Question 1

What is implied volatility?

Accepted Answer

It is the volatility figure that, plugged into an option-pricing model (Black-Scholes), reproduces the option market price. It reflects how much movement the market expects — higher IV means the market is pricing bigger swings and options cost more.

Question 2

How do I use implied volatility?

Accepted Answer

Compare it to realized (historical) volatility. When IV is much higher than what the asset actually does, options are expensive — better to sell premium. When IV is low relative to coming events, options can be cheap to buy. IV, not direction, drives an option buyer edge.

インプライド・ボラティリティ計算ツール

IVは市場の動きの予測