Betting Odds Calculator & Gambling Odds Calculator & Vig Calculator

1. Payout on a $100 bet at -110

Bet amount: $100. American odds: -110 (decimal 1.909). Total return: $190.91. Potential profit: $90.91.

Formula: stake × decimal odds. Every standard NFL or NBA point spread pays roughly this price.

2. Convert +250 to decimal and fractional

+250 American equals 3.50 decimal and 5/2 fractional. Implied probability: 28.6%.

Underdog pricing like this is common on moneyline futures and prop markets.

3. Vig calculator (decimal) on -110 / -110

Two -110 sides equal decimal 1.909 each. Combined implied probability: 104.76%. Vig percentage: 4.76%. Hold: 4.54%.

That 4.76% is the house edge baked into a standard two-way market.

4. Calculate the implied probability of +200

+200 decimal is 3.00. Implied probability = 1 / 3.00 = 33.3%.

If your model says the true probability is above 33.3%, the bet has positive expected value (+EV).

Implied probability

Implied probability is the odds translated into a percentage chance. To calculate it, divide 1 by the decimal odds — so 2.00 decimal equals 50% implied. Standard -110 odds imply a 52.4% chance, but each side of a two-way market adds up to more than 100% because the book bakes in a margin on both sides. That overround is the vig. Tracking implied probability helps you compare what the book says an outcome costs versus what your own model says it is actually worth.

Vig percentage & hold

Vig (also called juice or margin) is how much the sportsbook charges on a market. The vig percentage is the amount the two sides' implied probabilities exceed 100%. Hold is the same concept expressed as a share of total stake. Sharp books run lower vig.

Bet amount, payout, and total return

Your bet amount is what you risk. Total return is stake × decimal odds — everything you collect on a winner, sometimes called the potential payout. Potential profit is total return minus stake. The calculator shows all three based on the odds you enter. Compare bets on the same scale.

Point spread pricing

A point spread is the margin of victory one team has to cover. The two sides of a spread are usually priced around -110 each on US retail sportsbooks, creating a combined implied probability of 104.8% and a 4.8% vig. Sharp books like Pinnacle regularly price spreads at -105/-105 or tighter. Knowing the exact vig on a spread lets you compare true cost across books and spot when one is offering better price than the market consensus.

No-vig fair odds

No-vig (or "fair") odds strip the sportsbook margin out of the price to show what each side is truly worth. The No-Vig tab above uses the proportional method: it rescales the two implied probabilities to sum to 100%, then converts back to odds. This gives you the fair mid-point price. Sharp bettors use no-vig odds to measure closing line value (CLV) — if you beat the no-vig closing price, your process is profitable regardless of whether the bet won.

+EV (positive expected value)

A bet is +EV when the sportsbook is paying more than the true probability. Compare the sportsbook odds to a sharp no-vig reference like Pinnacle. If the book's implied probability is lower than the fair probability, it's a +EV spot. This is the core edge most profitable sports bettors chase long-term.

American Odds

Shown as positive (+150) or negative (-110) numbers. Negative odds show how much to bet to win $100. Positive odds show how much you win on a $100 bet.

Decimal Odds

Multiply by your stake to get total payout (including stake). Always greater than 1.0. Popular in Europe, Australia, and Canada.

Fractional Odds

Shown as a fraction (5/1, 10/11). The numerator is profit per unit of stake (denominator). Common in UK horse racing and football.