# Implied volatility: what an option price says, and what it does not

Implied volatility is the volatility input consistent with an option’s observed price under a chosen pricing model and other inputs. It differs from historical volatility measured from past returns. Higher implied volatility generally raises otherwise comparable call and put values; it does not specify whether the underlying will rise or fall.

Evidence: [Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks); [Options Pricing](https://www.optionseducation.org/optionsoverview/options-pricing); [Inverse Options](https://support.deribit.com/api/v2/help_center/en-us/articles/31424939096093.json)

Canonical: https://degreesofsatoshi.com/encyclopedia/implied-volatility-options/
Published: 2026-10-02
Substantively modified: 2026-10-02
Independently verified by an automated reviewer: 2026-10-02T19:18:00.092Z
Data current through: 2026-10-02

AI-assisted research and drafting with a separate automated source-verification pass; no external expert or named human review is implied.

## Key facts

- **Historical:** Historical volatility is calculated from observed past price changes. ([Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks))
- **Implied:** Implied volatility is inferred from option pricing. ([Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks))
- **Vega:** Vega describes modeled sensitivity to an implied-volatility change. ([Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks))

## Hold the other inputs steady

Imagine the same option evaluated at the same underlying price, strike and remaining time, but with a higher market premium. A pricing model can translate that change into a higher implied volatility. It does not follow that the seller now expects a specific upward move.

Comparing different strikes or expiries introduces other differences, so a single percentage needs its contract context.

Evidence: [Options Pricing](https://www.optionseducation.org/optionsoverview/options-pricing); [Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks)

## Treat Greeks as local estimates

For an invented vega of 0.20 quote units per one percentage-point change in IV, a three-point increase estimates a 0.60 rise in option value if other inputs stay fixed. Actual changes can differ because sensitivities and market prices move together. The estimate is not a guaranteed tradable gain.

Evidence: [Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks)

## The displayed model matters

Deribit’s inverse-option documentation says its displayed IV uses the forward rather than the spot index as the underlying input. Two platforms can therefore show different IVs if their prices or modeling assumptions differ. A high IV alone does not establish that an option is overpriced; that conclusion requires a view about future outcomes and costs.

Evidence: [Inverse Options](https://support.deribit.com/api/v2/help_center/en-us/articles/31424939096093.json)

## Questions

### Does 80% IV mean an 80% chance the asset rises?

No. IV is a modeled measure of price variability, not that directional probability.

Evidence: [Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks); [Options Pricing](https://www.optionseducation.org/optionsoverview/options-pricing)

## Claims and scope

### implied-volatility-options-quick-answer

Implied volatility is the volatility input consistent with an option’s observed price under a chosen pricing model and other inputs. It differs from historical volatility measured from past returns. Higher implied volatility generally raises otherwise comparable call and put values; it does not specify whether the underlying will rise or fall.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### implied-volatility-options-fact-historical

Historical: Historical volatility is calculated from observed past price changes.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### implied-volatility-options-fact-implied

Implied: Implied volatility is inferred from option pricing.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

### implied-volatility-options-fact-vega

Vega: Vega describes modeled sensitivity to an implied-volatility change.

Scope: {"collection":"defi","dataAsOf":"2026-10-02","blockHeight":null}

## Sources

- [Volatility and the Greeks](https://www.optionseducation.org/advancedconcepts/volatility-the-greeks) — Options Industry Council. Model-implied volatility and its interpretation. Locator: Historical versus implied volatility. Retrieved: 2026-10-02T18:53:21.280Z.
- [Options Pricing](https://www.optionseducation.org/optionsoverview/options-pricing) — Options Industry Council. Option price components and model inputs. Locator: Intrinsic value; Time value; Premium inputs. Retrieved: 2026-10-02T18:53:21.237Z.
- [Inverse Options](https://support.deribit.com/api/v2/help_center/en-us/articles/31424939096093.json) — Deribit. Official support article retrieved through its public Help Center API; inverse settlement specifications. Locator: Settlement process change; Settlement examples. Retrieved: 2026-10-02T18:53:21.588Z.

## Revision history

- 2026-10-02: First publication after primary-source research and separate automated verification.

## Cite this entry

Degrees of Satoshi editorial project. “Implied volatility: what an option price says, and what it does not.” Published 2026-10-02; updated 2026-10-02. https://degreesofsatoshi.com/encyclopedia/implied-volatility-options/