multipliers and tick values unique to the Chinese exchanges.

If you want to trade Chinese commodity futures, importing your default Western position sizing logic will kill your account before the market even has a chance to test your thesis. The Shanghai Futures Exchange (SHFE) and the Dalian Commodity Exchange (DCE) have their own rules, their own multipliers, and their own margin structures. If you don't respect the math, a single adverse tick can wipe out a week's worth of gains. Let’s break down exactly how to calculate risk and size your positions when you trade rebar, iron ore, and other major Chinese contracts.

Why Standard Sizing Logic Fails on Chinese Commodity Futures

Most retail traders learn position sizing using a simple formula: Risk Amount / (Stop Loss Distance x Contract Multiplier) = Position Size. This is universally correct. The problem isn't the formula; it’s the inputs.

When trading Western markets, traders are used to standardized multipliers. A Micro Crude Oil contract is 100 barrels. An E-mini S&P 500 is $50 per point. But when you transition to Chinese commodity futures, the multipliers vary wildly across exchanges and products. A single lot of rebar is not the same exposure as a single lot of copper, even though both are industrial metals traded on the SHFE.

Furthermore, the leverage available on Chinese exchanges is often much higher than what global retail brokers offer on Western assets. Margins can be as low as 5% to 10% of the notional contract value. This creates a psychological trap: you can open massive positions with very little capital. But high leverage doesn't change your real risk—it only changes how fast you lose the money if your stop loss is hit.

Decoding SHFE and DCE Contract Specs

To size your trades correctly, you need to know three things about the specific contract you are trading: the contract multiplier, the tick size, and the tick value.

• Contract Multiplier: The physical amount of the commodity represented by one lot (e.g., 10 tons, 100 tons).
• Tick Size: The minimum price movement allowed by the exchange.
• Tick Value: The monetary value of one tick movement. (Tick Size x Contract Multiplier = Tick Value).

Let’s look at some of the most heavily traded contracts on the SHFE and DCE.

Notice the difference between Rebar and Iron Ore. Both are construction materials, deeply correlated to the Chinese real estate sector. But one lot of DCE Iron Ore is 100 tons, while one lot of SHFE Rebar is 10 tons. If you buy 10 lots of rebar, you control 100 tons. If you buy 10 lots of iron ore, you control 1,000 tons. If you treat them identically in your sizing model, you are taking on ten times the risk on the iron ore trade without realizing it.

The Position Sizing Formula for China Futures

Now that we have the specs, let's build the sizing model. When you trade Chinese commodity futures, you must calculate your position size based on your cash risk, not your available margin.

Here is the exact formula you should use before entering any ticket:

Max Lots = Account Risk Amount / (Stop Loss Distance in Price x Contract Multiplier)

Let's break down the variables:

1. Account Risk Amount: The actual cash you are willing to lose if your stop is hit. Usually 1% or 2% of your total account equity.
2. Stop Loss Distance in Price: The difference between your entry price and your stop loss price, expressed in the contract's native pricing (RMB/ton).
3. Contract Multiplier: The tons per lot (e.g., 10 for rebar, 100 for iron ore).

Notice what is missing from this formula: margin. Margin only dictates whether you have enough buying power to open the trade. It has absolutely nothing to do with how much risk you are taking. Never size a position based on how much margin you can afford. Size it based on how much you can afford to lose.

The Margin Trap: Notional Value vs. Real Risk

One of the biggest pain points for global retail traders entering the China futures market is the sheer leverage available. Because exchange margins are low, the notional value of the contracts you can control is massive.

For example, if copper is trading around 70,000 RMB per ton, one lot of SHFE Copper (5 tons) has a notional value of 350,000 RMB. With a 10% margin requirement, you only need 35,000 RMB to control that lot. If your account is 100,000 RMB, you could technically open nearly three lots of copper just by looking at your buying power.

But let's look at the risk. If your stop loss is 500 RMB away from your entry, your risk per lot is 500 x 5 = 2,500 RMB. If you open three lots, your total risk is 7,500 RMB. That’s 7.5% of your account on a single trade. If the market gaps through your stop, you could lose 10% or more in a single session.

The Chinese commodity markets can be highly volatile, driven by sudden domestic policy shifts or supply chain disruptions. You must respect the notional value. Just because the exchange lets you control 350,000 RMB with 35,000 RMB doesn't mean you should.

Practical Application: Sizing an Iron Ore Trade

Let’s put this into a real-world scenario. You are tracking the DCE Iron Ore contract. You believe a breakout is imminent, and you want to enter a long position.

Your Setup:

• Account Equity: $10,000 USD (roughly 70,000 RMB, assuming an exchange rate around 7.0 for simplicity).
• Risk Tolerance: 1% of the account. You are willing to risk $100 USD, which is approximately 700 RMB.
• Entry Price: 850 RMB/ton.
• Stop Loss Price: 835 RMB/ton. (A 15 RMB/ton stop distance).

The Calculation:

Using our formula: Max Lots = Account Risk Amount / (Stop Loss Distance x Contract Multiplier)

• Account Risk Amount = 700 RMB
• Stop Loss Distance = 15 RMB
• Contract Multiplier (Iron Ore) = 100 tons

Max Lots = 700 / (15 x 100) = 700 / 1500 = 0.46 lots.

Since you cannot trade fractional lots in Chinese commodity futures, you must round down to zero. You cannot take this trade with a 15 RMB stop loss while keeping your risk at 1%.

The Adjustment:

To take this trade, you have two choices: widen your stop loss, or increase your risk tolerance. Let's say you are comfortable risking 2% of your account (1,400 RMB) because the setup is highly probable.

New Calculation: 1400 / (15 x 100) = 1400 / 1500 = 0.93 lots.

Still not enough for a full lot. You must either drop down to a tighter stop loss (e.g., 10 RMB away, which gives you 1400 / 1000 = 1.4 lots, allowing you to trade 1 lot), or you need to wait for a better entry price that allows for a tighter stop.

This is the reality of trading DCE and SHFE contracts. The math forces discipline. You cannot force a trade if the contract's tick value and multiplier don't align with your account size and risk parameters.

Closing Thoughts

Position sizing is the ultimate defense mechanism in trading. When you trade rebar, iron ore, or copper on Chinese exchanges, you are stepping into a market with unique contract structures and high leverage. By mastering the relationship between tick size, contract multipliers, and your cash risk, you eliminate the guesswork. You stop gambling on notional value and start trading with mathematical precision.

If you want to prove your strategy works under these exact conditions, theory isn't enough. You need to test your system against real market data. You can take a real-data China futures evaluation at XS Select, with evaluation fees starting from just $29, to see if your position sizing logic holds up when the SHFE and DCE markets open. Build your edge, respect the math, and let the market prove you right.