--- title: "Up Volume/Down Volume Ratio: Formula" description: "Total volume in rising issues divided by total volume in falling issues, usually taken over a multi-day window such as 10 sessions to cut the noise of..." canonical: https://www.getswoopr.com/indicators/breadth/up-volume-down-volume-ratio/ source: "Swoopr Investment: https://www.getswoopr.com" --- ## Direct Answer > Total volume in rising issues divided by total volume in falling issues, usually taken over a multi-day window such as 10 sessions to cut the noise of single days. It is the smoothed form of the advance-decline volume ratio. A ratio above 1.0 means volume has been flowing mainly into rising issues over the window, and the higher it is the stronger the volume support. # Up Volume/Down Volume Ratio: Formula, Meaning, Signals, Examples and How to Use It ## How Is Up Volume/Down Volume Ratio Calculated? Total volume in rising issues divided by total volume in falling issues, usually taken over a multi-day window such as 10 sessions to cut the noise of single days. It is the smoothed form of the advance-decline volume ratio. **Formula:** `Ratio = sum of up volume over N days / sum of down volume over N days` **Inputs:** - Volume in rising issues each session - Volume in falling issues each session - Window length N, for example 10 sessions **Worked example.** If 10-day up volume totals 6,100 million shares and down volume totals 3,900 million, the ratio is 1.56. The inputs are illustrative numbers, not market data. **Reading it.** A ratio above 1.0 means volume has been flowing mainly into rising issues over the window, and the higher it is the stronger the volume support. Analysts watch the trend and compare it with price for confirmation. **Limits.** Some sources use this name for the one-day ratio, so the window matters. Volume in a few large stocks can dominate, and the ratio is undefined if down volume is zero. ## What is Up Volume/Down Volume Ratio? Total volume in rising issues divided by total volume in falling issues, usually taken over a multi-day window such as 10 sessions to cut the noise of single days. It is the smoothed form of the advance-decline volume ratio. ## How to use Up Volume/Down Volume Ratio A ratio above 1.0 means volume has been flowing mainly into rising issues over the window, and the higher it is the stronger the volume support. Analysts watch the trend and compare it with price for confirmation. A reading alone is never a buy or sell signal; it needs context from price structure, volume, volatility and the broader market regime. ## Strengths - Summing volume over N days before dividing smooths single-session outliers, so the ratio reflects the balance of a stretch of trading. - Using sums rather than an average of daily ratios keeps heavy-volume days weighted by their size, as the sums are themselves volume-based. - Reproducible when the formula and data convention are fixed. ## Weaknesses and limitations - The window is a rolling sum, so a very large day moves the ratio sharply on entry and again when it drops out N sessions later. - The ratio is not capped, so a period dominated by one-way trading can print values that are hard to chart on the same scale as ordinary periods. - 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 Up Volume/Down Volume Ratio a buy or sell signal? No. A ratio above 1.0 means volume has been flowing mainly into rising issues over the window, and the higher it is the stronger the volume support. Some sources use this name for the one-day ratio, so the window matters. 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 Up Volume/Down Volume Ratio? Up Volume/Down Volume Ratio takes these inputs: volume in rising issues each session; volume in falling issues each session; window length N, for example 10 sessions. There is no universal best setting for the tunable ones, so test them across instruments, regimes and out-of-sample periods and favor stable parameter regions over one historical winner. Can Up Volume/Down Volume Ratio be used by itself? Some sources use this name for the one-day ratio, so the window matters. Volume in a few large stocks can dominate, and the ratio is undefined if down volume is zero. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone. Does Up Volume/Down Volume Ratio work on every timeframe? The calculation (Ratio = sum of up volume over N days / sum of down volume over N days) 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 Up Volume/Down Volume Ratio give false signals? The window is a rolling sum, so a very large day moves the ratio sharply on entry and again when it drops out N sessions later. The ratio is not capped, so a period dominated by one-way trading can print values that are hard to chart on the same scale as ordinary periods. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated. How should Up Volume/Down Volume Ratio be backtested? Rebuild Up Volume/Down Volume Ratio from volume in rising issues each 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/).