What Does Williams %R Actually Read on ES 10-minute Charts?
Educational reference. Measured from 5,045 recorded values on E-mini S&P 500 10-minute charts through September 15, 2026.
The middle half of all readings sat between -73.68 and -20.69, with a median of -44.83.
Williams %R measures where the close sits in the recent range, expressed from 0 down to −100. This page reports what it actually read on E-mini S&P 500 10-minute charts — not what it is supposed to do, but the distribution of 5,045 recorded values over the last 90 days.
| Series | Median | Middle half | 5th / 95th | Full range |
|---|---|---|---|---|
| Williams %R | -44.83 | -73.68 – -20.69 | -94.19 / -3.77 | -100.00 – 0 |
The median is the middle reading, so a single unusual session cannot drag it. The middle half is where Williams %R sat on half of all bars — the range you should expect to see most of the time on this chart.
How often it reaches the levels people watch
| Reading | Bars | Share |
|---|---|---|
| Above -20 | 1,205 | 23.9% |
| Between -80 and -20 | 2,922 | 57.9% |
| Below -80 | 918 | 18.2% |
Williams %R spent 58% of its time between -80 and -20 on this chart. A reading beyond -20 appeared about once every 4 bars, and below -80 about once every 5. How rare a signal is matters as much as what it says.
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How this was measured
Every 10-minute bar of E-mini S&P 500 recorded in the last 90 days was read, and the values grouped without smoothing or filtering. Series with fewer than 400 readings are omitted rather than shown on thin evidence. These are recorded values, not forecasts.
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