--- title: "Advance/Decline Volume Ratio: Formula" description: "Total volume in advancing issues divided by total volume in declining issues for a session. It weights breadth by trading activity, so it shows where the..." canonical: https://www.getswoopr.com/indicators/breadth/advance-decline-volume-ratio/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer > Total volume in advancing issues divided by total volume in declining issues for a session. It weights breadth by trading activity, so it shows where the volume went rather than only how many stocks rose. A ratio above 1.0 means more volume traded in advancing issues than in declining ones, and the higher it is the more one-sided the session. # Advance/Decline Volume Ratio: Formula, Meaning, Signals, Examples and How to Use It ## How Is Advance/Decline Volume Ratio Calculated? Total volume in advancing issues divided by total volume in declining issues for a session. It weights breadth by trading activity, so it shows where the volume went rather than only how many stocks rose. **Formula:** `Ratio = advancing volume / declining volume` **Inputs:** - Volume in advancing issues for the session - Volume in declining issues for the session **Worked example.** With 720 million shares of advancing volume and 480 million of declining volume, the ratio is 1.50. The inputs are illustrative numbers, not market data. **Reading it.** A ratio above 1.0 means more volume traded in advancing issues than in declining ones, and the higher it is the more one-sided the session. Very high readings on a single day are commonly studied as signs of strong buying pressure, and very low readings as heavy selling. **Limits.** It is an unbounded ratio and is undefined when declining volume is zero. It ignores the unchanged group and can be dominated by a handful of high-volume stocks. ## What is Advance/Decline Volume Ratio? Total volume in advancing issues divided by total volume in declining issues for a session. It weights breadth by trading activity, so it shows where the volume went rather than only how many stocks rose. ## How to use Advance/Decline Volume Ratio A ratio above 1.0 means more volume traded in advancing issues than in declining ones, and the higher it is the more one-sided the session. Very high readings on a single day are commonly studied as signs of strong buying pressure, and very low readings as heavy selling. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime. ## Strengths - A single division of two exchange-reported volume totals, so it is easy to compute and verify from a daily market summary. - Values above 1 mean more share volume traded in rising issues than in falling ones, which gives a clear midpoint to read from. - Reproducible when the formula and data convention are fixed. ## Weaknesses and limitations - Because the ratio is not bounded, one lopsided session can print a figure many times larger than ordinary days and distort any average built from it. - The ratio treats every session alike whether total volume was heavy or light, so a 3.0 on a thin half-day equals a 3.0 on a record-volume day. - 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 Advance/Decline Volume Ratio a buy or sell signal? No. A ratio above 1.0 means more volume traded in advancing issues than in declining ones, and the higher it is the more one-sided the session. It is an unbounded ratio and is undefined when declining volume is zero. 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 Advance/Decline Volume Ratio? Advance/Decline Volume Ratio is computed from volume in advancing issues for the session; volume in declining issues 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 Advance/Decline Volume Ratio be used by itself? It is an unbounded ratio and is undefined when declining volume is zero. It ignores the unchanged group and can be dominated by a handful of high-volume stocks. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone. Does Advance/Decline Volume Ratio work on every timeframe? The calculation (Ratio = advancing volume / declining 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 Advance/Decline Volume Ratio give false signals? Because the ratio is not bounded, one lopsided session can print a figure many times larger than ordinary days and distort any average built from it. The ratio treats every session alike whether total volume was heavy or light, so a 3.0 on a thin half-day equals a 3.0 on a record-volume day. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated. How should Advance/Decline Volume Ratio be backtested? Rebuild Advance/Decline Volume Ratio from volume in advancing issues 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. S Swoopr Editorial Team The Swoopr Editorial Team produces independent investment education, research, and tools for understanding markets, evaluating opportunities, and managing risk. All content is educational only and does not constitute personalized investment advice. See our [editorial policy](https://www.getswoopr.com/legal/editorial-policy/) and [corrections policy](https://www.getswoopr.com/legal/corrections-policy/).