Technical Glossary / Technical Indicators – Momentum Indicators
Williams %R
Where the close sits in the recent range, scaled from 0 at the high to -100 at the low.
Teaching sketch. It shows the shape, not a live quote and not a trade signal.
Formula
%R = -100 x (highest high N - close) / (highest high N - lowest low N). The usual N is 14.
Definition
Williams %R is the stochastic location question with the sign flipped and the scale running from 0 down to -100. Near 0 the close is at the top of the range. Near -100 it is at the bottom. Larry Williams used -20 and -80 as the hot zones. It will tell the same story as a fast stochastic of the same length, mirrored.
How it works
Because it uses the raw high and low, one spike high pins the top of the scale until that spike ages out of the window. The reading can stay near 0 for the whole trend. That is strength. The turn away from the extreme, not the extreme itself, is the information.
Bullish reading
A rise from below -80, with price holding a low, is the bullish cross in a range. In an uptrend, returns to -80 that turn up are pullbacks.
Bearish reading
A fall from above -20, with price failing at a high, is the bearish version. Pinning near 0 is not a short by itself.
Common mistakes
Forgetting the scale is negative and reading -10 as "worse than -90." -10 is near the highs. Also duplicating stochastic and %R and calling them independent.
Limitations
Identical inputs to the stochastic denominator mean identical weaknesses. A one-bar range spike dominates the lookback. Check the high and low that created the number.
This note explains the term. A sketch shows the shape of the idea. Neither is a recommendation, a signal, or a comment on any security. Indicator settings and exchange conventions differ. Check the live chart and the contract specification before you use a number.