Currency Pair Correlation Calculator
Calculate currency pair correlation with our free Currency pair correlation Calculator. Compare rates, see projections, and make informed financial
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
r = Cov(X,Y) / (StdDev(X) × StdDev(Y))
The Pearson correlation coefficient divides the covariance of two return series by the product of their standard deviations. It produces a value between -1 (perfectly inverse) and +1 (perfectly aligned). R-squared (r²) gives the proportion of variance explained.
Worked Examples
Example 1: EUR/USD vs GBP/USD Positive Correlation
Problem:Given 10 daily returns for EUR/USD (0.5, -0.3, 0.8, -0.1, 0.4, -0.6, 0.2, 0.7, -0.4, 0.3) and GBP/USD (0.4, -0.2, 0.6, -0.3, 0.5, -0.5, 0.1, 0.8, -0.3, 0.2), calculate correlation.
Solution:Mean EUR/USD = 0.15, Mean GBP/USD = 0.13\nCovariance = 0.1539\nStd EUR/USD = 0.4647, Std GBP/USD = 0.4163\nCorrelation = 0.1539 / (0.4647 × 0.4163) = 0.9547\nR-squared = 91.14%
Result:Correlation = 0.9547 (Very Strong Positive) | R² = 91.14%
Example 2: Hedge Ratio Calculation
Problem:EUR/USD and USD/CHF have correlation -0.92, StdDev 0.45% and 0.40% respectively. Calculate hedge ratio for a $100,000 EUR/USD position.
Solution:Hedge Ratio = -(corr × StdDev1 / StdDev2)\n= -(-0.92 × 0.45 / 0.40) = 1.035\nHedge Size = 1.035 × $100,000 = $103,500\nDiversification benefit with hedge ≈ 38%
Result:Hedge Ratio = 1.035 | Hedge Size = $103,500 USD/CHF long
Frequently Asked Questions
What is currency pair correlation in forex trading?
Currency pair correlation measures how two currency pairs move in relation to each other over a given time period. The correlation coefficient ranges from +1.0 (perfectly positively correlated, moving in the same direction) to -1.0 (perfectly negatively correlated, moving in opposite directions), with 0 indicating no relationship. For example, EUR/USD and GBP/USD often show positive correlation because both are quoted against the US dollar. Understanding correlations helps traders avoid doubling risk by taking similar positions in correlated pairs, identify hedging opportunities using negatively correlated pairs, and build diversified portfolios that reduce overall risk exposure in the forex market.
How do you calculate the Pearson correlation coefficient?
The Pearson correlation coefficient (r) is calculated by dividing the covariance of two data sets by the product of their standard deviations. The formula is: r = sum((xi - mean_x)(yi - mean_y)) / sqrt(sum((xi - mean_x)^2) * sum((yi - mean_y)^2)). First, compute the mean of each data set. Then, for each observation, calculate the deviation from the mean for both series. Multiply corresponding deviations, sum them for the covariance numerator. Separately, square each deviation and sum them for the denominator components. The resulting coefficient is bounded between -1 and +1 and is dimensionless, making it easy to compare correlations across different pairs regardless of their pip values or volatilities.
Why do currency correlations change over time?
Currency correlations are dynamic and shift due to evolving macroeconomic conditions, central bank policies, geopolitical events, and market sentiment changes. For instance, during risk-off events, traditionally uncorrelated pairs may become highly correlated as investors flee to safe-haven currencies simultaneously. Changes in interest rate differentials between countries alter carry trade dynamics, shifting correlations. Commodity price swings affect commodity-linked currencies (AUD, CAD, NZD) differently depending on which commodities are moving. Trade policy changes, economic divergence between regions, and shifts in capital flows all contribute. Traders should regularly recalculate correlations using rolling windows rather than relying on static historical values.
How can traders use correlation for hedging?
Traders use negative correlations to hedge existing positions and reduce portfolio risk. If you hold a long EUR/USD position, you could hedge by going long on USD/CHF, which historically has a strong negative correlation with EUR/USD. The hedge ratio determines the position size: Hedge Size = -(correlation * StdDev_pair1 / StdDev_pair2) * Position_pair1. A perfect hedge (correlation of -1.0) eliminates directional risk but also eliminates profit potential. Partial hedges using moderately negatively correlated pairs (-0.5 to -0.8) reduce risk while retaining some profit potential. Traders should monitor correlation stability, as correlations can break down during high-volatility events precisely when hedging is most needed.
References
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy