Free betting tools
The eleven calculations every serious bettor runs before placing a bet — converted, de-margined, sized and measured. Free, no account needed.
Odds converter
Type a price in one format and read it in every other, with the probability the bookmaker is implying.
Open the tool →
Betting margin calculator
Enter every price in a market and see the bookmaker's cut — plus the fair line hiding underneath it.
Open the tool →
EV calculator
Work out what a bet is worth on average: from your own probability, or from a sharp book's line with the margin stripped out.
Open the tool →
Kelly criterion calculator
The stake size that grows a bankroll fastest in the long run — and why most bettors should deliberately bet less than it says.
Open the tool →
Probability calculator
Turn probabilities into prices and back, see what a price demands of you, and find out what a multiple is really worth.
Open the tool →
Arbitrage calculator
Enter the best price available on each outcome and see whether two books together leave a margin — and how to split the stake if they do.
Open the tool →
Parlay calculator
Every leg you add multiplies the price — and multiplies the bookmaker's cut along with it. Here are both numbers before the bet is placed.
Open the tool →
ROI calculator
What the bankroll returned over a period — and why the same 400 of profit is a 40% ROI here and a 4% yield on the other page.
Open the tool →
Yield calculator
Profit measured against everything you staked, not against your bankroll — the one figure that compares two bettors with different amounts of money.
Open the tool →
Stake calculator
The stake a target profit demands at a given price — and the share of your bankroll it quietly commits.
Open the tool →
Bankroll calculator
What a percentage unit actually commits: the stake per bet, the cost of a losing run, and how many consecutive losses the bankroll survives.
Open the tool →Every bet is a comparison between a price and a probability. These eleven calculators do that comparison properly: they translate prices between formats, strip the bookmaker's margin out of a market to expose the fair line, turn a probability estimate into expected value, fold a parlay's legs into one price, show when two books disagree enough to lock an arbitrage, size the stake so a losing run does not end the bankroll, and measure afterwards what those bets actually returned.
They run entirely in your browser — nothing is sent anywhere, nothing is stored, and there is no account to create. Use them on their own, or use them to check what our model already publishes on every match.
The reasoning behind the sums. Each calculator answers one question; these guides explain why the question matters and where the answer stops being reliable: implied probability, expected value, value bets, closing line value, and expected goals (xG).
The model’s call of the day, free on Telegram
No account, no email. Every day we publish the match where our model disagrees most with the market, 15 minutes before it starts — and we settle every pick we publish, won or lost.
Open the channel →