Trend strengthLagging trend-direction and strength indicatorVI

Vortex Indicator VI

Two crossing lines, inspired by water vortices, that capture the start and direction of a trend.

Quick answer: The Vortex Indicator uses two oscillating lines — VI+ and VI− — built from the relationship between highs and lows across bars, to identify the start of a new trend and its direction through their crossovers.

In simple words

The Vortex Indicator was inspired by the way water swirls in opposite directions in a vortex. It builds two lines: VI+ measures upward trend movement and VI− measures downward. When VI+ is above VI−, the trend is up; when VI− is above VI+, it is down. The crossover of the two lines is designed to catch a new trend early, and how far the lines spread apart shows how strong that trend is. It is a relatively modern tool, conceptually related to Wilder's Directional Movement but calculated differently.

Vortex Indicator — visual

How Vortex Indicator looks on a chart

VI+ (positive trend movement) and VI− (negative trend movement) oscillate and cross. VI+ above VI− signals an uptrend, VI− above VI+ a downtrend; the crossover marks the trend change and the spread its strength.

Professional explanation

The vortex logic

Botes and Siepman drew on the idea of vortices — the swirling motion where flow moves in opposite directions. In markets, they measured 'vortex movement' as the distance between the current high and the prior low (upward vortex) and the current low and the prior high (downward vortex). Summing these over a look-back and dividing by the True Range gives VI+ and VI−. The mechanic captures the tug-of-war between buyers and sellers across consecutive bars.

Crossovers signal trend changes

The primary signal is the crossover. When VI+ crosses above VI−, upward movement has overtaken downward — a bullish trend change, often near the start of a new up-move. VI− crossing above VI+ is the bearish equivalent. The designers built the indicator specifically to identify the beginning of a trend, so the crossover is meant as an entry cue rather than a mid-trend confirmation.

The spread as strength

As with the DMI, the distance between VI+ and VI− grades strength. A wide, widening spread means one side is decisively in control — a strong trend. When the two lines converge and weave around 1.0 (the level around which they oscillate), the market is directionless and crossovers become unreliable. The magnitude of the dominant line above 1 signals conviction.

Vortex vs the Directional Movement system

The Vortex Indicator is often compared to Wilder's +DI/−DI because both use two crossing directional lines built on True Range. The difference is in construction: Vortex uses the raw distance between current and prior highs and lows, giving it a slightly different, sometimes earlier, response to trend changes. Being newer and less universal, it is often used to complement rather than replace the DMI, and benefits from an ADX or momentum filter to cut whipsaws.

Formula

Vortex Indicator formula

VI+ = Σ|Highₜ − Lowₜ₋₁| / ΣTR; VI− = Σ|Lowₜ − Highₜ₋₁| / ΣTR

Sums run over N periods (default 14). TR is the True Range. VI+ and VI− oscillate around 1.0; the line above 1 indicates the dominant trend direction.

VI+ — Positive vortex line — sum of |current high − prior low| over N, divided by summed True Range
VI− — Negative vortex line — sum of |current low − prior high| over N, divided by summed True Range
TR — True Range — the greatest of the current high-low, high-prior close, and low-prior close distances
N — Look-back period, default 14 bars

How it is calculated

For each bar, compute the positive vortex movement |current high − prior low| and the negative vortex movement |current low − prior high|.
Compute the True Range for each bar.
Sum the positive vortex movements, the negative vortex movements and the True Ranges over N periods (default 14).
Compute VI+ = summed positive vortex movement / summed True Range, and VI− = summed negative vortex movement / summed True Range.
Read VI+ above VI− as an uptrend and VI− above VI+ as a downtrend; watch for crossovers and the spread between the lines.

Interpretation & signals

Traders read the Vortex Indicator for trend direction and change: VI+ above VI− is an uptrend, VI− above VI+ a downtrend, the crossover flags the trend change, and the spread between the lines grades strength.

Buy / bullish signals

VI+ crosses above VI−, signalling a new uptrend is beginning.
VI+ pulls decisively above 1 while VI− falls below it, confirming upward control.
The VI+/VI− spread widens with VI+ on top, showing the uptrend is strengthening.
VI+ crossover confirmed by a rising ADX or supportive price structure.

Sell / bearish signals

VI− crosses above VI+, signalling a new downtrend is beginning.
VI− pulls decisively above 1 while VI+ falls below it, confirming downward control.
The spread widens with VI− on top, showing the downtrend is strengthening.
VI− crossover confirmed by a rising ADX or a break of support.

False signals to beware

When VI+ and VI− weave around 1.0, crossovers whipsaw in the absence of a real trend.
In choppy markets the lines cross repeatedly with narrow spreads and little follow-through.
A crossover without confirmation can trigger early on a single volatile bar.

Settings, timeframe & conditions

Best settings

14 periods (Botes & Siepman default)

Avoid

Trading every crossover in a range without a strength or trend filter

Works best in

Markets beginning clear new trends

Struggles in

Sideways, low-volatility chop where the lines tangle around 1

Advantages & limitations

Advantages

Designed specifically to catch the start of a new trend via crossovers.
Gives both direction and strength from two intuitive lines.
Can respond slightly earlier to trend changes than some older directional tools.
Simple crossover logic that is easy to automate and combine with filters.

Limitations & disadvantages

Whipsaws in ranges when the lines tangle around 1.0.
Relatively new and less widely supported than ADX or moving averages.
Crossovers need confirmation to avoid false starts.
Provides no fixed overbought/oversold levels.

Combining Vortex Indicator with other indicators

Average Directional Index — The Vortex crossover gives direction and timing while ADX confirms the trend is strong enough to trade, filtering out the range-bound whipsaws.
Directional Movement Index — Vortex and the DMI are cousins; agreement between a VI crossover and a DI crossover strengthens the directional read.
Average True Range — ATR, which underpins the Vortex calculation via True Range, also sizes stops for Vortex-based trend entries.

Practical examples (Nifty & Bank Nifty)

NIFTY example

Nifty has been sliding with VI− above VI+. As it bottoms and turns, VI+ rises and crosses above VI− while the spread begins to widen. That VI+ crossover, appearing near the start of the turn, is the Vortex Indicator's core bullish signal — it is designed to catch a trend's birth. A trader confirms it with a rising ADX before committing, since a crossover alone can be an early false start in Nifty's choppy phases.

BANKNIFTY example

Bank Nifty is range-bound and its VI+ and VI− lines weave tightly around 1.0, crossing each other three times in a few sessions with barely any spread. A trader who takes each crossover is whipsawed. The lesson is that Vortex crossovers only matter when the lines separate meaningfully — the tight tangle around 1 is telling the trader there is no trend yet, so the signals should be filtered by ADX or ignored until a clean, widening crossover appears.

Common mistakes

Trading Vortex crossovers in a range where the lines tangle around 1.0.
Ignoring the spread — a crossover with no separation rarely holds.
Using it without a strength or trend filter to confirm crossovers.
Expecting fixed overbought/oversold levels, which the Vortex does not have.

Professional usage

Professionals use the Vortex Indicator primarily as a trend-onset detector. Because it is built to flag the beginning of a trend through the VI+/VI− crossover, they watch for a clean cross accompanied by a widening spread, then confirm with a strength filter such as ADX or with price structure before acting. As a newer and less universal tool, it is most often used to complement Wilder's Directional Movement system rather than replace it, with the crossover treated as a directional input inside a broader trend framework.

Key takeaway

The Vortex Indicator plots two crossing lines, VI+ and VI−, inspired by swirling water, to catch the start and direction of a trend: VI+ above VI− is up, VI− above VI+ is down, and the crossover flags the change. It shines at the birth of trends but whipsaws in ranges when the lines tangle around 1 — so confirm crossovers with a strength filter and watch that the spread actually widens.

Frequently asked questions

What is the Vortex Indicator?

The Vortex Indicator, created by Etienne Botes and Douglas Siepman in 2010, uses two oscillating lines, VI+ and VI−, built from the relationship between highs and lows across bars, to identify the start and direction of a trend through their crossovers.

What do VI+ and VI− mean?

VI+ measures positive (upward) trend movement and VI− measures negative (downward) trend movement. When VI+ is above VI−, the trend is up; when VI− is above VI+, the trend is down. Their crossover signals a change in trend direction.

What are the best Vortex settings?

The standard is 14 periods, as its designers specified. Shorter look-backs make the lines more reactive and prone to whipsaws; longer look-backs smooth them for positional trend detection.

What is a Vortex crossover?

A Vortex crossover is when VI+ and VI− cross. VI+ crossing above VI− is a bullish signal that a new uptrend may be starting; VI− crossing above VI+ is bearish. The indicator was designed specifically to catch these trend-change points.

How is the Vortex Indicator different from the DMI?

Both use two crossing directional lines built on True Range, but they are calculated differently: the Vortex uses the raw distance between current and prior highs and lows, while the DMI uses Wilder's directional movement. The Vortex can sometimes respond a little earlier to trend changes.

Is the Vortex Indicator leading or lagging?

It is technically a lagging indicator, but it is designed to identify trends near their start, so its crossovers can give a relatively early read on a trend change compared with some slower directional tools.

What does it mean when the Vortex lines are near 1?

The VI+ and VI− lines oscillate around 1.0. When both hover near 1 and weave together, the market is directionless, and crossovers in that state are unreliable. A meaningful signal requires the lines to separate clearly.

How do you trade with the Vortex Indicator?

The common approach is to go long when VI+ crosses above VI− and short when VI− crosses above VI+, ideally confirmed by a widening spread and a strength filter like ADX, and to avoid crossovers that occur while the lines are tangled around 1.

Does the Vortex Indicator work in a range?

Poorly on its own. In a range VI+ and VI− weave around 1.0 and cross repeatedly, producing whipsaws. The Vortex is designed for trending markets and works best when filtered by a trend-strength indicator.

Can the Vortex Indicator be used for Nifty and Bank Nifty?

Yes. It works on any liquid instrument. On Nifty and Bank Nifty it is useful for spotting the start of new trends, but because both can be choppy, confirming crossovers with ADX or price structure helps avoid false starts.

What does the spread between the Vortex lines show?

The distance between VI+ and VI− grades the strength of the trend. A wide, widening spread means one side decisively controls the market; a narrow spread with the lines close together means the trend is weak or absent.

Is the Vortex Indicator reliable?

It can reliably flag trend changes when its crossovers are accompanied by a widening spread and confirmed by other tools, but on its own it whipsaws in ranging markets, so it is best used within a broader trend framework rather than as a standalone trigger.

Voice search & related questions

Natural-language questions people ask about Vortex Indicator.

What is the Vortex Indicator in simple words?

It plots two lines inspired by swirling water: a positive line for upward movement and a negative line for downward. When the positive line is on top, the trend is up; when the negative line is on top, the trend is down.

Is a Vortex crossover a buy signal?

VI+ crossing above VI− can be a buy signal that a new uptrend is starting, but it is more reliable when the lines then separate clearly and a strength tool like ADX confirms the trend.

What is the difference between the Vortex Indicator and ADX?

The Vortex gives trend direction through its two crossing lines, while ADX measures only trend strength without direction. Many traders use the Vortex for direction and ADX to confirm the trend is strong enough.

Is the Vortex Indicator good for day trading?

It can work intraday for spotting the start of trends, but it whipsaws in choppy conditions, so day traders confirm its crossovers with a trend-strength filter or price action.

Which Vortex line is bullish?

The VI+ line is the bullish one. When VI+ is above VI−, upward movement dominates and the trend bias is up; when VI− is above VI+, the bias is down.

Sources & references

Last reviewed 8 July 2026. Educational content only — not investment advice.