Free, instant calculators that do the math for you. Split stakes across selections, convert odds to probabilities, and measure the bookmaker's margin — all in seconds.
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Dutching Calculator
Back multiple selections in the same event and win the same profit regardless of which one comes in. Enter your odds and total stake — the calculator splits it for you.
Convert any odds format — decimal, fractional, or American — into implied probability. Instantly spot value bets when true probability exceeds the bookmaker's line.
Reveal the bookmaker's hidden margin. Enter the odds for all outcomes in a market and see exactly how much overround you're paying — lower margins mean better value.
Enter your odds. All calculators accept decimal odds (the standard in Europe and most online sportsbooks). Some also support fractional and American formats.
Set your stake or market. The Dutching Calculator needs your total stake; the others just need the odds for each outcome in the market.
Read the results. Results appear instantly — no submit button, no waiting. Use the output to make sharper betting decisions.
Frequently Asked Questions
What betting calculators do you offer? We offer three free calculators: a Dutching Calculator for splitting stakes across multiple selections, an Implied Probability Calculator for converting odds to probabilities and finding value bets, and an Overround Calculator for measuring the bookmaker's margin on any market.
Are these betting tools free to use? Yes, all calculators on 99BettingTips are completely free. No sign-up, no limits on usage. Just enter your odds and get instant results.
How do I use the Dutching Calculator? Enter the decimal odds for each selection you want to back, set your total stake, and the calculator will show you exactly how much to wager on each selection so that your profit is the same regardless of which one wins.
What is overround and why does it matter? Overround is the bookmaker's built-in profit margin — the percentage above 100% when you add up all implied probabilities in a market. A lower overround means better value for the bettor. Our Overround Calculator shows you exactly how much edge the bookmaker is taking.
What's the difference between implied probability and true probability? Implied probability is what the odds suggest — it includes the bookmaker's margin. True probability removes that margin to show the actual likelihood of an outcome. When true probability is higher than implied probability, you've found a value bet.