Correlation
Risk ManagementA statistical measure of how two currency pairs move in relation to each other. Correlation ranges from +1.0 (move identically) to -1.0 (move in exact opposite directions), with 0.0 meaning no relationship.
Understanding Currency Correlation
Correlation tells you whether two pairs tend to move together, move opposite, or have no consistent relationship. EUR/USD and GBP/USD typically have a strong positive correlation (around +0.80 to +0.90), meaning they usually move in the same direction. EUR/USD and USD/CHF have a strong negative correlation (around -0.85 to -0.95), meaning when one rises, the other usually falls. These relationships exist because both pairs share a common currency (USD) and because the European and Swiss economies are closely linked.
Why Correlation Matters for Risk
If you go long both EUR/USD and GBP/USD simultaneously, you are not running two independent trades. Because of their high positive correlation, you are essentially doubling your USD-short exposure. If the dollar strengthens, both positions lose. This is a hidden risk that many traders overlook. Understanding correlations helps with Diversification: to truly spread risk, choose pairs with low or negative correlations.
Using Correlation in Practice
Before opening multiple positions, check the correlation between your pairs. If two pairs have a correlation above +0.70, consider treating them as a single risk exposure for Position Sizing purposes. You can also use negatively correlated pairs for Hedging: going long EUR/USD and long USD/CHF provides a natural partial hedge. The key is awareness: know your net exposure across all open positions, not just each trade in isolation.
Related Terms
Diversification
Spreading trading capital across multiple currency pairs, strategies, or timeframes to reduce the impact of any single losing trade or adverse market condition on overall performance.
Hedging
Opening a trade in the opposite direction of an existing position, or in a correlated instrument, to reduce exposure to adverse price movements. Hedging limits potential losses but also limits potential gains.
Currency Pair
Two currencies quoted together showing how much of one currency is needed to buy one unit of the other. EUR/USD = 1.0850 means 1 euro costs 1.0850 US dollars.