Free tool
Betting Odds Calculator
Payout, profit, implied probability · singles and parlays
Enter a price and a stake. You get the return, the profit, the implied probability, and the same price written in every other format.
Parlay
Add a price per leg. A parlay multiplies the decimal odds together, which is also why it multiplies the bookmaker’s margin: each leg carries its own cut.
The number this calculator cannot give you
A payout tells you what a price pays. It does not tell you whether the price is fair — for that you have to remove the bookmaker's margin. We publish that figure for every football match on the board today, already worked out.
Free tier covers a fifth of each day’s matches, mixed across major and minor competitions. No card needed.
How a payout is worked out
In decimal odds the sum is one line: stake × odds = total return. A €100 stake at 2.50 returns €250, of which €150 is profit and €100 is your own money back.
American odds say the same thing in two halves. A positive price is the profit on a 100 stake: +150 means 150 profit on 100. A negative price is the stake needed to profit 100: -200 means you risk 200 to make 100.
Fractional odds are profit over stake. 3/2 is three units of profit for every two staked, which is 2.50 in decimal.
What the price is actually claiming
Divide 1 by a decimal price and you get a percentage: 2.50 is 40%. That is the chance the market is quoting — but it is quoted with a fee inside it. Add up every outcome in a market and the total comes to more than 100%. The surplus is the bookmaker’s margin.
The no-vig calculator takes that fee out and leaves a set of percentages that add up to exactly 100.
Parlays multiply the fee, not just the odds
A parlay multiplies the decimal odds of every leg, so the price grows fast. The margin compounds with it: four legs at 4.8% margin each leave roughly 17% of the combined stake with the house, not 4.8%. The calculator above shows the combined margin separately for exactly that reason.
Questions
How do I calculate a betting payout?
Multiply your stake by the decimal odds to get the total return, then subtract the stake to get the profit. A 100 stake at 2.50 returns 250, of which 150 is profit.
What does +150 mean in betting?
A positive American price is the profit on a 100 stake. +150 returns 150 profit plus the 100 stake, a total of 250, which is 2.50 in decimal odds.
What does -200 mean in betting?
A negative American price is the stake needed to profit 100. -200 means risking 200 to make 100, a total return of 300, which is 1.50 in decimal odds.
How are parlay odds calculated?
Multiply the decimal odds of every leg together. Three legs at 2.00 give 2.00 x 2.00 x 2.00 = 8.00. The bookmaker's margin compounds the same way, so a parlay carries far more of it than a single bet.
Does this calculator tell me what to bet?
No. It converts prices and works out returns. It is arithmetic, not a prediction, a tip or a recommendation.