# Sportsbook margin calculator: how much does the bookmaker keep? > Free sportsbook margin calculator for Dutch bettors: enter decimal odds to see the overround, what the bookmaker keeps, the fair odds and which of two sportsbooks pays more. - URL: https://safebet.ai/nl/sports-betting/margin-calculator/ - Markdown version: https://safebet.ai/nl/sports-betting/margin-calculator/index.html.md - Last updated: 2026-10-23 - Publisher: SafeBet.ai - Editorial policy and advertiser disclosure: https://safebet.ai/editorial-policy/ Netherlands · Sports betting · Free tool Enter a sportsbook’s odds on every outcome of a market to see how much it keeps, the fair odds with its margin removed, and, with a second sportsbook’s odds, which pays more on each outcome. By [SafeBet.ai Research Team](https://safebet.ai/editorial-policy/) Updated October 23, 2026 ## How the calculator works A sportsbook never offers fair odds. Add up the implied probabilities of every outcome in a market and you get more than 100%: the excess is the **overround**, and it’s how the sportsbook makes money whoever wins. At 1.90 on both sides of a two-way market, each side implies 52.6%, together 105.3%, and the sportsbook keeps about 5% of everything staked on that market over time. Enter the odds a sportsbook offers on each outcome, in decimal, fractional or American format, and the calculator shows how much it keeps, the share it pays back, and the fair odds with the margin removed. Add a second sportsbook’s odds on the same match to see which keeps less, and which pays more on each outcome. In the Netherlands the gambling tax is paid by the licensed operator, not taken from your bets, so the odds you see are what you get. ## Typical margins What a sportsbook keeps at common prices, computed with the same formula as the calculator. | Market and prices | Overround | Sportsbook keeps | Pays back | | ----------------------------------- | --------- | ---------------- | --------- | | Two-way market at 1.90 and 1.90 | 5.26% | 5.00% | 95.00% | | Two-way market at 1.85 and 1.95 | 5.34% | 5.07% | 94.93% | | Two-way market at 1.80 and 2.00 | 5.56% | 5.26% | 94.74% | | Football 1X2 at 2.10, 3.40 and 3.50 | 5.60% | 5.31% | 94.69% | | Football 1X2 at 2.25, 3.40 and 3.10 | 6.11% | 5.76% | 94.24% | [**Compare the 5 best sports betting sites in the Netherlands** Ranked on regulation, fees, features and payouts · BetMGM, TOTO, Circus and more See the ranking](https://safebet.ai/nl/sports-betting/) ## Frequently asked questions ### What is the overround? The amount by which a sportsbook’s implied probabilities add up to more than 100%. At 1.90 on both sides of a two-way market, each side implies 52.6%, together 105.3%, and the sportsbook keeps about 5% of everything staked on that market over time. ### How is what the sportsbook keeps calculated? Hold = 1 − 1 ÷ (sum of the implied probabilities), which is what the sportsbook keeps if bets follow the fair probabilities. The payout rate is the rest. The calculator removes the margin proportionally to get the fair odds. ### Does a lower margin mean I will win? No. It means you lose less on average. Even at a low margin, a bettor who picks at random loses part of everything staked over time. ## Keep reading [Methodology · 4 min **How we rank betting sites in the Netherlands** We only rank sportsbooks licensed by the Kansspelautoriteit (Ksa), on the websites its Kansspelwijzer lists. Each is scored from 0 to 10 on six weighted criteria, licensing and safety, markets and features, odds and limits, payments and payouts, app and experience, and support and responsible gambling, and the ranking follows the overall scores. Fines, binding instructions and warnings from the Ksa lower the licensing score; we judge odds on what each bookmaker publishes, because their terms forbid automated odds collection; and we don't score bonuses. Read](https://safebet.ai/nl/sports-betting/how-we-rank/) [Guide · 4 min **Is sports betting legal in the Netherlands? What you can bet on, and the rules** Yes, with a bookmaker licensed by the Kansspelautoriteit (Ksa), if you're 18 or over: 25 companies held an online sports betting licence on October 23, 2026. Licensed bookmakers may only take bets on the result of, or events during, matches in sports recognised by NOC\*NSF, and on horse and trotting races. Bets on youth and under-21 matches, amateur competitions, yellow cards, corners, own goals and other easily manipulated events are banned, and so are bets on elections, transfers and award votes. Read](https://safebet.ai/nl/sports-betting/is-sports-betting-legal/) Researched and written by [SafeBet.ai Research Team](https://safebet.ai/editorial-policy/) · Betting analysts & data scientists The team behind SafeBet.ai’s AI sports picks: data analysts, AI engineers and sports bettors based in Maastricht. Since 2021 our models have analyzed 30,088 matches. We review betting, casino and prediction-market platforms against a published methodology and cite official sources for every fact. [Editorial policy](https://safebet.ai/editorial-policy/) [How we rank](https://safebet.ai/nl/sports-betting/how-we-rank/) [About SafeBet.ai](https://safebet.ai/about/) [Report an error](https://safebet.ai/support/) 18+ Sports betting is legal in the Netherlands only with operators licensed by the Kansspelautoriteit (Ksa), for adults 18+. Only play with money you can afford to lose. Gambling problem? Call [0800 24 000 22](tel:+318002400022) (OpenOverGokken, the Ksa’s helpline, free and anonymous, 24/7) or read our [responsible gambling guide](https://safebet.ai/nl/guides/gambling-help-netherlands/). Top 5 sports betting sites · Netherlands 1. [1 **BetMGM** Best overall 8.6](https://safebet.ai/nl/sports-betting/betmgm-review/) 2. [2 **TOTO** Best for Dutch football 8.2](https://safebet.ai/nl/sports-betting/toto-review/) 3. [3 **Circus** PayPal and no fees 7.8](https://safebet.ai/nl/sports-betting/circus-review/) 4. [4 **ZEbet** Sports only, no casino 7.7](https://safebet.ai/nl/sports-betting/zebet-review/) 5. [5 **bet365** Top-rated app 6.9](https://safebet.ai/nl/sports-betting/bet365-review/) [Full ranking](https://safebet.ai/nl/sports-betting/) Free sports betting site tools - [Betting site licence check (Netherlands)](https://safebet.ai/nl/sports-betting/licence-check/) - [Sportsbook margin calculator (Netherlands)](https://safebet.ai/nl/sports-betting/margin-calculator/) Sports betting guides - [Is sports betting legal?](https://safebet.ai/nl/sports-betting/is-sports-betting-legal/) - [How we rank sportsbooks](https://safebet.ai/nl/sports-betting/how-we-rank/)