Correlated positions: a 4-step check for when three trades are really one
The Farol Markets team · 29 October 2026 · 5 min read · How we write
In short
- Rewrite each trade as a bet on each currency.
- Add the risk of every trade that shares the same exposure.
- Cap each group, for example at 2% in total.
You open three trades, each risking 1%, and feel diversified. Then the US dollar jumps on one data release and all three hit their stops in the same minute. They were never three ideas: they were one bet against the dollar, at 3% risk. Correlation is the risk that hides between positions.
What correlation means for a trader
Two markets are positively correlated when they tend to move in the same direction, and negatively correlated when they tend to move in opposite directions. In forex, pairs that share a currency are often correlated: EURUSD and GBPUSD have historically tended to move together, while EURUSD and USDCHF have often moved in opposite directions. These relationships are tendencies, not laws, and they change over time.
The 4-step check
Step 1: write each trade as a currency bet. Long EURUSD = long EUR, short USD. Short USDCHF = short USD, long CHF.
Step 2: group by the shared exposure. Every trade that is short USD belongs to the same group, whatever the pair.
Step 3: add the risk per group.
| Trade | Bet | Risk |
|---|---|---|
| Long EURUSD | Short USD | 1% |
| Long GBPUSD | Short USD | 1% |
| Short USDCHF | Short USD | 1% |
| "Short USD" group | 3% |
Illustrative calculation, not an expectation of results.
Step 4: cap the group. A common rule is a maximum per theme, for example 2% in total for any single currency or idea. Above the cap, skip the new trade or reduce the sizes so the total fits.
How to see correlation without special software
- Overlay the two charts on the same timeframe and look at the last few weeks.
- Many platforms and some free websites show a correlation coefficient: close to +1 means they move together, close to −1 opposite. Use it as a guide, not a guarantee.
- Gold, indices and crypto can also be linked to the dollar or to general risk sentiment on some days.
Size each trade, then the whole book
Size each position from its stop with the lot size calculator, then add the group. Check the reward side with the risk/reward calculator: three correlated trades don't triple the chance of being right. They triple the cost of being wrong. Correlated groups are also how traders reach their daily loss limit in minutes, and on a news release the stops can slip together (see slippage and gaps).
In short
Count risk per idea, not per ticket. Rewrite every trade as a currency bet, group what is shared, add the risk and cap each group. Diversification is only real when the positions can lose for different reasons.
Questions people also ask
What does correlation mean in forex?
The tendency of two pairs to move in the same or opposite direction, often because they share a currency. It changes over time.
How much total risk per idea?
Many plans cap a single currency or theme at around 2% of the account, whatever the number of trades.
Are negatively correlated trades a hedge?
Only partly and not reliably. Correlations can break on news days, so count both risks.
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