Currency Correlation in Forex
Currency correlation measures how two forex pairs move in relation to each other. If EUR/USD and GBP/USD both go up when the USD weakens, they are positively correlated. If EUR/USD goes up while USD/CHF goes down, they are negatively correlated. Understanding correlations prevents you from accidentally doubling your risk without realizing it.
Currency Correlation Tables — Key Relationships
Correlations are measured from -1.0 (perfect inverse) to +1.0 (perfect positive). Values above ±0.70 are strong correlations.
Strongly positive correlations (move together):
- EUR/USD and GBP/USD: ~0.85–0.92. Both fall when USD strengthens.
- AUD/USD and NZD/USD: ~0.90–0.95. Both are commodity currencies sensitive to China demand.
- EUR/USD and AUD/USD: ~0.65–0.80. Both vs. USD.
Strongly negative correlations (move opposite):
- EUR/USD and USD/CHF: ~-0.90 to -0.95. Classic inverse pair.
- EUR/USD and USD/JPY: ~-0.50 to -0.70. Both USD pairs but different driver dynamics.
- EUR/USD and DXY: ~-0.95. EUR/USD is essentially inverted DXY.
Near-zero correlation (independent):
- EUR/USD and USD/CAD: ~-0.40 to -0.60. CAD has oil correlation that EUR lacks.
- GBP/USD and USD/JPY: variable, often weak.
Correlations change over time — check regularly using resources like myfxbook.com/forex-market/correlation or a broker's correlation tool.
The Doubled Risk Problem
The mistake: Buying EUR/USD AND GBP/USD at the same time.
Both pairs are 85%+ correlated. If the USD strengthens and EUR/USD drops 50 pips, GBP/USD will likely drop 40–60 pips simultaneously. You have effectively doubled your USD short position while thinking you have two separate trades.
Real exposure: Two 0.1 lot long trades on EUR/USD and GBP/USD ≈ one 0.2 lot long trade on a "USD weak" position. The diversification is largely illusory.
How to avoid it:
- If you are trading a USD weakening thesis, pick ONE USD pair — the one with the best setup. One EUR/USD trade is sufficient.
- Alternatively, understand you are doubling the position and size each trade at 0.5× your normal size.
Legitimate use of correlated pairs:
Some traders intentionally trade correlated pairs as a hedge. Example: long EUR/USD (bullish EUR), short USD/CHF (also bullish EUR — CHF and EUR often move together). The correlation provides a partial natural hedge while maintaining directional exposure.
Pairs That Provide True Diversification
For genuinely diversified multi-pair exposure, choose pairs with low or negative correlation to each other:
Low-correlation combination example:
- EUR/USD (USD/EUR dynamics)
- USD/JPY (risk-on/risk-off + BOJ dynamics)
- AUD/CAD (two commodity currencies, no USD in either)
- XAU/USD (gold — different driver set)
These four have reasonably independent price drivers and lower pairwise correlations than EUR/USD + GBP/USD + AUD/USD simultaneously.
The carry pair consideration:
AUD/JPY and EUR/JPY are both heavily influenced by global risk sentiment — they move together during risk-off events (both fall sharply). Avoid combining JPY crosses in the same direction during volatile periods.
Practical rule for most traders: If you trade more than one position simultaneously, ensure they are either:
1. Different currency dynamics (not all vs USD)
2. Different timeframes (different trade horizons)
3. Intentionally hedged rather than accidentally correlated
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