Implied probability calculator
Convert odds into a price-implied percentage. Optionally enter the opposite side of a two-outcome market to inspect its overround.
Your calculation
A worked example
At −110, each side implies about 52.38%. Two opposing −110 prices total about 104.76%, an overround of 4.76 percentage points. Proportionally normalizing those two prices produces 50% for each side; this adjustment is not proof of the true probabilities.
The math
Implied probability = 100 ÷ decimal odds. Two-outcome overround = first implied % + opposite implied % − 100. Normalized first side = first implied % ÷ sum of both implied % × 100.
Common questions
Does a 60% implied probability mean a 60% win chance?
No. It is a probability derived from the quoted price. Margin, market conditions and pricing choices can separate it from the actual outcome probability.
Can I use the optional field for a three-way soccer market?
No. Leaving out the draw produces an incomplete total. This version only normalizes a complete two-outcome market.
What does negative overround mean?
The two entered implied probabilities add to less than 100%. That could reflect mismatched markets, stale prices or other conditions. The arithmetic alone does not establish an executable or risk-free opportunity.
Put the numbers in context.
Explore the research and talk through the game with CashCord.
Keep the conversation going.
Share this page with someone who wants to understand the reasoning. To include your calculator inputs, use Copy result link above.