Free sportsbook comparisons, sports betting tools, & more

We research and review sportsbooks, create free tools, and help you compare odds so you can make the most educated sports bets possible.

BEST Sportsbooks of 2021

Caesars Sportsbook Logo

#1 Sportsbook


Bonus: Risk-free bet up to $5,000

Draftkings Sportsbook review

#2 Sportsbook


Bonus: 20% deposit match up to $5,000

fanduel sportsbook logo

#3 Sportsbook


Bonus: Risk-free bet up to $1,000

BetMGM review

#4 Sportsbook


Bonus: Risk-free bet up to  $1,000

twinspires logo

#5 Sportsbook


Bonus: Risk-free bet up to  $1,000

Sports Betting Calculators

Betting Odds Calculator

Calculate the payout on your bet, convert between odds formats, & see the implied probability

Parlay Calculator

Calculate the payout on your parlay based on the odds of each leg. Works with all odds formats

Hedge Bet Calculator

See the hedge amount that guarantees you the most profit based on your original bet & the hedge odds

Odds Converter

Convert between the three betting odds formats (American, Decimal, & Fractional)

Sports Betting Legality by State

Check if sports betting is legal in your state & navigate to our state-specific sports betting guides


Join the Odds Assist Newsletter

Stay up-to-date on the latest sports betting news and get alerted when sportsbooks offer new odds boosts & promotions

Learn about sports betting

We have a number of sports betting resources to help you learn about how sports betting works, how to increase your chances of winning, and more. Here are some of our top picks:

Types of Sports Bets

Point Spread Betting Guide

How to Read Betting Odds

Sports Betting Glossary

Free Bets & Betting Offers at Sportsbooks

Best NFL Betting Sites

Best College Football Betting Sites

Online Sportsbooks With the Fastest Payouts


We created Odds Assist to help bettors make better decisions when it comes to wagering on sports. We collect hundreds of data points on sportsbooks so you can be sure you are wagering your money with the best options available. We have in-depth sportsbook reviews, detailed state betting guides, free tools and calculators, and much more to help you along your sports betting journey.