Hold Percentage Calculator

This hold calculator measures a sportsbook’s theoretical edge on any market by summing the implied probabilities behind every American price, showing exactly how much of your money the house expects to keep across NFL, NBA, MLB, and NHL lines.

What Is Hold?

Hold is the theoretical edge a sportsbook builds into a market — the cut it expects to keep once the action on every outcome balances out. Every price carries an implied probability, and converting each outcome’s American odds into that probability and adding them together produces a total above 100%. That excess is the hold.

Take a standard two-way spread priced -110 on each side. Each -110 price implies a probability of 52.38%, and the two sides together sum to 104.76%. Subtract 100 and the book’s hold on that market is 4.76%, meaning the sportsbook expects to keep about $4.76 of every $100 wagered across both sides, assuming the action is split evenly.

Hold isn’t fixed across every market. Trim one side of that same -110/-110 line to -105 instead, and the market total drops to 103.6%, bringing the hold down to 3.6% — a gap that compounds over thousands of wagers.

Comparing hold across sportsbooks matters because a lower hold means a smaller built-in edge for the house, so more of your money survives long term. Sharp bettors shop the same market across books to find whoever prices tightest, since the lowest-hold book quietly offers the best odds of coming out ahead.

How Hold Is Calculated

The math behind hold is simple once every price is converted to the same unit: implied probability. Convert each outcome’s American odds to the probability the market implies for that side, add every outcome’s implied probability together, then subtract 100 from that sum. Whatever remains is the hold percentage.

Hold % = (sum of implied probabilities) − 100.

A two-way market, like a standard point spread or moneyline, adds exactly two prices. A three-way market — the kind used for soccer or hockey, where a draw is a live outcome — adds three instead. The more outcomes a market has, the more implied probabilities get summed, so hold has to be read on the same scale before comparing markets.

Applying this to the two-way example: both sides are priced -110, each implying 52.38%. Add them and you get 104.76%; subtract 100 and the hold is 4.76%. Shift one side to -105, and the implied sum falls to 103.6%, for a hold of 3.6%. As prices move closer to even money, the implied sum and the hold both shrink.

The larger the sum sits above 100%, the more the book holds. A sum of exactly 100% would mean zero hold — no built-in edge — which essentially never happens. Every real market carries some hold above zero, and the calculator’s job is to turn raw prices into that one comparable number.

What the Calculator Shows You

The calculator breaks a market down into its component parts so you can see exactly where the hold comes from. For every outcome you enter, it shows the American odds you supplied alongside that price’s implied probability — the percentage chance the market prices in for that side to win. It then shows the market total, every outcome’s implied probability added together, which reveals whether the book is pricing fair or padding its edge. Finally, it shows the hold percentage itself: the market total minus 100. Seeing all three figures together — individual implied probabilities, the summed total, and the final hold — lets you trace how each price contributes to the book’s overall edge, rather than being handed a final number with no way to check the work.

Worked Example

Consider a standard two-way spread priced -110 on each side, the most common number you’ll see on point spreads and totals across NFL and NBA markets. Side A is priced at -110, and Side B is also priced at -110.

Converting each price to its implied probability, Side A’s -110 works out to 52.38%. Side B’s -110 also works out to 52.38%, since both sides carry identical odds. Add those two implied probabilities together and the market total comes to 104.76%.

To find the hold, subtract 100 from that market total: 104.76% minus 100 leaves 4.76%. That 4.76% is the book’s theoretical hold on this market, meaning it expects to keep roughly $4.76 out of every $100 bet across both sides combined, provided the action is balanced.

Now compare what happens if the book shades the price on one side. Trim Side B from -110 to -105, and the market total falls from 104.76% to 103.6%. Subtract 100 from that new total and the hold drops from 4.76% down to 3.6% — a gap that sounds minor on one market, but multiplied across thousands of bets over a season becomes a meaningful swing in how much of your bankroll survives.

This is the core value of the calculator: it doesn’t just tell you what a single bet pays out, it tells you how much theoretical edge is baked into the market before you place a wager, so you can judge whether a book’s prices are tight or padded.

Two-Way Hold by Price Pairing

Hold moves with the prices themselves, and a two-way market can carry very different hold depending on how the two sides are priced. The table below lines up four common price pairings against the implied probability they sum to and the resulting hold. As prices move closer to even money on both sides, the implied sum drops and the hold shrinks with it, while a deeper price like -120 paired with plus money still carries more hold than a pairing closer to pick’em.

Hold on a Three-Way Market (+120 / +220 / +260)

Three-way markets work the same way, just with one more outcome to add in. This table shows a market priced +120 on the home side, +220 on the draw, and +260 on the away side, along with the implied probability each American price represents on its own.

Theoretical Hold vs. Realized Hold

Hold is a market-level figure, not a per-bet fee charged to your wager. The book only collects the full theoretical hold if betting is perfectly balanced across every outcome, which almost never happens. A sportsbook manages exposure by moving lines as money comes in on one side or another, so the hold it actually realizes drifts away from the theoretical number the prices imply at any single moment.

The math also scales with how many outcomes a market has. A three-way market — the home, draw, and away structure used in soccer or hockey — sums three implied probabilities instead of two, so the +120/+220/+260 example above totals 104.48% for a 4.48% hold. That’s a different scale than a two-way market, so a two-way hold can’t be compared directly against a three-way hold as if they sat on the same baseline; the more outcomes involved, the more the raw sum stretches above 100%.

Some markets carry far more hold than a standard game line. Long-shot-heavy markets like a futures book, where dozens of outcomes are priced with little chance of landing, can hold 20% or more. And because a parlay strings legs together, each leg’s hold compounds across the ticket, so a book’s real edge on a parlay ends up far higher than on any single leg — the quiet reason parlays are so profitable for the house.

When Hold Makes Sense

Checking hold matters most when you’re deciding where to place a bet, not after the fact. Since hold represents the book’s built-in theoretical edge, the lower it is on a given market, the more of your wagered money has a chance to come back over time. That makes hold a tool for comparison rather than a warning sign to avoid betting altogether — every book holds something, so the question is never whether hold exists but how much of it you’re accepting.

For volume bettors placing many wagers a season, shopping for the lowest hold is one of the most reliable ways to improve long-run results without changing how you pick winners. A market priced -105/-105 carries meaningfully less hold than the same market priced -110/-110, and that gap compounds across a large sample of bets. If you bet infrequently, the difference matters less in dollars, but it still costs nothing to check.

Hold is less useful as a signal on any single bet in isolation, since the theoretical figure assumes balanced action a real book may never see. It’s most valuable as a comparison tool: pull the same market up across a few sportsbooks, run each through the calculator, and take the side with the lowest hold when the pick itself is a coin flip. Where hold matters least is on markets you’d bet regardless of price, like a strong opinion on a specific side — there, the pick matters more than the margin.

Common Mistakes

A common mistake is treating hold as a flat fee subtracted from your bet rather than an edge built into the whole market. Another is adding up only the favorite’s side and forgetting every other outcome in the sum. Bettors also compare a two-way hold directly against a three-way hold as if the two sat on the same scale, when a three-way market naturally sums more implied probability. Finally, it’s easy to overlook how much parlay hold compounds, since each leg carries its own hold and those combine across the full ticket rather than staying flat.

Low-Hold Book vs. High-Hold Book

The gap between a tight-pricing book and a padded one shows up clearly when the same market is lined up side by side. A book pricing -105/-105 holds far less than one pricing -120/-120, and that difference in cost adds up fastest for anyone betting in volume.