Awesome Oscillator

What is the Awesome Oscillator?

The Awesome Oscillator (AO) is Bill Williams' momentum histogram: a 5-period simple moving average of the bar midpoint (high plus low, halved) minus a 34-period SMA of the same midpoint. The parameters are fixed by design; Williams specified 5/34 on median price within his Chaos framework, where AO runs alongside the Alligator and fractal signals. Each histogram bar is colored by whether it rose or fell versus the prior bar, and that bar-to-bar change carries much of the signal meaning.

Reading it is a two-layer exercise: the zero line splits the momentum regime (short average above long is bullish, below is bearish), while color changes track acceleration within the regime. Williams defined three named entries on this base: the zero-line cross, the saucer, and twin peaks. The same construction, give or take a period, underlies the 5/35 Oscillator used in Elliott wave counting, so AO also serves as a rough wave-strength gauge. Being unbounded, it has no fixed overbought level; extremes are judged relative to recent history.

How to read the Awesome Oscillator

AO's named signals all come from the histogram's position relative to zero and its bar-to-bar direction.

1. 1Zero-line cross: the histogram moving from negative to positive shifts the momentum regime bullish (and vice versa); it is the simplest and slowest of the named signals.
2. 2Saucer (bullish case): with the histogram above zero, two consecutive falling bars followed by a rising bar form the saucer, a dip-and-resume pattern within an uptrend. The bearish mirror forms below zero.
3. 3Twin peaks (bullish case): entirely below zero, a trough, a bounce that stays below zero, then a shallower trough followed by a rising bar; if the histogram crosses zero between the troughs, the count resets.
4. 4Divergence: price making a new extreme while AO makes a lesser one reads like any regular divergence, a warning that thrust is fading rather than a standalone reversal signal.

How it's calculated

Momentum histogram equal to the difference between a fast and a slow simple moving average of the bar's median price.

Defined by Bill Williams with fixed 5/34 lengths; platforms rarely expose them as inputs.

Plotted as a histogram around zero, colored by bar-to-bar change; zero-line crosses, saucers, and twin peaks are the classic readings.

The related Accelerator Oscillator is AO_t - SMA_5(AO)_t.

How traders use it

• As the momentum leg of Williams' Chaos system, where AO signals are taken in agreement with the Alligator's trend read and fractal breakouts rather than in isolation.
• As a wave-strength gauge in Elliott-style analysis: in that tradition the strongest AO extreme accompanies the third wave, and a weaker peak on a fifth-wave price high is the classic exhaustion tell.
• As a blunt regime filter: longs only while the histogram is above zero, shorts only below, keeping faster signals pointed with medium-term momentum.
• As a divergence scanner on swing highs and lows, where the fixed 5/34 parameters make readings comparable across symbols and timeframes.

Awesome Oscillator vs. similar oscillators