IV is the market forecast of movement
Implied volatility turns an option price into a single number: how much the market expects the asset to move. Rich IV favours sellers, cheap IV favours buyers. Pair it with the options greeks calculator and volatility calculator.
IV: the market's fear gauge in a number
Implied volatility is the annualized move the options market is pricing in. BTC IV at 60% means the market expects a one-standard-deviation year of ±60%. The everyday conversion: daily expected move ≈ IV ÷ 19.1 (square root of 365). At 60% IV, that's ±3.1% as a normal day.
What it's for: pricing whether options are expensive. Historical (realized) volatility tells you what the coin actually did; IV tells you what you're paying for. When IV runs far above realized vol, option sellers are being overpaid — and buyers are funding someone's yield. The gap between the two is the volatility risk premium, and in crypto it's usually positive and fat.
IV also frames event pricing: before major announcements, IV inflates — a 90% IV into an ETF decision means the market has already priced a huge move. Buying options then isn't betting on movement; it's betting on more movement than an already-dramatic consensus. After the event, IV crushes back down and takes option value with it.