{"slug":"how-implied-volatility-is-calculated","qid":"contract_trace","label":"One AAPL contract, re-solved every session into its July 17, 2026 expiry","post_title":"How Implied Volatility Is Calculated","post_url":"/blog/how-implied-volatility-is-calculated#q-contract_trace","columns":["date","implied_vol_pct","days_to_expiry"],"rows":[{"date":"2026-06-01","implied_vol_pct":25.1,"days_to_expiry":46},{"date":"2026-06-02","implied_vol_pct":24.9,"days_to_expiry":45},{"date":"2026-06-03","implied_vol_pct":15.5,"days_to_expiry":44},{"date":"2026-06-04","implied_vol_pct":26.1,"days_to_expiry":43},{"date":"2026-06-05","implied_vol_pct":25.7,"days_to_expiry":42},{"date":"2026-06-08","implied_vol_pct":25.6,"days_to_expiry":39},{"date":"2026-06-09","implied_vol_pct":23.4,"days_to_expiry":38},{"date":"2026-06-10","implied_vol_pct":25.9,"days_to_expiry":37},{"date":"2026-06-11","implied_vol_pct":22.5,"days_to_expiry":36},{"date":"2026-06-12","implied_vol_pct":21.5,"days_to_expiry":35},{"date":"2026-06-15","implied_vol_pct":22.1,"days_to_expiry":32},{"date":"2026-06-16","implied_vol_pct":21.9,"days_to_expiry":31},{"date":"2026-06-17","implied_vol_pct":20.9,"days_to_expiry":30},{"date":"2026-06-18","implied_vol_pct":23,"days_to_expiry":29},{"date":"2026-06-22","implied_vol_pct":25.1,"days_to_expiry":25},{"date":"2026-06-23","implied_vol_pct":22.8,"days_to_expiry":24},{"date":"2026-06-24","implied_vol_pct":26.6,"days_to_expiry":23},{"date":"2026-06-25","implied_vol_pct":26.3,"days_to_expiry":22},{"date":"2026-06-26","implied_vol_pct":25.3,"days_to_expiry":21},{"date":"2026-06-29","implied_vol_pct":25.8,"days_to_expiry":18},{"date":"2026-06-30","implied_vol_pct":24.8,"days_to_expiry":17},{"date":"2026-07-01","implied_vol_pct":24.6,"days_to_expiry":16},{"date":"2026-07-02","implied_vol_pct":24,"days_to_expiry":15},{"date":"2026-07-06","implied_vol_pct":28.2,"days_to_expiry":11},{"date":"2026-07-07","implied_vol_pct":23.7,"days_to_expiry":10},{"date":"2026-07-08","implied_vol_pct":32.4,"days_to_expiry":9},{"date":"2026-07-09","implied_vol_pct":37.1,"days_to_expiry":8},{"date":"2026-07-10","implied_vol_pct":29.1,"days_to_expiry":7},{"date":"2026-07-13","implied_vol_pct":26.6,"days_to_expiry":4}],"shape":"series","sql":"WITH (\n         SELECT ticker\n         FROM global_markets.options_greeks\n         WHERE underlying_symbol = 'AAPL'\n           AND date = toDate('2026-06-30')\n           AND expiration_date = toDate('2026-07-17')\n           AND iv_converged = 1\n           AND volume > 0\n         ORDER BY volume DESC\n         LIMIT 1\n     ) AS pinned_contract\nSELECT date,\n       round(100 * avg(toFloat64(implied_volatility)), 1) AS implied_vol_pct,\n       round(avg(days_to_expiry)) AS days_to_expiry\nFROM global_markets.options_greeks\nWHERE ticker = pinned_contract\n  AND date BETWEEN toDate('2026-06-01') AND toDate('2026-07-17')\n  AND iv_converged = 1\n  AND volume > 0\nGROUP BY date\nORDER BY date","computed_at":"2026-08-25T14:06:53.397477+00:00","elapsed":0.00281726}