Odds Converter
Convert odds between decimal, fractional, American and implied probability.
Odds Converter
Enter odds in any format, get all 4 instantly.
Equivalents
Decimal
2.000
Fractional
1/1
American
+100
Implied prob.
50.00%
CalculaBet.com
📚 Guide
Understanding odds formats
Decimal, fractional, American: all explained
🔢Why several formats?▼
Bookmakers display odds differently by country. Decimal (2.00) dominates in Europe, fractional (1/1) in the UK, and American (+100) in the US. They all express the same thing: the ratio between stake and winnings.
Implied probability translates the odds into a percentage chance estimated by the bookmaker (margin included). It's the most useful info to judge whether odds have value.
🧮Conversion formulas▼
Implied prob = 100 / decimal odds
Decimal to American: if odds ≥ 2, it's (odds−1)×100 positive. If < 2, it's −100/(odds−1). Fractional is just (odds−1) expressed as a fraction.
Practical tips
📌 Remember that 2.00 = +100 = 1/1 = 50%: the tipping point.
📌 Higher decimal odds = lower estimated chance = bigger potential win.
📌 Always compare implied probability to your own estimate: that's the basis of value.