Implied volatility, Historical Volatility, Volatility Score and Percentile

General
1

Came across these terms, many saying important in option buying game.

As implied volatility is of options, i want to know how it is calculated and for how much time it lasts?

2

https://www.business-standard.com/article/markets/how-to-measure-and-interpret-implied-volatility-iv-for-trading-options-119060700156_1.html

You don’t need to calculate IV, it’s present in NSE option Chain itself.
Based on IV you can calculate Option Greeks using Black Scholes Calculator.

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