Converting between odds formats is a basic but essential skill for sports bettors who shop across international books or want to understand implied probability quickly. Here's the fastest way to do it.
The Conversion Formulas
American → Decimal:
- Positive American: decimal = 1 + (American/100) → +200 = 3.00
- Negative American: decimal = 1 + (100/|American|) → -150 = 1.667
American → Implied Probability:
- Positive odds: 100 / (American + 100) → +200 = 33.3%
- Negative odds: |American| / (|American| + 100) → -150 = 60.0%
Decimal → American:
- Decimal ≥ 2.0: American = (decimal - 1) × 100 → 3.00 = +200
- Decimal < 2.0: American = -100 / (decimal - 1) → 1.67 = -150
Decimal → Implied Probability:
- 1 / decimal → 2.50 = 40%
Quick Reference Table
| American | Decimal | Implied Probability | |—————|————-|——————————-| | -300 | 1.33 | 75.0% | | -200 | 1.50 | 66.7% | | -150 | 1.67 | 60.0% | | -110 | 1.91 | 52.4% | | +100 | 2.00 | 50.0% | | +150 | 2.50 | 40.0% | | +200 | 3.00 | 33.3% | | +400 | 5.00 | 20.0% |
Best Free Odds Converters
Oddible: Automatically shows implied probability and no-vig fair odds for every bet. No manual conversion needed.
Online tools: Multiple free web calculators convert between formats instantly.
Google: Simply searching "-150 to decimal odds" or "+200 implied probability" returns immediate answers.
[See converted odds and implied probability automatically in Oddible →]
