Odds & Conversion Betting Tools
Moneyline Betting Tool
Convert American moneyline prices into decimal, fractional and probability terms.
Implied Probability Betting Tool
Reveal the true probability implied by bookmaker odds across one or more outcomes.
No-Vig Betting Tool
Remove the bookmaker's margin to establish fair, vig-free prices and probabilities.
Odds Betting Tool
Enter a price in any format to read every equivalent at once.
Odds Conversion Betting Tool
Convert between decimal, fractional and American odds and read the implied probability.
Point Spread Betting Tool
Translate point spreads into moneylines and implied probabilities.
Every quoted price is a probability dressed in another format, and converting between them is the first discipline of a sharp bettor.
Reading the price
Decimal odds of 3.00 imply a 33.3% chance; rate the outcome higher and you have found value. Bookmakers build in a margin — two sides at 1.91 imply 52.4% apiece, or 104.8% combined, and that surplus is their edge. These tools convert any format and expose the no-vig price so you always compare fairly.
Frequently Asked Questions
What are the different odds formats?
There are three main odds formats used worldwide. Decimal odds (e.g. 2.50) are popular in Europe and Australia — they show the total payout per unit staked. Fractional odds (e.g. 6/4) are traditional in the UK and Ireland — they show net profit relative to stake. American odds (e.g. +150 or -200) are standard in the US — positive numbers show profit on a $100 bet, negative numbers show how much you need to stake to win $100.
How do I convert between odds formats?
Use our Betting Odds Calculator for instant conversions. The formulas are: Decimal = Fractional + 1; for positive American odds, Decimal = (American / 100) + 1; for negative American odds, Decimal = (100 / |American|) + 1. Our calculator handles all conversions automatically in both directions.
What is implied probability?
Implied probability is the likelihood of an outcome as suggested by the odds. For example, decimal odds of 2.00 imply a 50% chance (1 / 2.00 = 0.50). Bookmakers build a margin into their odds, so the implied probabilities for all outcomes in a market will add up to more than 100%. The amount over 100% represents the bookmaker’s edge.
What is a bookmaker margin (overround)?
The bookmaker margin, also called overround or vig, is the built-in profit the bookmaker earns regardless of the outcome. If two outcomes in a market have implied probabilities of 52.4% each, the total is 104.8% — the 4.8% over 100% is the margin. Lower margins mean better value for bettors. Our No-Vig Calculator strips out this margin to show the true fair odds.
How do I remove the vig from odds?
To remove the vig (bookmaker margin), divide each outcome’s implied probability by the total of all implied probabilities, then convert back to odds. For example, if a two-outcome market has implied probabilities of 54.5% and 50.5% (total 105%), the true probabilities are 51.9% and 48.1%. Our No-Vig Calculator does this automatically for markets with any number of outcomes.
Why do odds matter for betting strategy?
Understanding odds is fundamental to profitable betting. Odds determine your potential return, the implied probability lets you compare the bookmaker’s assessment to your own, and finding discrepancies — where you believe the true probability is higher than what the odds suggest — is the basis of value betting. Without understanding odds, you cannot evaluate whether a bet offers good value.