Sports Betting

Convert Betting Odds — American, Decimal & Fractional

Built by Kevin Glover · @gloverbuilds · Verified formula

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

In this article

Understanding the Three Odds Formats
Implied Probability — The Key Number
Why Implied Probabilities Sum to More Than 100%

Die Drei Formate

Dezimal (2,50): Standard in Deutschland/Europa. Amerikanisch (+150/-200): USA. Fraktional (3/2): britische Tradition. Alle drei drücken dasselbe aus: +150 = 2,50 = 3/2. In Deutschland verwenden alle Buchmacher Dezimalquoten.

Implizierte Wahrscheinlichkeit

Jede Quote impliziert eine Wahrscheinlichkeit. Dezimal 2,50 = 1/2,50 = 40%. Dezimal 1,50 = 66,7%. Die Summe der Wahrscheinlichkeiten übersteigt immer 100% — die Differenz ist die Buchmacher-Marge.

⚡ 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

Wie rechne ich amerikanisch in dezimal um?▾

Positiv: (Quote/100) + 1. +150 = 2,50. Negativ: (100/|Quote|) + 1. -200 = 1,50.

Was ist die implizierte Wahrscheinlichkeit?▾

Die Wahrscheinlichkeit laut Quote. Dezimal 2,50 = 40%. Das ist was der Buchmacher „glaubt".

✓ Math logic verified against primary sources → See our verification process

Kevin Glover · @gloverbuilds

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 →