Home Free calculator Articles Download Articles Short, data-first notes on odds, margin and handicap pricing. No tips, no predictions.
How to calculate the margin a bookmaker builds into its prices, with three worked examples and the number most people never check.
1/odds is not a prediction. It is a price. Here is the difference, and why a 50% shot still loses money.
The water level is a payout multiplier, not a price. Here is how to read it, and why a higher water level is not automatically better.
A value bet is not a hunch. It is a comparison between your fair probability and the probability the price implies. Here is how to write it down.
The margin, not the result, is where the money comes from. A short explanation of the overround and why balancing the book matters more than picking winners.
What the line means, how the quarter ball splits a stake in half, and why the same match can be priced three different ways.
The arithmetic of sample size: why 100 bets tells you almost nothing, and roughly how many you need before a hit rate means anything.
Parlay arithmetic: how a 5% margin per leg becomes 15.8% over three legs, and why most accumulators are a worse deal than they look.
The staking formula that maximises long-run growth, what it assumes about your numbers, and why a 10% Kelly stake can be a route to ruin when the estimate is wrong.
A short, worked tutorial: standard error, the 95% interval, and how to read a record table without being fooled by a small sample.
OddsLab is an odds analysis tool. It shows what the market is charging.
It does not provide tips, predictions or any promise of profit.