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Sports Betting

Convert Betting Odds — American, Decimal & Fractional

Convert between American (+150), Decimal (2.50), and Fractional (3/2) odds instantly. See implied probability for any format.

📅 Updated April 2026 Formula verified 📖 4 min read 🆓 Free · No sign-up

Os Três Formatos

Americanas (+150, -200): mais comuns nos EUA. Decimais (2,50): padrão no Brasil e Europa. Fracionárias (3/2): tradição britânica. As três expressam a mesma coisa: +150 = 2,50 = 3/2. No Brasil, as casas de apostas usam odds decimais como padrão (Bet365, Betano, Sportingbet).

Probabilidade Implícita

Cada odd implica uma probabilidade. Decimal 2,50 = 1/2,50 = 40%. Decimal 1,50 = 66,7%. A soma das probabilidades implícitas sempre excede 100% — a diferença é a margem da casa.

⚡ CalcWolf Insight

The best odds format for spotting value is implied probability. Train yourself to think in probabilities rather than odds — instead of seeing -150, think "60% implied." Then ask: do I believe this outcome has more or less than a 60% chance? If more, pass. If less, bet the other side.

Frequently asked questions
Como converter americana para decimal?
Positivas: (odd/100) + 1. +150 = 2,50. Negativas: (100/|odd|) + 1. -200 = 1,50.
O que é probabilidade implícita?
A probabilidade de um resultado segundo a odd. Decimal 2,50 = 40%. É o que a casa "acredita" que vai acontecer.
✓ Math logic verified against primary sources → See our verification process
Kevin Glover
Founder, CalcWolf · GLVTS · Blickr
All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →
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