Free tool
Halftime calculator.
Three numbers tell you how far a sportsbook has moved at halftime: the pregame total, the points already scored, and the new second-half line. Load a live game below, or type your own.
Or type your own numbers.
Live games and DraftKings' live totals come from ESPN's public scoreboards. When a game is at halftime, the second-half line is the live game total minus the points already scored.
How to read the result
The updated full-game total is the points already scored plus the second-half line. It's what the book now expects the whole game to produce. The difference between that and the pregame total is how much of the first half the book believes will carry over.
A small move means the book thinks the first half was mostly noise: a hot shooting stretch, a defensive touchdown, a fluky turnover. A big move means it thinks the pace was real. Neither is automatically right. The question every second-half bettor is asking is whether the move was too big or too small for this game.
Example: a college basketball game opens at 160. It's 30–30 at the half, 60 points, and the second-half line is 75. The book now expects 135, 25 points below where it opened. That's the default example loaded above.
Juice changes your break-even
Halftime markets often carry more juice than pregame lines, and that raises the share of bets you need to win just to break even.
| Price | Win rate needed to break even |
|---|---|
| −105 | 51.2% |
| −110 | 52.4% |
| −115 | 53.5% |
| −120 | 54.5% |
| −125 | 55.6% |
What the calculator can't tell you
It shows how far the book moved, not whether the move was right. That depends on the sport and the game: who's hurt, how the points were scored, whether a blowout means backups, what the weather is doing, and whether overtime is in play. The sport guides cover each one:
- NFL halftime betting: game script, quarterback news, weather and key numbers.
- College football second halves: talent gaps, backups, tempo and overtime.
- NBA second-half totals: pace, rotations and late-game fouling.
- College basketball second halves: 20-minute halves, fouls and free throws.
- The complete second-half betting guide.
The halftime board
This, for every game, automatically.
HalfSharp runs this math on every game at the half, fills in the line for you, and says bet or pass with the historical record behind the call. Every call goes on the public record, losses included.
Get the boardFree halftime notes by email
FAQ
Calculator questions.
Where does the live second-half line come from?
When a game is at halftime, the calculator reads DraftKings' live full-game total from ESPN and subtracts the points already scored. That gives the second-half number. Your book's line may differ by a half-point or more; type yours in to compare.
Why is there no second-half line for finished games?
Books take second-half lines down when the second half starts, and the feed doesn't keep them. For a finished game the calculator starts from the pregame total minus the first half and shows what the second half actually scored, so you can see how a typical number would have done.
Does overtime count?
At most US sportsbooks, second-half bets include overtime. Check your book's house rules.
Is the live game total the same as the second-half total?
No. The live total covers the whole game. The second-half total is the live total minus the points already scored, and most apps list it under a "Halves" or "2nd Half" tab.
Is this betting advice?
No. It's a free tool that does the arithmetic. It doesn't tell you to bet, and no method guarantees results. For adults 21+ where sports betting is legal. Gambling problem? Call 1-800-GAMBLER.