Open any charting platform and you can add two hundred indicators. Almost all of them are transformations of the same four inputs: open, high, low, close — plus volume.
No indicator contains information that is not already in the price. What they do is reorganise that information so certain patterns become easier to see. That is genuinely useful, and it is also the ceiling on what they can do.
What momentum actually measures
Momentum indicators measure the rate of change of price, not price itself. They answer: is this move accelerating or decelerating?
That is a real and useful question, and it is a different question from "which way is price going".
The three that matter
RSI compares the size of recent gains to recent losses, scaled 0–100. Above 70 is conventionally "overbought", below 30 "oversold".
MACD is the difference between two exponential averages, with a signal line on top. It measures whether short-term momentum is pulling away from longer-term.
Stochastics measures where the close sits within the recent high-low range. Near the top means closing strong.
They correlate heavily. Adding all three does not triple your information — it mostly triples your confidence in a single reading, which is worse than having one.
The overbought trap
This is the expensive one, so it is worth being blunt.
"Overbought" does not mean "about to fall". It means price has risen strongly and quickly.
In a strong uptrend, RSI can sit above 70 for weeks. Every day it stays there, someone shorts it because the indicator says overbought, and every day the trend continues. The indicator is not broken — it is correctly reporting strong upward momentum, which is a reason to respect the trend, not fade it.
The reliable framing:
- In a range, overbought and oversold readings work reasonably as mean-reversion signals.
- In a trend, they mark strength, and fading them is fighting the dominant force.
Which means you must identify the regime before the indicator reading means anything. An RSI of 78 has two opposite interpretations depending on context, and the indicator cannot tell you which applies.
Divergence, and its honest track record
Divergence is when price makes a new high but the indicator does not, suggesting the move is losing force.
It is the most useful thing momentum indicators produce, and it still needs care:
It can persist a long time. Divergence appearing does not mean a reversal is close. Trends routinely diverge for weeks before turning, and many divergences simply resolve by the indicator catching up.
It is clearer in hindsight. On a historical chart divergences are obvious. In real time you are looking at a possible peak that has not formed yet.
It is a warning, not a trigger. Reasonable use: reduce size, tighten stops, stop adding. Unreasonable use: reverse your position because a line diverged.
Settings, and why tuning them is a trap
Default periods — RSI 14, MACD 12/26/9 — are conventions, not optimised values.
Changing them changes sensitivity, not accuracy. A shorter RSI gives more signals, more of them false. A longer one gives fewer, later.
Traders who backtest to find the "best" settings for the last six months are fitting to noise. The settings that performed best recently are the ones most likely to disappoint next, because they encode the specific character of a period that is over.
What to use them for
Confirming what structure already told you. Structure says uptrend, momentum says accelerating — those agree, and confidence is reasonable.
Spotting deceleration. The genuine strength of the tool. Momentum fading before structure breaks is an early, useful warning.
Comparing across time. Is the current push stronger or weaker than the last one? Answers a question price alone makes hard.
Not for entries on their own. An indicator crossing a threshold is not a reason to trade. It is a reason to look at the chart more carefully.
Check yourself
0 of 4 answered1.RSI has been above 70 for three weeks in a strong uptrend. What does this most likely indicate?
2.Why does adding RSI, MACD and stochastics together provide less than it appears?
3.You spot bearish divergence on a daily chart. What is the appropriate response?
4.Why is backtesting to find optimal RSI settings usually counterproductive?
What to take away
- Indicators reorganise price information. They add none.
- Momentum measures rate of change, not direction.
- RSI, MACD and stochastics correlate heavily — one is enough.
- Overbought ≠ about to fall. In a trend it marks strength.
- Identify the regime first; the same reading has opposite meanings.
- Divergence is a warning, not a trigger.
- Tuning settings fits to noise. Defaults are fine.