What Does Standard Deviation Actually Read on ES 10-minute Charts?
Educational reference. Measured from 449 recorded values on E-mini S&P 500 10-minute charts through September 25, 2026.
The middle half of all readings sat between 2.38 and 5.83, with a median of 3.97.
Standard Deviation measures how widely price has been scattered around its own average. 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 449 recorded values over the last 90 days.
| Series | Median | Middle half | 5th / 95th | Full range |
|---|---|---|---|---|
| Standard Deviation | 3.97 | 2.38 – 5.83 | 1.39 / 12.55 | 0.7827 – 20.35 |
The median is the middle reading, so a single unusual session cannot drag it. The middle half is where Standard Deviation sat on half of all bars — the range you should expect to see most of the time on this chart.
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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.