Moneyline Odds Calculator

Translate American moneyline prices into decimal, fractional and probability terms.

Please enter valid odds
Please enter a valid stake amount
Results
Risk --
To Win --
Total Payout --
Decimal Odds --
Fractional Odds --
Implied Probability --

How to Use This Calculator

  1. Input the American moneyline odds (e.g., -150 or +220)
  2. Specify whether the figure you enter is the amount risked or the amount to win
  3. Input the dollar amount
  4. Read the risk, to-win, total payout, and format conversions

Formula

Negative moneyline (favourite, e.g., -150): To-win = Risk × (100 / |odds|)

Positive moneyline (underdog, e.g., +220): To-win = Risk × (odds / 100)

Decimal Odds = (|odds| + 100) / 100 if positive, (100 / |odds|) + 1 if negative.

Implied Probability = 1 / Decimal Odds.

Frequently Asked Questions

How does a moneyline bet work?

A moneyline bet backs the outright winner of an event, with no spread or handicap applied — you simply select the team or player to win. American moneyline odds quantify the stake needed to win $100 (favourite) or the profit returned on a $100 stake (underdog).

How do you read -150?

A negative number marks the favourite. -150 requires a $150 stake to win $100, equivalent to $1.50 risked per $1 of target profit. That maps to an implied probability of roughly 60%.

How do you read +220?

A positive number marks the underdog. +220 returns $220 of profit on a $100 stake, for a total payout of $320. The implied probability is about 31%.

What is the formula to convert moneyline to decimal odds?

Positive odds: divide by 100 and add 1, so +150 = 2.50 decimal. Negative odds: divide 100 by the absolute value and add 1, so -150 = (100/150) + 1 = 1.667.