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OPTIONS · VOLATILITY

Options IV vs Realized Volatility: Match the Horizon Before Comparing

Implied volatility looks forward over an option's life. Realised volatility looks back over a window you choose. Compare them only over matching horizons.

By ChartsPod Editorial Team · Reviewed by ChartsPod Research
Published · Updated · 5 min read

Short answer

Implied volatility (IV) is the market's annualised expectation of volatility over an option's remaining life, backed out from its price. Realised volatility (RV) is the annualised standard deviation of past returns over a window. To compare them, match the horizon (a 30-day option's IV with 30-day RV), use the same annualisation (crypto trades 365 days, so √365) and the same return frequency. Mismatched horizons produce false 'cheap' or 'expensive' readings.

Two measures

IV vs RVIV vs RV. Left, Implied (IV): Forward-looking; From option prices; Per expiry/strike; Includes risk premium. Right, Realised (RV): Backward-looking; From returns; Window you choose; No premium.IMPLIED (IV)Forward-lookingFrom option pricesPer expiry/strikeIncludes risk premiumREALISED (RV)Backward-lookingFrom returnsWindow you chooseNo premium
Different time directions; match horizons. Original ChartsPod editorial graphic.

Calculating RV

RV = standard deviation of daily log returns × √365 (crypto trades every day). For hourly returns, multiply by √(24 × 365). Illustrative: daily return standard deviation 3% → RV ≈ 3% × 19.1 = 57%.

WindowRV (illustrative)
7-day72%
30-day55%
90-day48%
Illustrative: 30-day IV vs RV by window (%)Illustrative: 30-day IV vs RV by window (%): 30d IV 58 %; 7d RV 72 %; 30d RV 55 %; 90d RV 48 %.ILLUSTRATIVE: 30-DAY IV VS RV BY WINDOW (%)30d IV58 %7d RV72 %30d RV55 %90d RV48 %
Against 7d RV the option looks cheap; against 90d it looks expensive. Original ChartsPod editorial graphic.

Rules

Fair IV vs RV comparisonFair IV vs RV comparison: Match horizon to option tenor; Annualise with √365 for crypto; Same return frequency; Use ATM IV for a single number; Note events inside the window.FAIR IV VS RV COMPARISONMatch horizon to option tenorAnnualise with √365 for cryptoSame return frequencyUse ATM IV for a single numberNote events inside the window
Mismatches create false signals. Original ChartsPod editorial graphic.

IV usually exceeds subsequent RV on average because option sellers demand a premium, but that varies with events. See Bitcoin Options Skew vs Put-Call Ratio: Different Sentiment Inputs for skew.

Events inside the window

A single large move inside the realised window can dominate RV. If a 15% day falls inside the last 30 days, 30-day RV will be inflated until it rolls out, which can make IV look cheap. Compare RV with and without known event days, and check whether the option's expiry spans a scheduled event that could justify higher IV.

Conclusion

Compare IV with RV over the same horizon and annualisation before calling options cheap or expensive.

Open the volatility surface and compare tenors.

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Review Options IV vs Realized Volatility with bar replay before using it live.

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Questions readers ask

What is realised volatility?

Annualised standard deviation of past returns over a window.

How do I annualise for crypto?

Multiply daily standard deviation by √365.

Why compare IV and RV?

To judge whether options price more or less movement than recently occurred.

Sources and methodology

Derivatives definitions come from Binance's USD-M market data documentation, Hyperliquid's funding documentation, Bybit's liquidation rules and Deribit Insights, as read on 17 October 2026. ChartsPod features were checked on its public pages. Examples use illustrative numbers.

  1. Deribit Insights: Genesis Volatility options data guide — skew, smile, term structure.

This article explains research tools and workflows. It is not financial advice, does not recommend buying or selling any asset and does not predict prices. Crypto derivatives carry a risk of rapid and total loss of margin.

CHARTSPOD EDITORIAL EDITION · RESEARCH AND EDUCATION ONLY · NOT FINANCIAL ADVICE.