Betting with your head means understanding what people are talking about. No useless jargon. Each term comes with a numerical example and a link to the matching tool.
How much you win (or lose) over the long run for each euro wagered.
EV = probability x payoff - (1 - probability) x stake. If positive, the bet has mathematical value - long term you win. If negative, you lose. For it to mean anything, your probability estimate has to be reliable.
Example: You bet 1 EUR at odds 2.10 with real probability 55% -> EV = 0.55 x 1.10 - 0.45 x 1 = +0.155 EUR
EV calculatorThe difference between the odds when you posted and the odds at kickoff.
It is the real skill indicator. If you took 2.10 and at kickoff the line had moved to 1.95, you captured +7.7% of value - the market 'came to you'. Positive CLV over the long run is proof your picks have edge.
Example: Pick odds 2.10 / kickoff odds 1.95 -> CLV = +7.7%
How we verify CLVNet profit divided by total wagered.
The 'real' ROI used to measure a tipster. A high hit rate can hide a negative yield (always picking heavy favourites). Yield is calculated with a fixed stake (e.g. 1u) and the real odds at the pick.
Example: 100 bets of 1 EUR, you win 55 at average odds 1.90 and lose 45 -> profit 49.5 EUR - 45 EUR = +4.5 EUR -> yield +4.5%
What the bookmaker keeps on each market.
It is the sum of implied probabilities minus 100%. If the 1X2 odds add up to 105%, the juice is 5%. The lower the juice, the better for the bettor. Pinnacle usually runs 2-3% juice, Spanish books 6-10%.
Example: Odds 2.00 / 3.50 / 4.00 -> 50% + 28.6% + 25% = 103.6% -> juice 3.6%
What the odds say the bookmaker estimates will happen.
It is 1/odds. Odds 2.00 = 50%, odds 1.50 = 66.7%, odds 3.00 = 33.3%. Summing the implied probabilities of a market gives > 100% (the difference is the juice). For a bet to have value, your estimated probability has to beat the implied one.
Example: Odds 2.10 -> 1/2.10 = 47.6% implied probability
How much to bet as a fraction of your bankroll to maximise growth.
Formula: stake% = (odds x prob - 1) / (odds - 1). Betting more than Kelly raises variance without improving growth; betting less reduces it. Most pros use 1/4 or 1/2 Kelly to dampen the swings.
Example: Bankroll 1000 EUR, odds 2.10, prob 55% -> Kelly = (2.10 x 0.55 - 1) / 1.10 = 14.1% -> bet 141 EUR
Kelly calculatorHow many times you must wager the bonus before you can withdraw.
If a 100 EUR bonus has a rollover of 30x, you have to wager 3000 EUR before you can withdraw. Some rollovers apply only to the bonus, others to deposit + bonus (multiplying the volume). There is usually a minimum odds rule (e.g. 1.50): bets below that do not count.
Example: 100 EUR bonus + 30x rollover on B+D, 100 EUR deposit -> 6000 EUR volume at minimum odds 1.50
Rollover calculatorA tie on the bet: you get your stake back, no win, no loss.
Happens when the result lands exactly on the line (e.g. handicap 0, total 2.5 with 2 goals). The bookmaker returns your money. In a parlay, the push leg drops out and the combined odds are recalculated without it.
Betting on several outcomes of the same race/match to win the same amount whoever wins.
You split the stake between two or more options so that whichever one wins gives you the same profit. Useful when you think the win will come from 2-3 candidates. Different from a surebet: here you accept a loss percentage if none of them come in.
Example: Horse A odds 3.00, Horse B odds 4.00 -> 4/7 of stake on A, 3/7 on B -> you win the same if either wins
Covering an open bet by betting the opposite outcome to lock in profit.
If you had 100 EUR at odds 5.00 and the line has dropped to 1.50, you can bet the opposite outcome to 'lock in' part of the profit without waiting for the final. You reduce risk in exchange for capping the maximum upside.
Example: Bet 100 EUR @ 5.00 (wins 400 EUR), current odds 1.50 -> hedge 333 EUR @ 1.50 guarantees ~+67 EUR whatever happens
A combination of odds from different books that gives guaranteed profit.
When the sum of implied probabilities for the best price on every outcome is below 100%, arbitrage exists. You distribute the stake proportionally and win for certain. How long they last: minutes. The comparator shows the ARB badge when it detects one.
Example: Odds 2.10 / 3.50 / 4.00 -> 1/2.10 + 1/3.50 + 1/4.00 = 99.5% -> arbitrage +0.5%
See the comparatorA bet where your probability estimate beats the implied probability.
The concept that makes long-term betting possible. Without value bets, the juice eats you mathematically. Finding them needs either your own models or market reading: lines that have moved, surprise lineups, injuries the market has not priced in.
The capital you set aside to bet - not to live on.
Golden rule: never bet money you need for food, rent, or savings. The bankroll has to be surplus. Betting 1-3% per play is considered conservative; more than 5% is aggressive.
The bookmaker drops your max stake because you are profitable.
Recreational books (bet365, William Hill, etc.) limit winning players quickly: max stake 1-10 EUR instead of 1000 EUR. It is one of the reasons the 'tipster industry' is problematic: if they were really profitable, they would be limited and could not operate.