The Williams %R indicator, developed by trader Larry Williams, is an oscillator similar in construction to the stochastic but built on an inverted scale, which often confuses traders encountering it for the first time. Despite that quirk, Williams %R remains a useful tool for finding overbought and oversold zones in binary options trading.
How Williams %R is calculated
Williams %R shows the current closing price's position within the high-low range over a chosen period, similar to the stochastic's %K line. The difference is that its scale is inverted and runs from 0 to -100: values closer to 0 mean price is near the top of the range, values closer to -100 mean price is near the bottom.
The inverted scale: a common source of mistakes
That inverted scale is Williams %R's defining feature, and it often trips up traders used to the regular 0-to-100 scale of RSI and the stochastic. The overbought zone on Williams %R sits near 0 rather than near 100 — specifically, readings above -20 — while the oversold zone sits near -100, readings below -80.
Overbought and oversold zones
The classic interpretation of Williams %R relies on two threshold levels:
- Overbought zone (above -20) — price sits near the top of its range, raising the odds of a downward correction.
- Oversold zone (below -80) — price sits near the bottom of its range, raising the odds of an upward correction.
As with RSI and the stochastic, the standard approach is to trade the exit from an extreme zone back toward the center of the scale, not the entry into it.
How Williams %R differs from the stochastic
Williams %R and the stochastic are calculated from similar data — price's position within the high-low range — and give signals with a similar meaning, differing mainly in display scale and the absence of a smoothing %D line in Williams %R. Without that smoothing, Williams %R reacts to price changes faster but gives noisier signals than the stochastic.
Williams %R compared with CCI
Unlike CCI, which has no fixed scale bounds, Williams %R is always confined to the 0-to-100 range, making extreme readings easier to interpret unambiguously but less informative during very strong price moves. For a detailed look at CCI's features, see the article on the CCI indicator.
Tuning the Williams %R period
The standard calculation period for Williams %R is 14, matching RSI and the stochastic's %K line. On short binary options timeframes, the period is sometimes shortened to 7–10 for a faster reaction to price changes, at the cost of a higher risk of false signals from noise.
Limitations of Williams %R
Like most oscillators, Williams %R performs poorly during a strong directional trend, staying in an overbought or oversold zone for a long time without a real reversal. For more on why oscillators are unreliable in a trend and how to identify the right market regime, see the article on oscillators and trend indicators.
Automating Williams %R calculation
Calculating the Williams %R value and identifying overbought and oversold zones is easy to automate. A trading robot for Pocket Option can account for Williams %R signals together with a market-regime filter — details on the features page.
Conclusion
The Williams %R indicator gives a fast signal for overbought and oversold conditions, but it takes some getting used to with its inverted scale, and like other oscillators it's unreliable during a strong trend without additional filters. Compare Williams %R signals with other oscillators and trend indicators before deciding on a trade. Automatic calculation is available in the robot's plans.