Rate of Change (ROC): How to Read It
Rate of Change measures the percentage change in price over a set number of periods. It is a simple, direct way to see how fast price is moving and in which direction.
The formula
Common settings: 12 or 14 periods; 125 to 250 for long-term momentum
How to read it
- Positive ROC means price is higher than N periods ago.
- Negative ROC means price is lower than N periods ago.
- Rising ROC shows accelerating momentum.
- Crossing the zero line shows a momentum shift.
- Extreme readings relative to history can indicate stretched moves.
Typical signals
- ROC crossing above zero as bullish momentum.
- ROC crossing below zero as bearish momentum.
- Divergence between ROC and price as a warning sign.
Pitfalls to avoid
- Sensitive to the price N periods ago, which can create jumps.
- No fixed overbought or oversold levels.
- Noisy on short periods.
Strategies that use it
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Is ROC the same as momentum?
They are closely related; ROC expresses momentum as a percentage.
How do momentum investors use ROC?
They often rank assets by long-period ROC, such as 6 or 12 months.
Does ROC have fixed levels?
No. Traders compare readings with that asset's own history.
Works well with
Simple Moving Average
The Simple Moving Average adds up the last N closing prices and divides by N to create a smooth line. It filters out daily noise so the underlying direction of the trend is easier to see.
πMoving Average Convergence Divergence
MACD tracks the gap between a fast and slow EMA to reveal changes in trend momentum. A signal line and histogram make it easier to see when momentum is building or fading.
π‘οΈRelative Strength Index
The Relative Strength Index measures the speed and size of recent gains versus losses on a scale from 0 to 100. It helps spot when a market may be stretched too far in one direction.