Rate of Change (ROC)
Quick Definition
A momentum oscillator that measures the percentage change in price between the current price and the price a certain number of periods ago.
Key Takeaways
- ROC measures the percentage change in price over a specified number of periods
- Values above zero indicate positive (bullish) momentum; below zero indicates bearish momentum
- Divergences between ROC and price can signal potential reversals
- The lookback period determines the indicator's sensitivity to price changes
What Is Rate of Change (ROC)?
Rate of Change (ROC) is a momentum oscillator that calculates the percentage difference between the current closing price and the closing price n periods ago. The formula is simple: ROC = ((Current Price - Price n periods ago) / Price n periods ago) × 100. The indicator oscillates above and below zero — positive values indicate upward momentum, while negative values signal downward momentum. ROC is particularly useful for identifying overbought/oversold conditions, confirming trend strength, and spotting divergences between price and momentum. A rising ROC above zero confirms bullish momentum; a falling ROC below zero confirms bearish momentum. The choice of lookback period significantly affects the indicator's sensitivity — shorter periods (9-14) capture short-term momentum, while longer periods (25-200) identify intermediate or long-term trends.
Rate of Change (ROC) Example
- 1A stock trading at $110 with a 10-day ROC of 10% means it was at $100 ten days ago — strong upward momentum.
- 2When ROC crosses above zero while price breaks resistance, it confirms the bullish breakout with momentum support.
Related Terms
Relative Strength Index (RSI)
A momentum indicator measuring the speed and magnitude of price changes on a 0-100 scale, used to identify overbought or oversold conditions.
Stochastic Oscillator
A momentum indicator comparing a security's closing price to its price range over a specified period, identifying overbought and oversold conditions.
Moving Average Convergence Divergence (MACD)
A trend-following momentum indicator showing the relationship between two moving averages of a security's price.
Moving Average
A calculation that averages a security's price over a specific number of periods, smoothing price data to identify trends.
Bollinger Bands
A volatility indicator consisting of a middle moving average and two bands that expand and contract based on price volatility.
Support and Resistance
Key price levels where buying pressure (support) prevents further decline or selling pressure (resistance) prevents further advance.
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