Free developer tool
Pinnacle no-vig calculator
Remove the margin proportionally from a complete set of Pinnacle decimal odds. See the overround, normalized probabilities and fair prices.
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Proportional normalization
overround for two prices of 1.91
- Outcome 1
- 50.00% · 2.00
- Outcome 2
- 50.00% · 2.00
Normalized probabilities and decimal prices. This model does not establish true probabilities.
One explicit modeling assumption
Use at least two mutually exclusive, exhaustive outcomes. For each decimal price dᵢ, calculate qᵢ = 1 ÷ dᵢ. Let S = Σqᵢ. The overround is S − 1. Proportional normalized probability pᵢ = qᵢ ÷ S, and normalized decimal price is 1 ÷ pᵢ.
With two prices of 1.91, each implied probability is approximately 52.36%. Their sum is approximately 104.71%, for an overround of 4.71%. Proportional normalization yields 50% and decimal 2.00 for each outcome.
Do not mistake a model for truth
This assumes the margin is distributed proportionally. Other models can produce different results, especially for uneven prices. A sum below 100% is an underround and is flagged without changing your inputs. Market completeness, timestamps, source alignment, and suspended prices must be checked separately.
The interface accepts up to 12 outcomes and displays percentages and normalized decimal odds rounded to two decimal places. Rounded percentages may not sum to exactly 100%. It is a mathematical inspection tool, not evidence of a profitable opportunity.
To turn a fair price into a stake, the EV calculator on pnclDATA takes the same decimal prices and adds expected value and a Kelly fraction.
Normalize data before comparing markets · Convert individual odds