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Trading Forex is not just about price.

That is not to say that price isn't important...

...but there are other elements to consider when planning a trade.

For example, do the various characteristics of the FX pair in question suit your trading style?

A key characteristic you should consider is volatility.

Now, what exactly is volatility?

Volatility is a way of quantifying price variability...

...which is a fancy way of saying that volatility measures the rate at which a market moves.

A volatile market is one that exhibits rapid fluctuations in price.

A non-volatile or stable market has moderate price fluctuations.

These conditions can be in a state of flux themselves, of course.

There is nothing to say that a quiet market has to remain that way.

To complicate matters a little further, when people in the market talk about volatility...

...they may be talking about slightly different things.

Despite this, our general description of volatility – the rate at which a market moves – holds true.

That said, these are the various ways people may interpret volatility:

- historical volatility – calculated from actual price changes
- future volatility – the unknown rate at which a market will move going forward
- forecast volatility – an estimate of future volatility
- implied volatility – a term used in the options market.

The pricing of options is a huge subject and we won't go into it beyond the barest detail here.

The value of an option is influenced by the volatility of a market.

Theoretical models using forecast volatilities often produce results that differ from actual traded options prices.

Using the price of an option in the market, you can work backwards to calculate an implied volatility.

The reason I bring up options, is this:

...a widely quoted measure of market volatility, the CBOE's Volatility Index, or VIX, uses volatilities implied by options prices as it foundation.

The VIX is a guide to the stock market.

If you are looking for a Forex volatility index, there are also currency-related indices available.

Having introduced these specific types of volatility, let's now try and simplify things.

So here's the good news:

...we are only really concerned with the first type of volatility on the list.

That is because when we talk about volatility in terms of economic indicators, we are referring to historical volatility.

We calculate this from actual price movements that have already occurred.

What's the benefit of this to you?

A volatility indicator helps you gauge the state of a market and in a general sense judge whether it suits your needs.

You see, if you're the kind of trader looking for a steady, quiet ride, a low-volatility market may suit you better.

On the other hand:

...if your trading is short-term or you trade in a counter-trending style, you probably want a bit of price chop.

In this scenario, you might actively seek more volatile markets.

Going beyond this usage of determining a market's suitability, volatility indicators also have more specific uses.

The various uses include:

- judging whether the market is about to reverse
- gauging the strength of a trend
- identifying possible breakouts from a range-bound market.

But that's just part of the story.

Not all forex volatility indicators do all these things.

In fact, different indicators measure volatility in different ways...

...and you'll find that, as a consequence, there is one indicator best-suited to each of these uses.

If you're wondering which Forex volatility indicator MT4 has to offer, the answer is, there are several available.

The good news is that taken together they cover all the bases mentioned above.

These indicators include:

- parabolic SAR indicator
- momentum indicator, also known as
*rate of change* - volatility channels
- average true range indicator

Learn about how our Volatility Protection service keeps you safe from volatility risks.

Parabolic SAR was developed by J. Welles Wilder, a major innovator in the field of technical analysis.

The indicator's name stands for
*parabolic stop and reverse* and attempts to identify good entry and exit points.

It's important to note that it was designed
*only *for trending markets and is, therefore, not effective in range-bound markets.

What does this mean?

Well, it means you really have to use this one in tandem with a trend-identifying indicator.

As you can see from the daily USD/JPY chart above...

...the indicator plots a parabola-like curve of dots on your chart.

What's a parabola?

A parabola is a U-shaped curve.

Now, J. Welles Wilder made his name as a technical analyst in the field of commodities, but he first trained as an mechanical engineer.

We can see this part of his background creep in with the usage of the term
*parabola*.

The parabola is a curve commonly used in many parts of classical mechanics.

For example, the trajectory of a projectile is a parabolic path.

The characteristic curve results from the effect of gravity decreasing the projectile's velocity.

There is a similar tendency with trends.

Trends can endure for extended periods, but as we all know, they do not go on forever.

The driving force behind them always peters out eventually.

This indicator attempts to describe that behaviour.

It says that the trend is likely to stay within the arc of the curve plotted on the chart.

Should the price reach the curve, it suggests the trend may have ended.

Parabolic SAR is calculated for a day ahead as follows:

SAR tomorrow = SAR today + AF x (EP – SAR today)

Where:

- AF is an
*acceleration factor* - EP is the
*extreme point*– the highest value so far in an uptrend or the lowest value in a downtrend.

The acceleration factor is customarily set at an initial value of 0.02.

You may find a different value works better through trial and error though.

The best way to perform this kind of experimentation is in a risk-free environment, such as our demo trading account.

Now, as the trend progresses, the acceleration factor's value changes.

Each time the market reaches a new high in an uptrend or a new low in a downtrend, we increase the AF by a step.

The step is the initial value of the AF.

What's more, there is an upper constraint on the value of the AF...

...and you specify this maximum when you add the indicator in MT4.

The default value for this maximum in MetaTrader 4 is 0.20, as you can see in the image above.

Using the indicator is pretty simple.

The general guidelines can be summed up in these four points:

- when the SAR dots are under the current market price, it suggests an uptrend
- when the dots are above the current price, it suggests a downtrend
- consequently, if the SAR dots cross from above to below, it is a buy signal
- if the dots cross from below to above, it is a sell signal.

That's parabolic SAR in a nutshell.

Let's now move on to our next indicator.

Another volatility indicator that comes with MetaTrader 4 is the simply-named
* momentum indicator*.

It is also known as the
*rate of change indicator*, or ROC.

As its name suggests, it measures how quickly movement is changing.

The image above is the same daily USD/JPY chart from before...

...but this time with the momentum indicator plotted as a Forex volatility chart below.

Its value tells you the percentage change of the current market price from the price a set number of periods prior.

Usually, the default value for the number of periods is 20.

It's calculated as:

momentum = (current close – close
*n* periods ago) / close *n* periods ago x 100

One way to think of it is as a way of gauging the power behind a move.

This is why it is known as the
*momentum* indicator.

All fairly straightforward so far, but how can we use it?

The indicator gauges the strength or weakness of a trend, thus identifying possible reversal points.

How we do this is simple:

- the more positive the number, the stronger the upward trend
- the more negative the number, the stronger the downward trend.

Using these two points, we can make some assumptions.

As long as the magnitude of the momentum value remains large, we would expect the trend to continue.

If the value begins to tail off and heads back toward 0, it may be a sign that the trend is breaking down.

This gives us two general guides to the indicator:

- crossing from a negative value to a positive value is a buy signal
- crossing from a positive value to a negative value is a sell signal.

While the momentum indicator is a straightforward measure of volatility, it does also measure direction as well as rate of change.

A Forex volatility meter that dispenses with direction and tells you purely about the magnitude of volatility is Average True Range indicator, or ATR.

Volatility channels are a type of indicator that plot volatility-related lines above and below the market.

These lines are variously known as channels, envelopes or bands.

They widen as volatility increases and narrow as volatility decreases.

The most well-known volatility channel is the Bollinger band, though the Keltner channel indicator is another effective type.

Bollinger bands come as a standard indicator with MetaTrader 4.

But if you want a more comprehensive choice of volatility channels, you should consider the MetaTrader 4 Supreme Edition plugin.

MT4 Supreme Edition offers the aforementioned Keltner channel indicator, alongside an impressive bundle of other helpful tools.

Volatility channels help to gauge what we would consider normal for a market...

...and what is a divergence from the norm, whilst factoring volatility into the equation.

The channels or bands describe the outer boundaries of this normality.

If the market breaks out beyond this boundary, we are alerted to an unusual occurrence and can plan our trades accordingly.

Bollinger bands use multiples of the
*standard deviation* to calculate how far away the bands lie from the central measure of price.

A standard deviation is a statistical measure that quantifies the variation of a set of numbers.

A low standard deviation suggests that the numbers in the data set are close together.

A high standard deviation suggest a wider variability in the numbers.

The more volatile a market, the wider the variability of prices will be in a certain period...

…and consequently, the higher the standard deviation.

If you're interested in reading more on Bollinger bands, you can find a full explanation in our rundown of the Most Important Forex Indicators.

So which is the best forex volatility indicator?

It isn't necessarily a case of which one is the best, but how best to use them to meet your needs.

Indicators in general work better when used to complement each other.

For example, we said earlier that parabolic SAR only really works effectively when the market is in a trend.

You could perhaps use the momentum indicator as your primary indicator to first establish whether this condition is met.

The ADX Indicator could also be used to serve this purpose.

Here's the good news:

...with a bit of practice, you can start making more informed trading choices thanks to these volatility guides.