What Does Relative Strength Index Actually Read on SPY 5-minute Charts?
Educational reference. Measured from 9,548 recorded values on SPDR S&P 500 ETF 5-minute charts through September 4, 2026.
The middle half of all readings sat between 43.50 and 60.19, with a median of 51.69.
Relative Strength Index measures where price sits within its own recent gains and losses, on a 0–100 scale. This page reports what it actually read on SPDR S&P 500 ETF 5-minute charts — not what it is supposed to do, but the distribution of 9,548 recorded values over the last 90 days.
| Series | Median | Middle half | 5th / 95th | Full range |
|---|---|---|---|---|
| Relative Strength Index | 51.69 | 43.50 – 60.19 | 31.79 / 73.50 | 7.10 – 97.64 |
The median is the middle reading, so a single unusual session cannot drag it. The middle half is where Relative Strength Index 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 70 | 742 | 7.8% |
| Between 30 and 70 | 8,443 | 88.4% |
| Below 30 | 363 | 3.8% |
Relative Strength Index spent 88% of its time between 30 and 70 on this chart. A reading beyond 70 appeared about once every 13 bars, and below 30 about once every 26. How rare a signal is matters as much as what it says.
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How this was measured
Every 5-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.