Direct Answer
Support/resistance strength is a heuristic score for how significant a horizontal price level looks, usually based on how many times price has reacted at it, how recently, and how much volume traded there. There is no single standard formula. More touches over a longer span, with larger volume, are usually read as a more established level.
Support/Resistance Strength: Formula, Meaning, Signals, Examples and How to Use It
How Is Support/Resistance Strength Calculated?
Support/resistance strength is a heuristic score for how significant a horizontal price level looks, usually based on how many times price has reacted at it, how recently, and how much volume traded there. There is no single standard formula.
Formula: No standard formula. A common construction: strength = number of touches (reversals within a tolerance band around the level), optionally weighted by recency or volume
Inputs:
- Candidate price level
- Tolerance band around the level
- Price history
- Optional volume and recency weights
Reading it. More touches over a longer span, with larger volume, are usually read as a more established level. A score is useful for ranking levels within one method on one chart, not for comparing across methods.
Limits. The score depends entirely on the tolerance band and counting rules, so different tools give different values for the same chart. Past reactions do not guarantee the level will hold, and each failure of a level is also an observation.
What is Support/Resistance Strength?
Support/resistance strength is a heuristic score for how significant a horizontal price level looks, usually based on how many times price has reacted at it, how recently, and how much volume traded there. There is no single standard formula.
How to use Support/Resistance Strength
More touches over a longer span, with larger volume, are usually read as a more established level. A score is useful for ranking levels within one method on one chart, not for comparing across methods. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime.
Strengths
- Counting touches within a tolerance band turns a subjective judgment about a chart level into a number recomputed from stated rules.
- Optional weights for recency and volume let the score reflect when and how heavily a level was visited, not just how often.
- Reproducible when the formula and data convention are fixed.
Weaknesses and limitations
- Touches clustered in a single episode can be counted as many, so counting bars rather than separate reversals inflates the score.
- Because the score is a count it keeps rising for a level that no longer matters, unless age weights are added.
- 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.
Frequently Asked Questions
Is Support/Resistance Strength a buy or sell signal?
No. More touches over a longer span, with larger volume, are usually read as a more established level. The score depends entirely on the tolerance band and counting rules, so different tools give different values for the same chart. 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 Support/Resistance Strength?
Support/Resistance Strength is computed from candidate price level; tolerance band around the level; price history, 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 Support/Resistance Strength be used by itself?
The score depends entirely on the tolerance band and counting rules, so different tools give different values for the same chart. Past reactions do not guarantee the level will hold, and each failure of a level is also an observation. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone.
Does Support/Resistance Strength work on every timeframe?
The calculation (No standard formula. A common construction: strength = number of touches (reversals within a tolerance band around the level), optionally weighted by recency or volume) 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 Support/Resistance Strength give false signals?
Touches clustered in a single episode can be counted as many, so counting bars rather than separate reversals inflates the score. Because the score is a count it keeps rising for a level that no longer matters, unless age weights are added. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated.
How should Support/Resistance Strength be backtested?
Rebuild Support/Resistance Strength from candidate price level 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.