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Betting math, explained
Clear guides with worked examples. Every number on these pages comes from the same tested engine as our calculators.
Arbitrage Betting Explained
Arbitrage betting explained with a real example: $100 at 2.10/2.05 returns $103.73, a 3.73% ROI. See the math, risks, and mistakes to avoid.
Each-Way Betting Explained: What Does Each Way Mean?
Each-way betting explained simply: your stake splits into a win and place bet. See how £10 at 5/1 can return £82.50 if it wins.
EV Betting: A Plain-English Guide to Positive EV
Learn EV betting with a worked example: a +150 bet at a 45% win chance has 12.50% EV and $12.50 expected profit per $100 risked.
How Betting Odds Work
Learn how betting odds work, including how -110 means 52.38% implied probability and $100 at +150 pays $250.00. No bookmakers, just the math.
Kelly Criterion: How to Size Bets Using Your Edge
Learn the Kelly criterion with real numbers: a 55% win chance at evens gives a 10.00% full Kelly stake, or $100.00 on a $1,000 bankroll.
Lucky 15 Bet Explained
What is a Lucky 15 bet? See all 15 bets, a £1 example returning £80.00, and each-way odds with real numbers.
Moneyline Meaning: How Moneyline Betting Works
Moneyline meaning explained with real numbers: a -150 favorite implies 60.00% and a +130 underdog pays $130.00 profit on $100.
Over/Under Betting: What Does Over Under Mean?
Over/under betting explained: what the total means, how -110 odds work, and a worked $100 example paying out $190.91.
Spread Betting Explained: What Is a Spread Bet?
Spread betting explained with examples: what −6.5 and +6.5 mean, how a bet covers or pushes, and why −110 means a $100 bet wins $90.91.
UK System Bets Explained
System bets explained: how Trixies, Yankees and Lucky 15s work, with a £1-per-bet example (£15.00 total stake) returning £80.00 from four evens winners.
What Is a Parlay?
What is a parlay? A $100 bet on three −110 legs pays $695.79 if all three win. See the math, a worked example, and common mistakes.
What Is a Patent Bet?
A Patent bet covers 7 bets from 3 selections. See a worked example where £7.00 staked returns £139.00, plus a breakdown table.
What Is a Push in Betting?
A push in betting means a tie — you get your $100.00 stake back with $0.00 profit. See how pushes affect parlays with real numbers.
What Is a Round Robin Bet?
What is a round robin bet? See a $10-per-parlay, 4-pick example with $60 staked, a $218.68 payout, and $158.68 profit if all picks win.
What Is a Teaser Bet?
What is a teaser bet? Learn how teaser betting works, with a worked $110 example paying $210.00 and a break-even table built from real numbers.
What Is a Trixie Bet?
A Trixie bet is 4 bets from 3 selections. See a worked £1 Trixie example with £20.00 return from three evens winners.
What Is a Yankee Bet?
What is a Yankee bet? 11 bets from 4 picks, no singles. See a £1 Yankee example returning £72.00 from four evens winners.
What Is an Accumulator Bet?
What is an accumulator bet? See how a £10 four-fold returns £250.00, with a full worked example and table.
What Is Matched Betting?
What is matched betting? Learn the mechanics, worked £10 example (−£0.45), and real risks. UK guide with a free matched betting calculator.
What Is Vig in Betting?
What is vig in betting? How vigorish works, with a −110/−110 example: 4.76% margin, 4.55% theoretical hold and 50.00% fair odds.