Direct Answer
Decimal odds express the total return per $1 staked, including the stake itself. A decimal price of 2.50 returns $2.50 on a $1 winning bet ($1.50 profit). They are the default outside the US and the easiest format for EV math.
Key Takeaways
- Decimal = total return per $1.
- Implied probability = 1 / decimal.
- Easiest format for EV and Kelly math.
Reading and converting
Total return = stake × decimal odds. Profit = stake × (decimal odds − 1). Implied probability = 1 / decimal odds. 2.50 implies 40.0%; 1.91 implies 52.4%.
Why pros prefer decimal
EV calculations, Kelly sizing, and CLV tracking all become arithmetic instead of conversion. Most pricing models, books, and analytics platforms operate in decimal natively.
Frequently asked questions
Is 1.91 the same as –110?+
Yes — both imply 52.4% and represent the standard juiced line.
Educational only. Not wagering, financial, or legal advice. See our editorial policy.