Stock & ETF Correlation Calculator

Stock correlation measures how two stocks move in relation to each other, ranging from -1 (perfect negative correlation) to +1 (perfect positive correlation). It matters for portfolio diversification because stocks with low or negative correlations can help reduce overall portfolio risk. Our calculator helps you identify these relationships to build a more balanced portfolio.

Our correlation calculator uses real-time price data from MarketXLS's institutional-grade database to calculate precise correlation coefficients. The accuracy depends on the time period selected - longer periods generally provide more stable correlations. We use standard statistical methods (Pearson correlation) to ensure results match professional financial analysis tools.

Daily correlations use daily price changes and are more sensitive to short-term market movements. Weekly correlations smooth out daily volatility and show medium-term relationships. Monthly correlations reveal long-term relationships between stocks. For portfolio construction, weekly or monthly correlations often provide more stable insights than daily correlations.

This calculator is designed for investors, portfolio managers, and financial analysts who need to analyze relationships between stocks and ETFs. Whether you're optimizing portfolio diversification, analyzing sector correlations, or studying market relationships, our professional-grade tool provides the accurate data and visualizations you need. No registration required - start analyzing immediately.

To diversify effectively, look for stocks with low correlations (between -0.3 and 0.3) or negative correlations. Avoid portfolios with only highly correlated stocks (above 0.7) as they tend to move together. Mix stocks from different sectors, market caps, and geographies to achieve better diversification. Our heatmap visualization makes it easy to identify these relationships at a glance.