Do you know if your trades are secretly doubling up on the same risk? Currency correlation measures how closely two currency pairs move together. Ignoring it leads to hidden overexposure.
Understanding Correlation Values
| Correlation | Strength | Meaning |
|---|---|---|
| +0.80 to +1.00 | Very Strong | Move almost identically |
| +0.50 to +0.79 | Strong | Usually move together |
| +0.20 to +0.49 | Weak | Some relationship |
| -0.20 to +0.20 | None | Independent |
| -0.50 to -0.79 | Strong Inverse | Move opposite |
| -0.80 to -1.00 | Very Strong Inverse | Mirror opposite |
Common Correlations (Typical Values)
| Pair 1 | Pair 2 | Correlation | Note |
|---|---|---|---|
| EUR/USD | GBP/USD | +0.70 | Both dollar-quoted, both European |
| USD/JPY | USD/CHF | +0.80 | Both dollar-based, safe havens |
| EUR/USD | USD/CHF | -0.90 | Inverted quote, mirrored |
| GBP/USD | USD/JPY | +0.30 | Weak, unrelated drivers |
| XAU/USD | USD/JPY | -0.40 | Gold negative to rising USD |
How to Manage Correlated Risk
If you take two correlated long positions:
Say EUR/USD long + GBP/USD long (correlation +0.70)
Your effective exposure is ~1.7× what you intended. A 1% EUR/USD win = roughly 0.7% GBP/USD win, but the reverse holds for losses too.
Best practices:
- Diversify pairs — trade EUR/USD + USD/JPY (low correlation) instead of EUR/USD + GBP/USD
- Scale down — if pairs are correlated, reduce each position by 50%
- Use a correlation matrix — check daily before opening multiple positions
- Avoid trading correlated Pairs in the same direction unless you've sized for it
Weekend Correlation Check Routine
Every Saturday:
1. Pull 1-week correlation for all active pairs
2. Review open positions for overlap
3. Reduce correlated positions before Monday open
4. Adjust stop losses accordingly
Understanding correlation = controlling your real risk.
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