Parkinson Volatility Calculator (High-Low)
Range-based daily volatility estimate from high and low — ~5× more efficient than close-to-close per observation.
Formula
Parkinson exploits the whole intraday range instead of two closes, gaining statistical efficiency — but it ignores overnight gaps, so it understates true vol for gappy names. Vol desks blend it with close-to-close and Garman-Klass estimators.
Not financial advice — for informational and analytical use only. Verify all figures with a qualified professional before acting on them.
Need parkinson volatility calculator results fast? Analysts, founders, traders and finance professionals use the Parkinson Volatility Calculator to skip the spreadsheet and get a defensible answer in one step — free, private and instant.
About Parkinson Volatility Calculator (High-Low)
Range-based daily volatility estimate from high and low — ~5× more efficient than close-to-close per observation. Parkinson exploits the whole intraday range instead of two closes, gaining statistical efficiency — but it ignores overnight gaps, so it understates true vol for gappy names. Vol desks blend it with close-to-close and Garman-Klass estimators. The governing relationship is σ²_P = ln²(H/L) / (4·ln 2). The Parkinson Volatility Calculator computes entirely in your browser — free, private (your figures never leave your device) and instant, recalculating live as you change any input.
How to use Parkinson Volatility Calculator (High-Low)
- 1Enter Day high, Day low, Current IV (compare) (%) into the Parkinson Volatility Calculator.
- 2The result is computed automatically using σ²_P = ln²(H/L) / (4·ln 2) — there is no button to press.
- 3Change any input to model a different scenario, then copy or share the result.
Why use Parkinson Volatility Calculator (High-Low)?
- ✓Computes parkinson volatility calculator instantly with the correct formula — no spreadsheet needed
- ✓100% free and unlimited, with no sign-up, login or paywall
- ✓Runs entirely in your browser, so the figures you enter stay private
- ✓Shows the formula, a live worked example and references so you can defend the number
Frequently asked questions
What is the formula behind the Parkinson Volatility Calculator?+
Parkinson Volatility Calculator uses σ²_P = ln²(H/L) / (4·ln 2). Parkinson exploits the whole intraday range instead of two closes, gaining statistical efficiency — but it ignores overnight gaps, so it understates true vol for gappy names. The tool substitutes your actual inputs into this relationship and shows the worked example step by step.
What inputs does the Parkinson Volatility Calculator need?+
Enter Day high, Day low, Current IV (compare) (%) and the result updates immediately — there is no button to press. Change any value to model a different scenario in real time.
Is the Parkinson Volatility Calculator free, and is my data private?+
Yes — it is completely free with no sign-up or usage limit, and it runs entirely in your browser, so the numbers you enter are never uploaded or stored on any server. It is for informational and analytical use, not financial advice.
What should I watch out for when using the Parkinson Volatility Calculator?+
Vol desks blend it with close-to-close and Garman-Klass estimators.
What is the Parkinson Volatility Calculator based on?+
The method follows authoritative sources: Parkinson (1980), Journal of Business. The formula and references are shown on the page so you can verify and cite the result.
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