What is an RS rating?
An RS rating is a percentile-style score that ranks a stock's price performance against other stocks over a lookback period. A high rating means the stock has outperformed most others in that universe.
Indicator explainer
RS Rating Explained: How to Find High Relative Strength Stocks
Relative strength answers one simple question: is this stock doing better or worse than everything else? It's one of the most useful filters in momentum trading, and one of the most misunderstood, because it's so often confused with RSI.
By CA Devang Maheshwari · Updated 2 November 2026
Quick answer
Relative strength (RS) compares a stock's price performance with the market or with other stocks. An RS rating turns that into a percentile-style score, so a high rating means the stock has outperformed most other stocks over the period measured. It's different from RSI, which measures a single stock's own recent momentum on a 0 to 100 scale.
Where relative strength fits
RS works best as one filter in a top-down process.
Step 1
Market
Is the index supportive?
Step 2
Industry
Is the group strong?
Step 3
High RS
Is the stock beating most others?
Step 4
Setup
Is there a base and pivot to plan around?
High RS tells you who is leading. The setup tells you when to pay attention.
What is relative strength?
Relative strength measures a stock's performance compared with something else, usually the overall market or the rest of the stocks in a universe. It doesn't care whether the stock went up; it cares whether it went up more than others.
The RS line: stock vs market
Picture a class exam. Scoring 70 sounds average, but if most of the class scored 50, you're near the top. RS works the same way: a stock that falls 2% while the market falls 8% is showing strength.
Key idea
Relative strength is a comparison, not an absolute number. It shows which stocks buyers prefer when they have a choice.
What is an RS rating?
An RS rating converts relative performance into a percentile-style score. Stocks are ranked by price performance over a lookback period, and each stock gets a score showing where it sits in that ranking.
The idea was popularised by Investor's Business Daily (IBD) and MarketSmith, whose RS Rating runs from 1 to 99. A rating of 90 there means the stock has outperformed roughly 90% of the stocks it's compared with. Different platforms calculate their own versions with different lookbacks and weightings, so numbers aren't directly comparable across tools.
- High rating: the stock is among the stronger performers in its universe.
- Middle rating: performance roughly in line with the pack.
- Low rating: the stock is lagging most others.
RS vs RSI: not the same thing
The names are close, but they answer different questions. Mixing them up is one of the most common beginner mistakes.
| Relative strength (RS) | RSI (Relative Strength Index) | |
|---|---|---|
| Compares | A stock against the market or other stocks | A stock against its own recent price moves |
| Question it answers | Is this stock outperforming? | How strong has recent buying been? |
| Typical scale | Percentile-style rank (e.g. 1 to 99) | 0 to 100 oscillator |
| Time frame | Usually months | Usually short (often 14 periods) |
| How momentum traders use it | Higher is generally better | Often read as overbought or oversold |
A stock can have high RS and a high RSI at the same time; one doesn't confirm or cancel the other.
Why leaders show high RS early
Stocks that go on to make big moves are often outperforming well before the move becomes obvious. They hold up better during market pullbacks and recover faster when the market turns. That resilience shows up as rising relative strength.
A useful related tool is the RS line: the stock's price divided by an index, plotted as a line. When the RS line makes a new high, the stock is outperforming the market more than at any point in that period. An RS line reaching new highs while price is still in a base can be a sign of quiet strength.
Tip
Watch how stocks behave during a market dip. The ones that barely fall, or keep making higher lows, often become the leaders when the market recovers.
How to use RS with industries and setups
RS as one filter, not the whole decision
- Start with the market — Check market direction first. High RS in a falling market can still mean a falling stock, just a slower one.
- Prefer strong industries — High RS stocks inside industries with momentum have support from their peers.
- Filter for high RS — Focus on stocks ranking near the top of their universe, not the middle.
- Confirm the trend — Look for higher highs and higher lows with rising, aligned EMAs.
- Wait for a setup — Plan around a base and pivot, with a stop and position size decided in advance.
N.E.X.T shows RS as one input of its stock rating, alongside trend, industry strength and scan activity. You can read more in how the N.E.X.T stock rating works.
Common RS pitfalls
- Confusing RS with RSI. They measure different things, as the table above shows.
- Using RS alone. A high rating says nothing about whether the stock is in a good base or far extended.
- Chasing the highest number. Stocks at the very top can be extended after a huge run. Structure still matters.
- Ignoring the market. In a weak market, RS shows who is falling least, not who will rise.
- Comparing ratings across tools. Each platform uses its own formula, so a score on one isn't the same as a score on another.
Watch out
High relative strength improves the odds of a structure; it doesn't promise a move. Every trade still needs a stop.
Frequently asked questions
What is the difference between RS and RSI?
RS compares a stock with the market or other stocks. RSI is an oscillator from 0 to 100 that measures a stock's own recent momentum, and is often read as overbought or oversold.
What is a good RS rating?
Momentum traders usually focus on stocks near the top of the ranking, for example in the top 20% or so. The exact cut-off depends on the platform's formula, so treat it as a filter rather than a fixed rule.
What does an RS line new high mean?
The RS line is a stock's price divided by an index. A new high means the stock is outperforming the market more than at any point in that period, which can show quiet strength even while price is still in a base.
Who created the RS rating?
The RS Rating was popularised by Investor's Business Daily and MarketSmith, which score stocks from 1 to 99. Many platforms now calculate their own versions.
Does N.E.X.T show relative strength?
Yes. N.E.X.T uses relative strength as one input of its stock rating, alongside trend, industry strength and scan activity.
See relative strength in context
Watch the N.E.X.T walkthrough to see how RS, trend and industry strength come together in the stock rating and the three momentum scans.
Get every guide in one PDF
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Keep reading
- How to Find Momentum Stocks in NSE (Step by Step) →
- Stage 2 Stocks: How to Spot the Uptrending Stage →
- Momentum Trading in India: A Beginner's Guide →
- Breakout Trading: How Breakouts Work (and Why Many Fail) →
- How the N.E.X.T stock rating works →
- Why industry momentum leads stocks →
Written by CA Devang Maheshwari — full-time swing trader for 8 years, founder of Equialpha and builder of N.E.X.T, the swing trading platform for Indian markets. About Devang