📊 How to Read Sports Odds — Complete Beginner's Guide
Understanding odds is fundamental to following sports analytics and predictions. This guide explains the three main odds formats used worldwide.
1. Decimal Odds (European)
The most common format worldwide. The number represents your total return per $1 wagered.
Example: Arsenal at 2.50 means a $10 stake returns $25 total ($15 profit + $10 stake).
Formula: Payout = Stake × Decimal Odds
Implied probability: 1 ÷ 2.50 = 40%
2. Fractional Odds (British)
Traditional format used in the UK. Shows profit relative to stake.
Example: 5/2 means you win $5 for every $2 staked.
A $10 stake at 5/2: $25 profit + $10 stake = $35 total
Implied probability: 2 ÷ (5+2) = 28.6%
3. American Odds (Moneyline)
Used primarily in the US. Positive (+) shows underdog profit on $100 stake; negative (-) shows how much to stake for $100 profit.
+150: Stake $100 to win $150 profit (underdog)
-200: Stake $200 to win $100 profit (favorite)
Implied probability of -200: 200 ÷ (200+100) = 66.7%
📱 Quick Conversion Table
Decimal
Fractional
American
Probability
1.50
1/2
-200
66.7%
2.00
1/1 (Evens)
+100
50.0%
3.00
2/1
+200
33.3%
5.00
4/1
+400
20.0%
10.00
9/1
+900
10.0%
This is an educational guide about understanding odds formats in sports analytics. This site does not promote or facilitate gambling.