About Linewhale
Linewhale is a sports betting odds comparison site built for bettors who want an edge. We pull real-time lines from every major US sportsbook — DraftKings, FanDuel, BetMGM, Caesars, and more — and surface them side by side so you always know where to get the best number before you place your bet.
What we do
Every minute our system fetches updated moneyline, spread, and totals odds for NFL, NCAAF, NBA, NCAAB, MLB, NHL, MMA, MLS, and EPL events. We highlight the best available price in green so you can spot it instantly. We don't take bets — we just help you find where to place yours.
Free tools
Alongside live odds we offer a suite of free betting calculators:
- Odds Converter — convert between American, decimal, fractional, and implied probability
- Parlay Calculator — calculate combined payout for any number of legs
- Hedging Calculator — find the optimal hedge bet to lock in guaranteed profit
Premium tools
Premium members get access to advanced tools built for serious bettors:
- Arbitrage Finder — live opportunities where covering all outcomes across books locks in guaranteed profit
- Positive EV Finder — bets where a book's offered odds exceed the consensus fair probability, giving you a long-term mathematical edge
Independence
Linewhale is independently owned and operated. We may earn a commission when you sign up for a sportsbook through one of our links — this never influences which lines we show or how we highlight the best odds.
Responsible gambling
Sports betting should be fun. If gambling is affecting your life negatively, free confidential help is available 24/7 at the National Problem Gambling Helpline (1-800-522-4700). Must be 21+ to bet where applicable.