Find the sharpest line
on every bet you place.
Linewhale compares odds in real time across major US sportsbooks so you stop leaving money on the table.
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Convert between American, decimal, fractional, and implied probability
Calculate combined payout for any number of parlay legs
Find the optimal hedge bet to lock in guaranteed profit
Find the optimal stake split and guaranteed profit for any 2-way arb
Frequently asked questions
What is Linewhale?▾
Linewhale is a free sports betting odds comparison site. We pull real-time moneyline, spread, and totals from every major US sportsbook — DraftKings, FanDuel, BetMGM, Caesars, and more — and display them side by side so you always find the best available price.
Which sportsbooks does Linewhale compare?▾
We compare all major licensed US sportsbooks including DraftKings, FanDuel, BetMGM, Caesars, PointsBet, BetRivers, and others. Odds are updated every minute so the lines you see are current.
Which sports does Linewhale cover?▾
We currently cover NFL, NCAAF, NBA, NCAAB, MLB, NHL, MMA, MLS, and the English Premier League, with more sports being added. All coverage is US-market focused.
Is Linewhale free to use?▾
Yes — odds comparison, the events feed, and the free calculators (Odds Converter, Parlay Calculator, Hedging Calculator) are completely free. Premium members also get access to the Arbitrage Finder and Positive EV Finder.
What is line shopping and why does it matter?▾
Line shopping means checking multiple sportsbooks to find the best available odds before placing a bet. Even a small difference — like +105 vs +100 on a moneyline — compounds significantly over hundreds of bets. Linewhale makes line shopping instant by showing every book's price in one place.