Williams %R (percent range) is a fast momentum oscillator very similar to Stochastic: it measures where the close is relative to the recent high-low range. The twist is the scale — it runs from 0 to −100, inverted, with 0 at the top. Once you flip that in your head, it reads like a faster Stochastic %K.
Reading it
- 0 to −20 — overbought (close near the recent high).
- −80 to −100 — oversold (close near the recent low).
- It is fast and reactive — good for early signals, prone to noise.
- Like all these tools, it can stay pinned at an extreme during a strong trend.
How to use it
Williams %R is most useful for timing in ranges and for spotting momentum shifts and divergence. A practical trend technique is the 'failure swing': in an uptrend, wait for %R to reach overbought, pull back, and then fail to make a new overbought reading on the next push — an early sign momentum is fading. As with every oscillator, pair it with trend context rather than fading extremes blindly.
Family resemblance
RSI, Stochastic, CCI, and Williams %R all measure momentum, just from different angles and on different scales. You do not need all of them — picking one or two you understand deeply beats cluttering the chart with redundant lines that mostly say the same thing. The next lesson is about using any of them without getting faked out.