RSI and MACD are the two most-watched momentum indicators, and they're often treated as two votes for the same thing. They aren't. They measure momentum from different angles — and the real information shows up in how they relate, not in either one alone.
RSI: how stretched is the move?
The Relative Strength Index compares the size of recent up-moves to down-moves and scales it 0–100. It's bounded, so it's good at answering how one-sided, how stretched recent action has been. (We go deep on this in how to actually read RSI — including why the 70/30 rule misleads.)
MACD: is momentum shifting?
MACD — Moving Average Convergence Divergence — is the gap between two exponential moving averages (typically 12- and 26-day), with a 9-day "signal line" on top and a histogram showing the distance between them. Unlike RSI it's unbounded, and it's built to answer a different question: is momentum accelerating or fading, and has its direction just turned? The classic event is a crossover — the MACD line crossing its signal line — which flags a shift in momentum.
RSI measures how far the move has gone. MACD measures whether the move is speeding up or turning. Different questions.
When they agree — and when they don't
When both point the same way — RSI firm and rising while MACD is above its signal line with a positive histogram — they're corroborating a healthy, ongoing move. That agreement is reassuring but rarely surprising.
The interesting moments are disagreements. RSI can read "stretched" high in a trend while MACD's histogram is already shrinking — momentum fading beneath a still-high reading. Or price makes a new high while MACD makes a lower one (a divergence), a caution that the two most useful indicators here quietly disagree. Neither is a buy or sell trigger; both are prompts to look closer.
Here the two agree: RSI at 61.4 shows firm-but-not-stretched momentum, and MACD sitting above its signal line with a positive histogram (+0.58) says that momentum is still building rather than fading. No divergence to flag — the two views corroborate an intact upward move.
Educational commentary — not adviceRSI, MACD, signal and histogram are all computed from price; the read's job is to say whether they're telling the same story. (Example reading — a point-in-time snapshot, not current data.)
Takeaways
- RSI is bounded (0–100) — it measures how stretched a move is.
- MACD is unbounded — it measures whether momentum is accelerating or turning (crossovers).
- Agreement corroborates a move; divergence is the more informative signal.
- Neither is a trigger on its own — read them together, inside the trend.
See RSI and MACD side by side
Pull up any ticker for RSI, MACD and the full indicator grid — computed exactly and read together, in context.
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