A key number is a margin of victory that NFL games land on far more often than chance would suggest — and crossing one changes the value of a spread more than any public lean does.
NFL scoring comes in threes and sevens, so games end by exactly three or exactly seven points far more often than by two, four or five. Across decades of results roughly one game in seven finishes with a three-point margin and nearly one in ten with a seven-point margin; the next most common numbers — 6, 10, 4 and 14 — trail well behind. A spread that sits on 3 or 7 will be decided by a push far more often than one that sits on 2 or 5.
That is why the market resists moving a line across 3 or 7. A book would rather shade the price — -3 at -120 instead of -3.5 at -110 — than give the underdog a half-point through the most common margin in the sport.
Half-points are not all equal. Moving from -2.5 to -3 costs a bet on the favorite every game that ends by exactly three, which is the single most common outcome; moving from -4.5 to -5 costs it almost nothing. Bettors who shop for numbers care about the key ones for exactly this reason, and the difference between getting +3 and +2.5 on an underdog is often larger than any edge a split suggests.
Public betting percentages and key numbers interact in one specific way: a line that sits on a key number is a line the book is reluctant to move, so a lopsided ticket count may show up as a price change rather than a spread change. When 75% of tickets are on the favorite at -3 and the number holds while the price drifts, the book is absorbing the lean without crossing the three. When the number does cross a key number against the majority of tickets, that is the strongest form of reverse line movement in the sport.
Our NFL game pages show the spread alongside its split at the latest snapshot, and the subscriber page tracks how each line moved from open to close so the crossings are visible.
Every MLB game on the slate, ranked by how far the public and the money diverge — the exact gap this page is about, applied live.
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These are data displays. We don't issue picks. Use the splits to inform your own bets — and bet responsibly.
Look for 15+ point gaps where the money is on the unpopular side. Those are the games where the average bet size is doing the talking.
Public favorites still win plenty of games — they are usually the better team. Where the public underperforms is against the spread on big-name teams in nationally televised games.
The run line is MLB's standard spread — almost always set at 1.5 runs. The favorite gives 1.5; the underdog gets 1.5.
This page defines key number as we use it across the site. See how we track public bets and money →
Last updated: September 15, 2026 at 2:51 AM UTC
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