Half-Point Calculator

What the half point costs—

Give both lines and their prices and this becomes the win probability the move actually buys.

Line you haveBase line — your sideBase line — other side

Line you wantMoved line — your sideMoved line — other side

The number this move crosses

Reading the counted archive…

Devigged win prob — base line50.00%

Devigged win prob — moved line52.54%

The shift above is what the market says the move is worth. The ladder above it is what the games did. They are two different measurements and this page will never set them equal — a landing frequency is not a price. Hold them side by side and decide for yourself whether the book is charging enough.

Show the math

shift = p_fair(moved) − p_fair(base)52.54% − 50.00% = +2.54 pts

Send this calculation

Your numbers travel in the link — whoever opens it sees this exact calculation.

KeyboardUp and down arrows step any price — 5 cents on an American number, a hundredth on a decimal. Enter moves to the next field. Slash jumps back to the first one from anywhere on the page.

What this will not claimThe market's charge for the move and the counted frequency of that margin are two different measurements. This page shows both and will never set them equal.

Related calculators

No-Vig Fair Odds CalculatorStrip the book's margin from a two-sided market — three devig methods side by side.Alternate Line CalculatorDerive fair prices for every alternate line from the main market's devigged number.Teaser CalculatorThe break-even per-leg win rate your teased legs must clear at the payout you're quoted.All 13 calculators →

What is a half point worth in betting?

A half point is worth exactly what the market charges for it: devig both lines and the difference in fair win probability is the hook's market price — no push charts or invented key-number rates required.

How it works & common questions

The same method prices buying the hook, selling it, or comparing a book's alternate line against the main market — it is the market-implied answer, which is the only honest one available without empirical push data.

How it works

Enter the base line's two prices. Your side and the other side at the current number.
Enter the moved line's two prices. The same market a half point up or down.
Read the shift. Fair win probability at each line — the difference is what the half point is worth.

Is buying a half point ever worth it?

Only when the price charged is smaller than the market-implied probability gain — which mostly happens around football's key numbers 3 and 7, where a half point crosses real mass. Devigging both lines, as this calculator does, tells you what the market itself thinks the hook is worth.

Dynatyze Betting is analytics and education for people 21 and over. It is not a sportsbook: no wager is ever placed on Dynatyze — the tools help you find and price the best available bet elsewhere. If gambling stops being fun, help is free and confidential at 1-800-GAMBLER.