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Betting odds calculator: convert odds, find the vig
Enter odds in any format to convert them and read the probability they imply. Add the other side of the market to see the sportsbook's margin.
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1 Game time
Any format in, every format out
Type American (-110, +150), decimal (1.91) or fractional (10/11) odds. Add the odds on the other side of a two-way market to see the vig.
Other calculators: risk of ruin, Kelly, hedge and parlay.
2 The stat sheet
From price to probability
-110 becomes 1 + 100 ÷ 110 = 1.91. +150 becomes 1 + 150 ÷ 100 = 2.50. 10/11 becomes 1 + 10 ÷ 11 = 1.91.
Decimal odds Implied probability = 1 ÷ odds
On both sides of a market, the implied probabilities add up to more than 100%. The payout rate is 1 ÷ that total, and the vig is the gap to 100%. The betting odds guide goes through each step.
The implied probability is your break-even rate: win more often than that, or the bet loses money over time.
The turning point
A price is a threshold, volume does the rest
Our challenge math uses average odds of -110 (1.91): a 52.4% threshold. Beating it once proves nothing, and with no time limit at Prime Sports Funded, the volume builds at your pace.
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Frequently asked questions
How do you convert American odds to decimal?
Negative odds: 1 + 100 ÷ the number, so -110 becomes 1.91. Positive odds: 1 + the number ÷ 100, so +150 becomes 2.50.
What is the vig on a -110 / -110 market?
Both sides imply 52.4%, 104.8% in total. The payout rate is 1 ÷ 1.0476 = 95.5%, so the vig is 4.5%.
What are no-vig odds?
The odds with the margin removed: divide each side's implied probability by the total, then take 1 ÷ that probability. At -110 / -110, each side is 50%, or 2.00.
Final score
Read the odds, take the time
One step at +35%, no time limit.
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