---
title: "Minus Directional Indicator: Formula"
description: "Wilder's -DI measures downward directional movement as a share of average true range. It rises when lows are being extended downward faster than highs are..."
canonical: https://www.getswoopr.com/indicators/trend/minus-directional-indicator/
source: "Swoopr Investment: https://www.getswoopr.com"
---

## Direct Answer



> Minus Directional Indicator is a trend measure used to describe trend direction, persistence, strength, or a smoothed price reference. The production page must define the exact calculation convention before interpreting higher or lower readings, because platform and provider implementations can differ.





      


# Minus Directional Indicator: Formula, Meaning, Signals, Examples and How to Use It



## How Is Minus Directional Indicator Calculated?

Wilder's -DI measures downward directional movement as a share of average true range. It rises when lows are being extended downward faster than highs are being extended upward.

**Formula:** `-DI = 100 * Smoothed(-DM, n) / ATR(n), where -DM = prior Low - Low when that downward move exceeds the upward move and is above 0`

**Inputs:**

- High, low and close prices
- Smoothing period n (14 is Wilder's default)
- Smoothed minus directional movement
- Average true range

**Worked example.** A smoothed minus directional movement of 1.2 over an ATR of 4.0 gives a -DI of 30.0%. The inputs are illustrative numbers, not market data.

**Reading it.** A higher -DI means downward movement is a larger share of the true range. It is usually compared with +DI: -DI above +DI indicates downward movement dominates. The line is not a trend strength measure by itself.

**Limits.** The -DI and +DI lines cross often in sideways markets, producing false signals. Comparing it alone, without ADX for strength, can mislead.


      

## Indicator overview





| Attribute | Value |
| --- | --- |
| Category | Trend |
| Asset classes | Stocks, ETFs, Indexes, Futures, Forex, Crypto, Commodities |
| Output type | Line/scalar |
| Parameters | Varies by implementation; document exact settings on use |






## What is Minus Directional Indicator?



Minus Directional Indicator is a trend measure used to describe trend direction, persistence, strength, or a smoothed price reference. 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?



Minus Directional Indicator measures specific market properties in the Trend 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 Minus Directional Indicator



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



- It reports only downward directional pressure, so a single line answers how strongly lows are being extended.
- Division by ATR scales the reading to recent range, so values are comparable across instruments with different price levels.
- Reproducible when the formula and data convention are fixed.




## Weaknesses and limitations



- The reading is a share of range, so in a very quiet stretch the line can be high on small absolute downward moves.
- It rises on any downward drift, including slow ones, so it does not separate a sharp decline from a gradual slide on its own.
- 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 Minus Directional Indicator a buy or sell signal?




No. A higher -DI means downward movement is a larger share of the true range. The -DI and +DI lines cross often in sideways markets, producing false signals. 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 Minus Directional Indicator?




Minus Directional Indicator takes these inputs: high, low and close prices; smoothing period n (14 is Wilder's default); smoothed minus directional movement. 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 Minus Directional Indicator be used by itself?




The -DI and +DI lines cross often in sideways markets, producing false signals. Comparing it alone, without ADX for strength, can mislead. For that reason it is read next to measures of direction, participation, valuation, liquidity and risk, not alone.










Does Minus Directional Indicator work on every timeframe?




The calculation (-DI = 100 * Smoothed(-DM, n) / ATR(n), where -DM = prior Low - Low when that downward move exceeds the upward move and is above 0) 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 Minus Directional Indicator give false signals?




The reading is a share of range, so in a very quiet stretch the line can be high on small absolute downward moves. It rises on any downward drift, including slow ones, so it does not separate a sharp decline from a gradual slide on its own. Lag, noise and regime changes add to this, because market participants react to new information after the reading is calculated.










How should Minus Directional Indicator be backtested?




Rebuild Minus Directional Indicator from high, low and close prices 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/).