Direct Answer
New High/New Low Ratio is a breadth measure used to measure how widely a market move is being participated in across constituents. The production page must define the exact calculation convention before interpreting higher or lower readings, because platform and provider implementations can differ.
New High/New Low Ratio: Formula, Meaning, Signals, Examples and How to Use It
How Is New High/New Low Ratio Calculated?
The number of new highs divided by the number of new lows in a session. It expresses the balance of leadership as a multiple instead of a difference.
Formula: Ratio = new highs / new lows
Inputs:
- New 52-week highs for the session
- New 52-week lows for the session
Worked example. With 120 new highs and 40 new lows, the ratio is 3.00. The inputs are illustrative numbers, not market data.
Reading it. A ratio above 1.0 means new highs outnumber new lows, and the higher it is the stronger the leadership. Values below 1.0 show that lows dominate.
Limits. It is undefined when there are no new lows and can swing wildly when the counts are small. Like other ratios, it is asymmetric around 1.0.
Indicator overview
| Attribute | Value |
|---|---|
| Category | Breadth |
| Asset classes | Indexes, Equity markets, Sectors, Industries |
| Output type | Ratio/index/scalar |
| Parameters | Varies by implementation; document exact settings on use |
What is New High/New Low Ratio?
New High/New Low Ratio is a breadth measure used to measure how widely a market move is being participated in across constituents. The production page must define the exact calculation convention before interpreting higher or lower readings, because platform and provider implementations can differ.
For Swoopr, the canonical profile separates definition, calculation, interpretation and decision use. That keeps readers from collapsing a descriptive metric into a trading strategy. An indicator can describe trend, momentum, volatility, participation, positioning or risk without providing a complete entry, exit, sizing or portfolio decision.
What does it measure?
New High/New Low Ratio measures specific market properties in the Breadth domain. The practical value is repeatability: the same inputs and formula can be applied across a defined dataset, allowing users to compare readings through time or across instruments when the calculation convention is held constant.
How to read New High/New Low Ratio
Interpretation depends on the market property being measured. A descriptive reading is not automatically predictive. The same numerical state can lead to different outcomes in a strong trend, quiet range, event-driven gap or illiquid market. Always combine with context from price structure, volume, and broader market regime before drawing conclusions.
Strengths
- Dividing highs by lows keeps the answer scale-free, so a reading of 4.0 means four highs per low whatever the number of issues.
- A ratio of 1.0 marks an exact balance between the two groups, giving an easy midpoint for reading shifts in leadership.
- Reproducible when the formula and data convention are fixed.
Weaknesses and limitations
- A session with 400 highs and 100 lows and one with 4 highs and 1 low print the same value, so the ratio loses the scale of the event.
- Averaging daily ratios over a period overweights days with few lows, because a small denominator magnifies the quotient.
- Correlated indicators can create false confidence by repeating the same underlying information.
Editorial and risk note
This page is educational content, not individualized investment advice. It should not imply guaranteed prediction, accuracy or outperformance. Where multiple valid definitions exist, Swoopr states the alternatives and the reason for selecting its primary convention.
Frequently Asked Questions
Is New High/New Low Ratio a buy or sell signal?
No. A ratio above 1.0 means new highs outnumber new lows, and the higher it is the stronger the leadership. It is undefined when there are no new lows and can swing wildly when the counts are small. A trade built on it still needs a trigger, an invalidation rule, a position size and realistic execution assumptions.
What is the best setting for New High/New Low Ratio?
New High/New Low Ratio is computed from new 52-week highs for the session; new 52-week lows for the session, so the choices that matter are the data convention and the window it is read over. Test those across instruments, regimes and out-of-sample periods instead of fitting one historical winner.
Can New High/New Low Ratio be used by itself?
It is undefined when there are no new lows and can swing wildly when the counts are small. Like other ratios, it is asymmetric around 1.0. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone.
Does New High/New Low Ratio work on every timeframe?
The calculation (Ratio = new highs / new lows) can be run on any bar size, but behavior is not portable: a reading on a five-minute chart describes a very different market window from the same reading on a daily chart. Validate the exact timeframe before relying on it.
Why does New High/New Low Ratio give false signals?
A session with 400 highs and 100 lows and one with 4 highs and 1 low print the same value, so the ratio loses the scale of the event. Averaging daily ratios over a period overweights days with few lows, because a small denominator magnifies the quotient. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated.
How should New High/New Low Ratio be backtested?
Rebuild New High/New Low Ratio from new 52-week highs for the session using point-in-time data, write the rules before testing, include delisted securities where relevant, model realistic fills and costs, reserve a validation sample and compare with a simpler baseline.