Williams %R

Introduction

Williams %R (pronounced "percent R"), created by the trader Larry Williams, is a momentum oscillator that answers the same question as the Stochastic Oscillator — where is price closing within its recent range? — but flips the scale upside down, running from -100 to 0. It is a fast, simple read on whether price is pressing the top of its range (overbought) or the bottom (oversold). Because it's so closely related to the stochastic, it carries the same strengths and the same crucial caveat: it's excellent for timing and spotting momentum failures, and dangerous if read as an automatic reversal signal in a trend. This lesson explains the inverted scale, how to read it, its relationship to the stochastic, and how to use it well.

This builds on the RSI lesson and is a direct companion to the Stochastic Oscillator lesson — the three are the core bounded momentum oscillators.

Quick Definition

Williams %R measures where the close sits within the recent high-low range, on an inverted scale from -100 to 0. A reading near 0 means price is closing near the top of its range (overbought, above -20); a reading near -100 means near the bottom (oversold, below -80). It is essentially an inverted version of the stochastic %K.

The only thing that trips people up is the negative scale. Remember: 0 is the top (overbought), -100 is the bottom (oversold). Once that clicks, it reads exactly like any other range oscillator.

Reading the Inverted Scale

The scale is the one feature to internalise:

• Above -20 (near 0): overbought. Price is closing near the top of its recent range — strong upward momentum.
• Below -80 (near -100): oversold. Price is closing near the bottom of its range — strong downward momentum.
• Around -50: mid-range — price closing in the middle of its recent span, no momentum extreme.

So a Williams %R climbing toward 0 shows strengthening upward momentum, and one falling toward -100 shows strengthening downward momentum. It's a single line (no separate signal line like the stochastic's %D), which makes it clean and quick to read.

Its Relationship to the Stochastic

It's worth knowing that Williams %R and the Stochastic Oscillator are nearly the same indicator. Both measure the close's position within the high-low range over a lookback; Williams %R is effectively the inverse of the fast stochastic %K, mapped onto the -100 to 0 scale. In practice this means:

• They give very similar signals — you rarely need both on a chart at once.
• Williams %R is typically used unsmoothed (a single, responsive line), which makes it faster but noisier than the slow stochastic.
• Everything you know about reading the stochastic — the zones, divergence, the trend caveat — transfers directly to Williams %R, just flipped.

Choosing between them is mostly preference: some traders like Williams %R's single clean line and inverted scale; others prefer the stochastic's %K/%D crossover signals.

Using It Well (and the Caveat)

Williams %R is used like its cousins:

• Fade extremes in a range: buy oversold (below -80) near support, sell overbought (above -20) near resistance.
• Time pullbacks in a trend: in an uptrend, buy when %R dips oversold and turns back up; don't short overbought into strength.
• Watch for divergence: price making a new high while %R fails to reach a new extreme (a lower high) warns of fading momentum.

And the caveat is the same as for every oscillator: an extreme reading can persist in a strong trend. In a powerful uptrend, Williams %R can hug the top of its range (near 0, overbought) for an extended stretch while price keeps climbing. Reading "overbought" as "sell now" in a trend is the recurring oscillator mistake. Use the extremes with a read of the trend, not against it.

Common Misconceptions

• "-20 is low and -80 is high." It's the reverse — the scale is inverted. Near 0 is the top (overbought, above -20); near -100 is the bottom (oversold, below -80).
• "Overbought means sell." As with the stochastic and RSI, an extreme can persist in a strong trend. It's a momentum condition, not an automatic reversal.
• "You need both Williams %R and the stochastic." They're nearly identical — Williams %R is essentially an inverted stochastic %K. One is enough.
• "It predicts reversals." It flags momentum extremes and divergence, but it lags price and doesn't time turns precisely — confirm with structure or price action.

Real-World Application

A trader prefers Williams %R's single clean line for timing entries within a trend. On a stock in a steady uptrend, they ignore the temptation to short each time %R pushes above -20 (overbought), knowing the strong trend keeps it pinned near the top. Instead they wait for pullbacks that drag %R down below -80 (oversold); when it turns back up out of oversold, they buy the dip with the trend. The approach mirrors exactly how they'd use the stochastic — because Williams %R is essentially the stochastic, inverted. Near the eventual top, %R shows divergence — price a new high, %R a lower high — and they tighten up. A second trader, confused by the negative scale, kept buying at -80 thinking it was "high" and selling at -20 thinking it was "low," doing precisely the wrong thing. Reading the inverted scale correctly — and respecting the trend caveat — was the whole game.

Key Takeaways

• Williams %R measures the close's position in the recent high-low range on an inverted -100 to 0 scale.
• Near 0 (above -20) = overbought (top of range); near -100 (below -80) = oversold (bottom of range). Internalise the inverted scale.
• It is essentially an inverted Stochastic %K — very similar signals, usually one clean unsmoothed line; you rarely need both.
• Use it to fade ranges and time pullbacks in trends, and watch for divergence — but remember an extreme can persist in a strong trend.
• It's a momentum timing aid, not a precise reversal predictor — confirm with trend and price action.