Betting Calculators & Tools
Whether you're new to sports betting or looking to sharpen your strategy, these calculators are designed to take the guesswork out of every wager. Each tool breaks down a key concept — from converting odds formats and sizing your bets with the Kelly Criterion, to spotting arbitrage opportunities and building accumulators — so you understand exactly what the numbers mean. Using them regularly builds intuition for value, risk and return before any real money is on the line. Think of this collection as an interactive textbook: learn by doing, see the maths live, and walk away with a clearer picture of how professional bettors think.
Odds & Probability
Convert between decimal, fractional and American odds formats and calculate the true implied probability behind any price — the essential first step to spotting value in any market.
Odds Converter
Free odds converter. Instantly convert betting odds between decimal, fractional, American and implied probability formats. Used by 10,000+ UK bettors.
Expected Value Calculator
Free expected value calculator. Calculate the EV of any bet using your probability estimate and the bookmaker's odds. Identify positive EV bets for long-run profit.
Poisson Match Predictor
Free Poisson match predictor. Calculate score probabilities for any football match using attack and defence strength ratings. Find value in correct score markets.
Both Teams to Score Calculator
Free BTTS calculator. Estimate both teams to score probability using team attack and defence stats with a Poisson model. Find value in BTTS football markets.
Over/Under Goals Calculator
Free over/under goals calculator. Estimate over/under probabilities using Poisson distribution and expected goals (xG). Find value in football totals markets.
Bet Sizing & Bankroll
Mathematically optimal staking strategies — from the Kelly Criterion to flat-stake percentage methods — to protect your capital and maximise long-run growth.
Kelly Criterion Calculator
Free Kelly Criterion calculator. Calculate the optimal stake for any bet using the Kelly formula. Includes full Kelly, half Kelly, and quarter Kelly options.
Bankroll Management Calculator
Free bankroll management calculator. Calculate optimal bet sizes using flat staking, percentage bankroll, Kelly Criterion, and Fibonacci methods. Protect your betting bank.
Variance Simulator
Free variance simulator. Run Monte Carlo simulations on your betting strategy to understand bankroll swings, ruin risk, and expected long-run outcomes. Essential for serious bettors.
Accumulators & Systems
Calculate returns for multi-selection bets covering every combination of winners, from simple accumulators to full-cover Lucky 15, 31 and 63 systems.
Accumulator Calculator
Free accumulator calculator. Calculate potential returns on 2-15 leg accumulators instantly. Add odds in any format. Used by UK bettors for football, horse racing, and more.
System Bet Calculator
Free system bet calculator. Calculate Trixie, Patent, Yankee, Lucky 15, Lucky 31, and Lucky 63 returns instantly. Partial wins still pay with system bets.
Trixie Calculator
Complete guide to Trixie betting. Learn how Trixie bets work, calculate returns with our free calculator, understand odds combinations, and compare with Patent and Lucky 15 bets. Includes strategies for horse racing and football.
Patent Calculator
Free Patent calculator. Calculate Patent bet returns — 7 bets from 3 selections: 3 singles, 3 doubles, and 1 treble. The cheapest full-cover bet with singles.
Yankee Calculator
Free Yankee calculator. Calculate Yankee bet returns — 11 bets from 4 selections covering 6 doubles, 4 trebles, and 1 fourfold. No singles included. Instant results.
Lucky 15 Calculator
Free Lucky 15 calculator. Calculate returns on all 15 bets from 4 selections: 4 singles, 6 doubles, 4 trebles, and 1 fourfold. Includes UK bookmaker bonus rules.
Lucky 31 Calculator
Free Lucky 31 calculator. Calculate returns on all 31 bets from 5 selections: 5 singles, 10 doubles, 10 trebles, 5 fourfolds, and 1 fivefold. Instant results.
Lucky 63 Calculator
Free Lucky 63 calculator. Calculate returns on all 63 bets from 6 selections: 6 singles, 15 doubles, 20 trebles, 15 fourfolds, 6 fivefolds, and 1 sixfold. Learn Lucky 63 betting strategy, odds calculation, and bookmaker bonuses.
Special Bet Types
Advanced tools for exchange betting, arbitrage, matched betting and handicap markets — the techniques professionals use to find guaranteed or edge-positive returns.
Asian Handicap Calculator
Free Asian handicap calculator. Understand quarter lines, half-win and half-lose outcomes, split stakes, and push refunds. Essential for football betting value.
Each Way Calculator
Free each way calculator for UK horse racing and golf. Calculate EW returns with any place fraction, number of places, and Rule 4 deductions. Instant results.
Lay Bet Calculator
Free lay bet calculator. Calculate lay stake, liability, and profit for any lay bet on Betfair or other exchanges. Includes commission calculation.
Matched Betting Calculator
Free matched betting calculator. Calculate qualifying bet losses and free bet profits for SNR and SR free bets. The essential tool for matched betting beginners and pros.
Sure Bet Calculator
Free sure bet and arbitrage calculator. Identify arbitrage opportunities and calculate optimal stakes across bookmakers for a guaranteed profit on any outcome.
Dutching Calculator
Free dutching calculator. Calculate stakes across multiple selections to guarantee the same profit whichever wins. Ideal for horse racing and sports betting.
Live Hedge Calculator
Free live betting hedge calculator. Calculate exactly how much to stake on a second bet to guarantee profit or cut losses. Works for pre-match and in-play betting.
Racing & Events
Specialist calculators for horse racing rules: split payouts when runners tie (dead heat), reduced returns after a withdrawal (Rule 4), and random lucky-dip number generation.
Dead Heat Calculator
Free dead heat calculator for horse racing and golf. Calculate dead heat payouts for win and each way bets when two or more selections finish level.
Rule 4 Deduction Calculator
Free Rule 4 deduction calculator. Calculate adjusted returns after a non-runner withdrawal in UK horse racing. Instant Rule 4 table lookup and calculation.
Lottery Number Generator
Free lottery number generator using cryptographically secure random number generation. Pick random numbers for UK National Lottery, EuroMillions, Powerball, Mega Millions, Irish Lotto and more. Fully random, fair, and unbiased.
Tracking & Analytics
Log every bet, track ROI and analyse your record over time — because knowing your true win rate and return on investment is the only way to measure whether your strategy is working.