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Developed by Bill Williams as a development component of the Awesome Oscillator, it measures the difference between the Awesome Oscillator and the 5-period moving average. This indicator reflects the pace at which the Awesome Oscillator changes, while this can be used in order to detect trend reversals before the Awesome Oscillator indicates such.

In case the Accelerator Oscillator moves above the zero line, this is considered as a signal that acceleration to the upside will continue. In case the Accelerator Oscillator moves below the zero line, this is considered as a signal that acceleration to the downside will continue.

Generally, signals of a price surge are confirmed by two green bars following one another and the Accelerator Oscillator being above the centerline. Signals of a price decline are confirmed by two red bars following one another and the Accelerator Oscillator being below the centerline.

There is another way to look at this indicator &#; to search for signals when the Accelerator Oscillator is on the opposite side of the centerline. For instance, a trader should look to go long, when the Accelerator Oscillator is below the centerline and go short, when the Accelerator Oscillator is above the centerline. In both cases, however, further confirmation is required &#; at least one more bar. Therefore, when the indicator is below the zero line and the trader intends to go long, at least three green bars need to be present below the zero line. When the indicator is above the zero line and the trader intends to go short, at least three red bars need to be present above the zero line.

If you want a tool that will help you identify what momentum is doing when you are trading Forex, the Bill Williams Accelerator Oscillator may be of use to you.

This post will explain what this indicator is, how you can add it to your charts, and how you can use it as part of your Forex trading strategies.

What is the Bill Williams Accelerator Oscillator indicator?

The Bill Williams Accelerator Oscillator, often known simply as the Accelerator Oscillator, is an indicator that measures momentum.

It is closely related to the Awesome Oscillator, also developed by Bill Williams.

How is the Bill Williams Accelerator Oscillator indicator calculated?

The easiest way to understand the Accelerator Oscillator is to take a look at how it is calculated. AO below stands for Awesome Oscillator. SMA is short for a simple moving average.

Naturally, you also will want to know how the Awesome Oscillator is calculated. Here is the formula for the AO:

You do not need to do all of this math yourself. You can simply tell MetaTrader 4 (or whatever platform you are using) to plot the Accelerator Oscillator on your chart. It will take care of the hard work.

What does the Bill Williams Accelerator Oscillator indicator show us?

Now you know the math that is used when plotting the Accelerator Oscillator. But what is it actually showing you on your charts?

Williams explained the meaning of the Accelerator Oscillator by saying, "the zero line is the place where the momentum is balanced with the acceleration."

Here is how to interpret the Accelerator Oscillator:

• When you see the oscillator above the zero line, conditions are bullish. Acceleration can increase with ease. If you are thinking about buying, make sure you do not see red bars.
• When you see the oscillator below the zero line, conditions are bearish. Deceleration can increase with ease. If you are considering selling, make sure you do not see green bars.

How to plot the Bill Williams Accelerator Oscillator indicator on your charts

Adding the Bill Williams Accelerator Oscillator to your MetaTrader 4 charts is a breeze. Here is how to do it:

1. Navigate in the top menu to Insert→Indicators→Bill Williams→Accelerator Oscillator.
2. In the box that comes up, you can select your preferred colors. By default, they are green and red.
3. Click on OK to add the indicator to your chart. You will see the oscillator at the bottom in its own area below price.

How to use the Bill Williams Accelerator Oscillator indicator while you trade

There are a few ways you can approach using the Accelerator Oscillator. Note that it was designed to be used primarily in conjunction with other indicators, not on its own.

Below, you can see a straightforward example of a trade using the Accelerator Oscillator. On the chart, we circled a bullish pinbar, a price pattern that suggests price is about to rise.

If you look below it, you will see the oscillator is above zero, and most of the bars are green. This confirms bullish momentum, which lends favorable context to our bullish pinbar. Whether you entered right away or waited a little bit, you would have caught a significant move upward here.

Here is a chart where you can see consolidation forming at a swing high. Going off of the price action alone, you might have entered this trade immediately after the second inside bar.

By this point, the bars in the oscillator are dropping swiftly toward the zero line, and they are red, suggesting they will soon cross over—which they then do. If you wanted, you could even wait to enter until after you see the first red bar under the zero line. You would still catch part of the move.

Interestingly enough, you can also use the oscillator to help you identify setups you might not want to trade.

In the chart below, there is a well-formed pinbar that suggests price will drop. To be fair, it does—but only to form another pinbar, this time a bullish one.

The oscillator is below the zero line when the original pinbar forms, but look at it closely. The bars are green, and rising. That does not bode well for bearish momentum. Indeed, the oscillator illustrates the market context well, since we are looking at whipsaws and consolidation, as it turns out, and not a bearish move.

Price does eventually drop down, but it takes a number of bars before it happens. With loose enough stops, if you got in the trade at the original bearish pinbar, you could wait this out—but someone with tighter stops might have been stopped out.

In short, this wasn't necessarily a bad trade, but it was a dodgy one, and the oscillator provided great context on that fact.

General tips for using the Bill Williams Accelerator Oscillator indicator

• Use other indicators or price action. It is best to use this oscillator to confirm your setups, not generate them entirely.
• Consider using the Alligator indicator. This was the indicator that Bill Williams himself favored using in conjunction with the Accelerator Oscillator.
• Test. Just as you would with any other trading strategy, you should backtest and demo test any method you are thinking about using that incorporates this indicator.

Conclusion

The Bill Williams Accelerator Oscillator contextualizes your setups: knowing whether bullish or bearish momentum is likely to be on your side can be extremely helpful when you are trying to figure out whether to pull the trigger on a trade.

Try using the Accelerator Oscillator to analyze momentum and place context around your trade setups. The insights it offers may be just what you need to decide when to trade and when to hold off.

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The Accelerator Oscillator, also known as the Acceleration/Deceleration Indicator (AC), is an indicator for the use of technical analysis in financial trading.

It was developed by American technical trader, Bill Williams, and measures the acceleration and deceleration of the current driving force.

This is represented by a series of red or green bars, thus can provide an early warning to potential trend changes.

Bill Williams developed the Accelerator Oscillator alongside his Awesome Oscillator.

Specifically, the Accelerator Oscillator is the difference between the Awesome Oscillator and moving average of a period of 5.

Essentially, the Accelerator tells us the rate of change of the Awesome. The AC possesses just a single line (zero line), and unlike a lot of the other oscillators which aim to catch potential reversals, the AC does not have any overbought or oversold levels.

Thus, if the green bars move from below the zero line to above the zero line, there’s a higher chance that bullish acceleration will continue, and if the red bars move from above the zero line to below the zero line, there’s a higher chance that bearish acceleration will continue.

It can also be a useful indicator to keep a trader out of the market; if the AC histogram is red, longs should not be considered, and if the histogram is green, shorts should not be considered.

How to Trade Accelerator Oscillator

The default view in trading the Accelerator Oscillator is pretty simple. Bill Williams suggests that if you’re looking to enter into a bullish trend, look for two consecutive green bars above the zero line.

If you’re looking to enter into a bearish trend, look for two consecutive red bars below the zero line.

It can also be used to enter at turning point, i.e. before the AC reaches the middle line, and in such a case, a trader is to look for three consecutive green bars below the zero line if seeking a bullish reversal.

Likewise, three consecutive red bars above the zero line if seeking a bearish reversal. A simple adjustment of the rules gives the trader an option to trade either trends or reversals.

The accelerator (AC) is an indicator that reveals the driving force behind movements the price of an asset.

The AC indicator helps you identify reversals – where the price of an asset changes direction and moves from an uptrend to a downtrend or vice versa.

 By measuring how many buyers and sellers there are in a market, it helps you form a view on the future direction of a price and – crucially – how fast that movement may be. The AC indicator works best in trending markets.

Green bars for bulls, red bars for bears

The indicator appears in a box directly underneath the regular price chart. It has a zero line running horizontally along the middle with green/red bars above or below it.

The image below shows how the accelerator indicator appears on a chart:

The accelerator indicator's zero line marks the point where the number of traders buying and selling an asset are equal.

Reading the indicator to find the driving force

Green bars indicate a bullish market, where buyers outnumber sellers and prices are rising. The appearance of a green bar above the zero line gives you a buy signal. The taller a green bar is, the more buyers there are in the market and the stronger the driving force behind the rising price.

Red bars indicate a bearish market, where sellers outnumber buyers and prices are falling. The appearance of a red bar below the zero line gives you a sell signal. The lower a red bar is, the more sellers there are in the market and the stronger the driving force behind the declining price.

Look for reversals

The accelerator is a useful signal of market sentiment and can help you identify reversals, or changes in direction, of a price.

When the colour of the indicator's bars changes from red to green, for example, this can mean a downtrend is due to change to an uptrend, with the number of buyers increasing and prices starting to rebound upwards.

The image below shows the accelerator indicator providing a buy signal:

1. Green shaded area shows that the bars have turned from red to green indicating a reversal to the upside.

When the colour of the indicator's bars changes from green to red, this can mean an uptrend is due to reverse course, with more sellers entering the market and prices starting to fall.

The image below shows the accelerator indicator providing a sell signal:

Wait for confirmation

Before you place a trade based on the accelerator indicator's signals, it is a good idea to wait for at least two bars to form in any one colour. This will help confirm that a new trend is indeed forming.

For example, if you are looking for a buy signal, wait for at least two green bars to form above the zero line before placing a trade. If you are looking for a sell signal, wait for at least two red bars to form below zero.

Summary

In this lesson, you have learned

• … the accelerator (AC) is an oscillator indicator that reveals the driving force behind price movements.
• … the AC indicator helps you identify reversals – where the price of an asset changes direction and moves from an uptrend to a downtrend or vice versa.
• … the accelerator's zero line runs horizontally along the middle of the chart and marks the point where the number of traders buying and selling an asset are equal.
• … green bars indicate a bullish market, where buyers outnumber sellers and prices are rising.
• … the appearance of a green bar above the zero line provides a buy signal – the taller the green bar, the stronger the driving force behind price rises.
• … red bars indicate a bearish market, where sellers outnumber buyers and prices are rising.
• … the appearance of a red bar below the zero line provides a sell signal – the lower the red bar, the stronger the driving force behind price declines.
• … traders usually wait for at least two bars to form in any one colour – this helps confirm that a new trend is forming.