What is StochRSI?
StochRSI measures how stretched a stock's momentum is, on a scale of 0 to 100. It applies the stochastic oscillator to RSI values instead of to price, so it reads the momentum of the momentum. A reading near 100 means RSI is sitting at the top of its own recent range.
StochRSI is a momentum indicator built out of another momentum indicator. That sounds like a joke at its own expense, but the second layer does something useful, and understanding what it does is most of understanding the reading.
What does StochRSI actually measure?
Start with RSI, the Relative Strength Index. RSI looks at the last 14 bars and asks how much of the total movement was upward. If a stock rose on most of those bars and fell only a little on the rest, RSI is high. If it fell on most of them, RSI is low. It comes out between 0 and 100.
RSI has a practical problem. In a strong trend it can sit between 50 and 70 for months without going anywhere interesting, and that middle range is where most of its life is spent. You can watch it for weeks and learn nothing.
StochRSI fixes that by asking a narrower question. Instead of reading RSI directly, it asks: where does today's RSI sit inside its own range over the last 14 bars? If the current RSI is the highest it has been in that window, StochRSI reads 100. If it is the lowest, StochRSI reads 0. If it is halfway, StochRSI reads 50.
So a StochRSI of 100 does not mean RSI is at 100. It means RSI is at the top of wherever RSI has been lately. That is a much more sensitive question, and it is why StochRSI reaches its extremes often while RSI rarely does.
How is StochRSI different from RSI?
| RSI | StochRSI | |
|---|---|---|
| Reads | Price | RSI |
| Hits 0 or 100 | Rarely | Often |
| Moves | Slowly | Quickly |
| Answers | Is momentum strong? | Is momentum stretched relative to itself? |
The practical consequence is that StochRSI gives you many more readings, and most of them are noise. That is the honest weakness of the indicator, and it is the reason Signal desk never acts on a StochRSI reading alone. Every rule on this site exists to filter that noise down to something worth looking at.
What are the standard StochRSI settings?
The usual setting is written 14, 14, 3, 3, and it means four
things in order:
- RSI length 14. The RSI underneath is calculated over 14 bars.
- Stochastic length 14. The range comparison looks back 14 bars.
- K smoothing 3. The raw result is averaged over 3 bars to stop it flickering. This smoothed line is called K.
- D smoothing 3. K is averaged again over 3 bars to produce a slower companion line called D.
Signal desk uses exactly these values. It also computes them the way the Pine Script reference implementation does, which matters more than it sounds: the average inside RSI is Wilder's RMA, a smoothed average that weights recent bars more heavily, and not the simple moving average that a naive implementation reaches for. Using the wrong average shifts every reading slightly, which is enough to change which stocks cross a threshold.
Is a high StochRSI a sell signal?
No, and treating it as one is the most common way people lose money with this indicator.
The word usually attached to a reading near 100 is overbought, which sounds like a warning. It is not. Overbought means momentum is at the top of its own recent range. It says nothing about whether a stock is expensive, whether the business is good, or whether the move is finished. Strong trends stay overbought for a long time, because that is what being in a strong trend looks like from the inside.
If you sell everything that reads overbought, you systematically sell your strongest positions and keep your weakest. Signal desk goes the other way and treats a maxed out reading on a slow chart as a reason to start paying attention to a stock. What it does next is covered in the pullback re-entry.
Where does the indicator come from?
StochRSI was introduced by Tushar Chande and Stanley Kroll in their 1994 book The New Technical Trader. They were explicit about the motivation: RSI spends most of its time in a middle range where it is not saying much, and applying a stochastic to it recovers resolution from that dead zone.
Common questions
What is the difference between RSI and StochRSI?
RSI measures momentum from price. StochRSI measures where the current RSI sits inside its own recent range, so it is a reading of the momentum of the momentum. That makes StochRSI move faster and hit its extremes far more often than RSI does. RSI might spend months without touching 70, while StochRSI reaches 100 and 0 regularly.
What are the standard StochRSI settings?
The common setting is 14, 14, 3, 3: an RSI length of 14, a stochastic lookback of 14, and K and D each smoothed over 3 periods. Signal desk uses exactly these, computed the way the Pine Script reference does, including Wilder's RMA for the RSI average rather than a simple moving average.
Is a StochRSI of 100 a sell signal?
No. A reading of 100 means momentum is as stretched as it has been in the last 14 periods, which on a monthly or annual chart usually means a strong trend rather than an exhausted one. Signal desk treats 100 on a high timeframe as a reason to start watching a stock, never as a reason to sell it.
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Signal desk is a public record of a mechanical screen. It is not investment advice and it is not written by a licensed financial adviser. The percentages shown are plain price changes with no positions, sizing or costs behind them, so they are not a real world return.