{"slug":"how-to-devig-betting-odds","qid":"book_overround","label":"Book sum and overround on four illustrative markets","post_title":"How to De-Vig Betting Odds Into Probabilities","post_url":"/blog/how-to-devig-betting-odds#q-book_overround","columns":["market","book_sum_pct","overround_pct"],"rows":[{"market":"Balanced -110 / -110","book_sum_pct":104.76,"overround_pct":4.76},{"market":"Lopsided -750 / +475","book_sum_pct":105.63,"overround_pct":5.63},{"market":"Decimal 1.1333 / 5.75","book_sum_pct":105.63,"overround_pct":5.63},{"market":"Three-way +100 / +230 / +300","book_sum_pct":105.3,"overround_pct":5.3}],"shape":"ranking","sql":"SELECT\n    b.2 AS market,\n    round(100.0 * arraySum(b.3), 2) AS book_sum_pct,\n    round(100.0 * (arraySum(b.3) - 1.0), 2) AS overround_pct\nFROM\n(\n    SELECT arrayJoin([\n        (1, 'Balanced -110 / -110',         [110.0 / 210.0, 110.0 / 210.0]),\n        (2, 'Lopsided -750 / +475',         [750.0 / 850.0, 100.0 / 575.0]),\n        (3, 'Decimal 1.1333 / 5.75',        [  1.0 / 1.1333, 1.0 / 5.75]),\n        (4, 'Three-way +100 / +230 / +300', [100.0 / 200.0, 100.0 / 330.0, 100.0 / 400.0])\n    ]) AS b\n)\nORDER BY b.1","computed_at":"2026-08-11T15:29:42.981470+00:00","elapsed":0.006905998}