Calculators
The fair price behind the quote—
Give both sides of a market and this becomes the price with the book's margin taken out.
Devig method
Multiplicative splits the vig in proportion to each side's raw probability — the default, and the one the +EV board grades against.
Side A · fair−180
64.3%from 66.7% raw
Side B · fair+180
35.7%from 37.0% raw
Hold on this market3.6%
Raw book sum103.7%
| Method | Fair pair | Side A | Deviation | Δ pts |
|---|---|---|---|---|
| Multiplicative | −180 / +180 | 64.3% | base | |
| Additive | −184 / +184 | 64.8% | +0.5 | |
| Power | −186 / +186 | 65.1% | +0.8 |
Widest disagreement0.80 pts
Shin is not listed on a two-way book because it is not a fourth answer there: its inversion collapses algebraically onto the additive result, so the column would be a copy of one already on screen. On a three-way market it separates, and it is listed.
Show the math
proportional: fairᵢ = pᵢ / ΣpΣp = 1.0370
additive: fairᵢ = pᵢ − (Σp − 1)/n
power: fairᵢ = pᵢ^(1/k), k solved so Σfair = 1