ROC — Rate of Change

Overview

Rate of Change measures the percentage change in price over a specified period — the simplest momentum indicator that provides a clear picture of whether price acceleration is increasing or decreasing. ROC works across stocks, crypto, and forex, making it a versatile addition to any trading strategy. Use ROC divergence as an early warning signal alongside tools from our indicator guide library for multi-factor confirmation before entering a trade.

How It Works

ROC = [(Current Close − Close N periods ago) / Close N periods ago] × 100. Default period is 12. Positive ROC = price is higher than N periods ago (bullish). Negative ROC = price is lower (bearish).

Key Signals

• ROC crossing above zero = bullish momentum shift.
• ROC crossing below zero = bearish momentum shift.
• ROC extremes (unusually high or low) often precede corrections — mean reversion applies.
• ROC divergence from price warns of an impending reversal.

Common Mistakes

• Using ROC for precise entry timing — it's better for identifying momentum direction.
• Comparing ROC values across different securities without normalizing for their typical range.
• Ignoring the lookback period — 12-period ROC and 50-period ROC tell very different stories.