Point Spread Betting Tool
Translate point spreads into moneylines and implied probabilities.
How to Use This Calculator
- Enter the point spread (for example, -3.5 for a 3.5-point favorite)
- Enter the juice/vig (the default is -110)
- Review the implied win probability and the 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
What does a point spread mean?
A point spread is a handicap placed on the favoured team to level the betting. A team listed at -3.5 must win by 4 or more points for the wager to succeed. The underdog at +3.5 wins if it triumphs outright or loses by 3 points or fewer.
How is a spread translated into a moneyline?
Each point of spread corresponds roughly to 2.75% of win probability. A -3.5 spread implies a win probability of approximately 59.6%, which works out to a moneyline near -148 for the favorite.
What do juice and vig mean?
Juice, also called vig, is the commission levied by the sportsbook. The standard is -110 on each side, meaning you must wager $110 to win $100. This embedded margin is what secures the sportsbook a profit regardless of the result.
Is this conversion precise?
The spread-to-moneyline conversion is an approximation. The exact relationship hinges on the sport, the particular matchup, and prevailing market conditions. It serves best as a quick reference for NFL and NBA betting.