--- title: "Declining Volume Percentage: Formula" description: "The share of combined advancing and declining volume that traded in declining issues. It is the mirror of advancing volume percentage and measures how much..." canonical: https://www.getswoopr.com/indicators/breadth/declining-volume-percentage/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer > The share of combined advancing and declining volume that traded in declining issues. It is the mirror of advancing volume percentage and measures how much of the session's volume was on the selling side of the market. Values above 50 percent mean most volume was in falling issues, and readings far above 50 show heavy selling participation. # Declining Volume Percentage: Formula, Meaning, Signals, Examples and How to Use It ## How Is Declining Volume Percentage Calculated? The share of combined advancing and declining volume that traded in declining issues. It is the mirror of advancing volume percentage and measures how much of the session's volume was on the selling side of the market. **Formula:** `Declining volume % = declining volume / (advancing volume + declining volume) x 100` **Inputs:** - Volume in declining issues - Volume in advancing issues **Worked example.** With 720 million shares of advancing volume and 480 million of declining volume, declining issues account for 40.0% of that volume. The inputs are illustrative numbers, not market data. **Reading it.** Values above 50 percent mean most volume was in falling issues, and readings far above 50 show heavy selling participation. Analysts watch for extreme days and for how the figure behaves when price is rising. **Limits.** When unchanged volume is excluded, this reading is just 100 minus the advancing volume percentage, so it adds no new information beyond that figure. Other providers use total volume as the denominator. ## What is Declining Volume Percentage? The share of combined advancing and declining volume that traded in declining issues. It is the mirror of advancing volume percentage and measures how much of the session's volume was on the selling side of the market. ## How to use Declining Volume Percentage Values above 50 percent mean most volume was in falling issues, and readings far above 50 show heavy selling participation. Analysts watch for extreme days and for how the figure behaves when price is rising. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime. ## Strengths - It restates volume pressure from the downside, which is convenient when a screen or chart is built around readings of heavy down-volume days. - Its fixed 0 to 100 scale lets days with very different total volume be placed on one chart without rescaling. - Reproducible when the formula and data convention are fixed. ## Weaknesses and limitations - A high reading can come from a thin session where a few down-trades outweighed little else, so the percentage does not distinguish panic from quiet drift. - Every share sold in a falling issue is also bought, so the figure labels the issue's direction and does not measure selling pressure itself. - 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 Declining Volume Percentage a buy or sell signal? No. Values above 50 percent mean most volume was in falling issues, and readings far above 50 show heavy selling participation. When unchanged volume is excluded, this reading is just 100 minus the advancing volume percentage, so it adds no new information beyond that figure. 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 Declining Volume Percentage? Declining Volume Percentage is computed from volume in declining issues; volume in advancing issues, 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 Declining Volume Percentage be used by itself? When unchanged volume is excluded, this reading is just 100 minus the advancing volume percentage, so it adds no new information beyond that figure. Other providers use total volume as the denominator. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone. Does Declining Volume Percentage work on every timeframe? The calculation (Declining volume % = declining volume / (advancing volume + declining volume) x 100) 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 Declining Volume Percentage give false signals? A high reading can come from a thin session where a few down-trades outweighed little else, so the percentage does not distinguish panic from quiet drift. Every share sold in a falling issue is also bought, so the figure labels the issue's direction and does not measure selling pressure itself. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated. How should Declining Volume Percentage be backtested? Rebuild Declining Volume Percentage from volume in declining issues 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/).