RSI, MACD & Momentum Indicators
Deep dive into momentum indicators: RSI, MACD, Stochastic, Williams %R, and how to use Diplyzer to spot overbought/oversold conditions, divergences, and momentum crossovers across any asset.
Momentum indicators measure the speed and strength of price movement. They answer a question that price alone cannot answer: is this trend gaining or losing momentum? And critically — is the price move about to exhaust itself?
Mastering momentum oscillators is the difference between chasing tops and bottoms versus entering trades when momentum genuinely supports your direction.
RSI: The Relative Strength Index
The RSI is the single most widely used momentum indicator in trading. Developed by J. Welles Wilder in 1978, it measures the magnitude of recent gains versus losses on a 0–100 scale.
The Calculation: RSI = 100 – (100 / (1 + RS)), where RS = Average Gain / Average Loss over the period. The default period is 14.
Reading RSI Levels
| RSI Level | Interpretation |
|---|---|
| Above 70 | Overbought — buyers may be exhausting; pullback or consolidation likely |
| 50–70 | Bullish momentum zone — trend is up, buyers in control |
| 50 | Neutral — neither buyers nor sellers have a clear edge |
| 30–50 | Bearish momentum zone — trend is down, sellers in control |
| Below 30 | Oversold — sellers may be exhausting; potential reversal or bounce |
Important nuance: In a strong uptrend, RSI can remain above 70 for extended periods. In a strong downtrend, it can remain below 30 for extended periods. Overbought/oversold readings are signals to watch for reversals — not automatic reversal guarantees.
Ask Diplyzer:
"What is the current RSI reading for [ticker] on the daily chart? How has RSI behaved over the last 6 months — has it reached overbought or oversold territory recently?"
RSI Divergence: The Most Powerful Signal
Divergence occurs when price and RSI move in opposite directions. This is one of the most reliable warning signals in all of technical analysis.
Bearish Divergence: Price makes a higher high, but RSI makes a lower high. Interpretation: price is reaching new heights, but the underlying momentum is weakening. Sellers are beginning to outpace buyers at the margin. A reversal may be near.
Bullish Divergence: Price makes a lower low, but RSI makes a higher low. Interpretation: price is still falling but with decreasing momentum. Buyers are beginning to absorb the selling. A reversal to the upside may be near.
Divergences on higher timeframes (daily, weekly) are significantly more powerful than those on lower timeframes.
Ask Diplyzer:
"Is there any RSI divergence on [ticker] on the daily or weekly chart? Show me where price and RSI are moving in opposite directions."
MACD: Moving Average Convergence Divergence
The MACD is a trend-following momentum indicator that shows the relationship between two exponential moving averages — specifically the 12 EMA and 26 EMA. It consists of three components:
- MACD Line: The difference between the 12 EMA and 26 EMA
- Signal Line: A 9 EMA of the MACD Line (slower)
- MACD Histogram: The difference between the MACD Line and the Signal Line (visualizes the gap between them)
MACD Signals
Bullish Crossover: MACD Line crosses above the Signal Line → momentum has shifted bullish. Particularly powerful when the crossover occurs below the zero line (deeply negative MACD).
Bearish Crossover: MACD Line crosses below the Signal Line → momentum has shifted bearish. Particularly powerful when the crossover occurs above the zero line (deeply positive MACD).
Zero Line Cross: When the MACD Line crosses the zero level, the 12 EMA and 26 EMA have met. A cross above zero confirms bullish trend; below zero confirms bearish trend.
Histogram Expansion/Contraction:
- Expanding histogram (bars getting taller) → momentum is increasing in the current direction
- Contracting histogram (bars getting shorter) → momentum is fading; potential reversal
MACD Divergence
Like RSI, MACD shows divergence when price and MACD move in opposite directions — often an early warning of trend exhaustion.
Ask Diplyzer:
"Show me the MACD for [ticker] on the daily chart for the last 6 months. Have there been any bullish or bearish crossovers recently? Is the histogram expanding or contracting right now?"
"Is there any MACD divergence on [ticker]'s weekly chart? Is the price trend being confirmed or contradicted by MACD momentum?"
Stochastic Oscillator
The Stochastic compares a security's closing price to its price range over a given period, generating an oscillator between 0 and 100.
- Above 80 — Overbought
- Below 20 — Oversold
- %K line — The main "fast" line
- %D line — A 3-period moving average of %K (the "slow" line, used as a signal line)
Key signal: When %K crosses above %D in oversold territory (below 20) → bullish. When %K crosses below %D in overbought territory (above 80) → bearish.
The Stochastic is particularly useful for identifying short-term momentum shifts and timing entries within a broader trend identified by a longer-term indicator.
Ask Diplyzer:
"Show me the Stochastic RSI for [ticker] on the 4-hour chart. Is it in oversold territory? Has the %K crossed above %D in a way that suggests a bounce is forming?"
Williams %R
Williams %R is similar to the Stochastic but inverted. It measures where the current close is relative to the highest high over a look-back period.
- Reads from 0 to -100
- -80 to -100 — Oversold (potential bullish reversal zone)
- -20 to 0 — Overbought (potential bearish reversal zone)
Particularly useful for identifying turning points in market cycles and confirming RSI readings.
Ask Diplyzer:
"Show me Williams %R for [ticker] on the daily chart. How does it compare to the RSI reading? Are both confirming an oversold condition?"
CCI: Commodity Channel Index
The CCI measures the deviation of price from its statistical average. While originally developed for commodities, it works across all markets.
- Above +100 — Overbought; potential trend reversal
- Below -100 — Oversold; potential trend reversal
- Readings between -100 and +100 — Normal price oscillation
The CCI is useful for identifying cyclical turns and confirming trend strength when price moves significantly beyond its statistical average.
Combining Momentum Indicators for Confluence
Individual momentum indicators work. Multiple momentum indicators confirming the same signal work better.
A high-conviction momentum setup:
- RSI approaching or just turning up from below 30 (oversold)
- MACD showing a bullish crossover below the zero line
- Stochastic %K crossing above %D while below 20
- Price at a key technical support level or SMC order block
When all four align simultaneously, the probability of a sustained reversal is significantly elevated.
Ask Diplyzer:
"Show me [ticker] on the daily chart with RSI, MACD, and Stochastic RSI all plotted. Are any of them simultaneously signaling an oversold condition? Is there momentum convergence that suggests a potential reversal?"
Momentum Indicators Across Timeframes
Momentum indicators work differently across timeframes:
Short timeframes (5-min, 15-min, 1-hour): Fast signals; many false positives; useful for entry timing within a broader setup.
Medium timeframes (4-hour, daily): The most useful for swing trading; balanced between speed and reliability.
Long timeframes (weekly, monthly): Very powerful but rare signals; divergences on these timeframes often precede major market turning points.
The professional approach: use higher timeframe indicators for directional bias, lower timeframe indicators for precise entry timing.
Ask Diplyzer:
"Give me a multi-timeframe momentum analysis on [ticker]: RSI on the weekly, daily, and 4-hour charts. Is the momentum direction consistent across all three timeframes or is there divergence between them?"