Free Betting Calculators
Six fast, accurate tools for parlays, odds conversion, hedging and value bets. No signup, no ads, no nonsense — just the math.
Parlay Calculator
Combine multiple selections and see your total odds and potential payout. Supports up to 12 legs.
Open →Odds Calculator
Enter your stake and the odds, get your payout and profit instantly. American, decimal or fractional.
Open →Odds Converter
Switch between American, decimal, fractional and implied probability in one click.
Open →Hedge Calculator
Lock in profit or limit losses by hedging your live bet on the other side of the market.
Open →Hold Calculator
Measure the bookmaker's margin (vig) on any two-way or three-way market. Find the sharpest prices.
Open →Value Calculator
Compare your true probability against the bookmaker's price and see if a bet has positive expected value.
Open →Why use a betting calculator?
Every smart bettor — recreational or professional — runs the numbers before placing a wager. The price the sportsbook shows you and the actual probability behind that price are two very different things, and a betting calculator is the fastest way to close that gap. Our six free tools cover the calculations that come up most often: working out payouts, converting odds formats, building parlays, hedging live positions, measuring bookmaker margins and spotting value bets.
Which calculator do I need?
If you are placing a single bet
Use the Odds Calculator. Enter your stake and the odds in any format and you will instantly see the payout and net profit. This is the right tool for moneylines, spreads, totals and any straight wager.
If you are combining multiple bets into one ticket
Use the Parlay Calculator. American bettors call this a parlay, British and Irish bettors call it an accumulator or acca. Either way, every leg has to win for the ticket to cash, and the calculator multiplies the decimal odds of each leg to give you the total price.
If you are reading odds in different formats
Use the Odds Converter. American odds (+150, −200), decimal odds (2.50) and fractional odds (3/2) all describe the same payout in different languages. The converter also shows the implied probability — the percentage the sportsbook is effectively assigning to the outcome.
If you have a live bet and want to lock in profit
Use the Hedge Calculator. If your futures bet or live wager has moved in your favor, you can bet the other side at the current price to guarantee a return regardless of the final result. The calculator tells you exactly how much to stake on the hedge.
If you are comparing sportsbooks
Use the Hold Calculator. Hold (also called vig or juice) is the built-in margin every sportsbook adds to their prices. A 4% hold market gives you better expected value than a 7% hold market on the same game. Sharp bettors compare hold percentages before they bet.
If you are looking for an edge over the market
Use the Value Calculator. Enter the probability you think an outcome should have and the odds the sportsbook is offering. The calculator returns the expected value (EV) of the bet — a positive number means the bet has long-term value.
How accurate are these calculators?
The math behind every tool on this page is exact. Calculations run in your browser using standard formulas: parlays multiply decimal odds, conversions are direct algebraic transforms, hedges solve for equal-profit stakes, and hold is calculated from the sum of implied probabilities minus one. There is no rounding shortcut and no hidden margin baked in.