Point Spread Odds Calculator
Express point spreads as moneylines and implied probabilities to gauge the line.
How to Use This Calculator
- Input the point spread (e.g., -3.5 for a 3.5-point favorite)
- Input the juice/vig (default -110)
- Read the implied win probability and equivalent moneyline for each side
Formula
Implied Probability from Juice:
- For negative odds: Probability = |Odds| / (|Odds| + 100)
- For positive odds: Probability = 100 / (Odds + 100)
Spread to Moneyline (approximation):
- Each point of spread ≈ 2.75% shift from 50/50
Probability to American Moneyline:
- If prob ≥ 50%: Moneyline = -100 × prob / (1 - prob)
- If prob < 50%: Moneyline = +100 × (1 - prob) / prob
Frequently Asked Questions
How does a point spread work?
A point spread is a handicap assigned to the favored team to balance the action. A team at -3.5 must win by 4 or more points to cover. The underdog at +3.5 covers by winning outright or losing by 3 points or fewer.
What is the method for converting a spread to a moneyline?
Each spread point maps to roughly 2.75% of win probability. A -3.5 spread implies approximately 59.6% win probability, which translates to about a -148 moneyline on the favorite.
What do juice and vig refer to?
Juice (or vig) is the commission the sportsbook applies. The standard is -110 per side, meaning a $110 stake is required to win $100. This embedded margin guarantees the sportsbook a profit regardless of the result.
Is this conversion precise?
The spread-to-moneyline conversion is an approximation. The precise relationship varies with the sport, the specific matchup, and market conditions. Treat it as a fast reference, best suited to NFL and NBA betting.