BTC: Parkinson Volatility Ratio (30 Days)
Shown as its 3 Oct – 1 Nov 2026 sample; the latest readings and full history are included with Plus.
The 30-day Parkinson high-low volatility of BTC divided by its 30-day close-to-close volatility.
Why use it. Parkinson volatility uses each day's high and low, so it catches large intraday ranges that closes miss. The ratio says whether the market is doing a lot inside the day and ending near where it started. How to read it. Near 1: ranges match close-to-close moves. Above 1: large intraday swings that mostly reverse by the close, common in choppy markets. Below 1: steady trends.
Calculation. Parkinson variance is the mean of (ln(high/low))^2 / (4 ln 2) over the last 30 days; close-to-close variance is the mean of squared daily log returns; the ratio is the square root of their quotient, from the highs, lows and closes of our BTC price index.