Free betting calculators from PropsBot.AI. Convert odds to implied probability, calculate parlay payouts, find vig and hold, compute expected value, strip the vig to find fair odds, hedge a winning bet, optimize bet sizing with the Kelly Criterion, and check the value of any same-game parlay. Eight free tools — no signup required, mobile-friendly, built for sharp prop bettors.
All Tools
- Implied Probability Calculator — convert American, decimal, or fractional odds to win probability
- Parlay Calculator — combine multiple bets, see total payout, profit, and combined odds
- Hold & Vig Calculator — compute the sportsbook’s margin from a 2-way market
- Expected Value (EV) Calculator — find +EV bets by comparing your true probability to the book’s price
- No-Vig Fair Odds Calculator — strip the vig to see what each side would price at with zero margin
- Hedge Calculator — lock in profit on a winning bet by hedging the opposite outcome
- Kelly Criterion Calculator — mathematically optimal bet sizing for long-term bankroll growth
- SGP Value Calculator — check whether your sportsbook’s same-game parlay price is fair value
Why use PropsBot’s tools?
Every tool on this page is built for sports prop bettors who want to evaluate lines, build parlays, and identify edges. They’re free, fast, mobile-friendly, and built with the same data PropsBot’s AI uses to score props every day. When you’re ready to see AI Confidence Scores on every player prop, head to the PropsBot app.
The complete pre-bet workflow
Use these eight calculators together as a complete pre-bet evaluation system:
- Convert the line you’re considering into implied probability with the Implied Probability Calculator.
- Strip the vig with the No-Vig Fair Odds Calculator to see the “true” probability the market is implying.
- Compare the no-vig probability to your own model. If yours is higher, you’ve found +EV.
- Quantify the edge with the EV Calculator to see expected dollar profit per bet.
- Size the bet with the Kelly Criterion Calculator for optimal bankroll growth.
- Check the book’s hold with the Hold/Vig Calculator to confirm you’re not paying excessive margin.
- Build a parlay if combining multiple +EV bets, using the Parlay Calculator for traditional parlays or the SGP Value Calculator for same-game parlays.
- Hedge a winning futures or live bet with the Hedge Calculator to lock in profit.
More from PropsBot
- Best Props Today — AI-scored player props across all sports
- Positive EV Props — props where PropsBot’s confidence beats book implied probability
- AI Sports Picks — How It Works
- What is a Confidence Score?
- What is an Edge Score?
