What Does Average True Range Actually Read on SPY 1-minute Charts?
Educational reference. Measured from 44,744 recorded values on SPDR S&P 500 ETF 1-minute charts through September 4, 2026.
The middle half of all readings sat between 0.1150 and 0.3141, with a median of 0.1883.
Average True Range measures how much ground a bar typically covers, so it describes volatility rather than direction. This page reports what it actually read on SPDR S&P 500 ETF 1-minute charts — not what it is supposed to do, but the distribution of 44,744 recorded values over the last 90 days.
| Series | Median | Middle half | 5th / 95th | Full range |
|---|---|---|---|---|
| Average True Range | 0.1883 | 0.1150 – 0.3141 | 0.0659 / 0.5958 | 0.0229 – 2.99 |
The median is the middle reading, so a single unusual session cannot drag it. The middle half is where Average True Range 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 1-minute bar of SPDR S&P 500 ETF 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.