Calculators

Convert between every odds format in real time. Type 2.50 in decimal, instantly see 3/2 fractional, +150 American, and the 40% implied probability. Essential for comparing US, UK and European bookmakers.

Add up to 12 selections. The combined odds, total payout, and net profit update instantly as you change anything. Delete individual legs to see how each affects the total.

The legendary formula used by hedge funds and pro bettors. Enter your bankroll, the bookmaker's odds, and your estimated true probability — get the mathematically optimal stake size for maximum long-term growth without going bust.

When two bookmakers disagree enough that betting both sides locks in profit, this calculator shows you exactly how much to stake on each. Works for 2-way markets (tennis, MMA, basketball spreads).

The single most important calculation in betting. Enter the odds offered and your estimated true probability — instantly see whether the bet has positive expected value (and by how much). This is what separates winning bettors from losing ones.

Strip the bookmaker's margin out of any market to see the 'fair' odds — what they'd be if the bookie took zero profit. Compare these to soft bookmakers to find +EV bets. Essential for sharps who use Pinnacle as the market benchmark.

You're winning a bet but the game isn't over. This calculator tells you exactly how much to stake on the opposite outcome to guarantee profit regardless of what happens — and how much profit you're locking in.

Back multiple horses, players, or outcomes in the same event so you win the same amount regardless of which one comes in. Distributes your stake based on the odds of each selection.

Enter the odds of all outcomes in a market — get the bookmaker's margin (also called vig, juice, or overround). The lower the margin, the better the odds for you. Use this to find sharp bookmakers.

Each-way bets split your stake between a win and a place. This calculator handles the place fraction (1/4, 1/5), shows your return if your selection wins, places, or loses — covers UK and Irish racing rules.

See exactly how a betting bankroll grows (or shrinks) over hundreds of bets given your edge, stake size and bet frequency. Built on the Kelly criterion's growth model. Reveals why discipline matters more than picking winners.

Bookmakers love promos because most people can't compare them properly. This calculator converts any odds boost, free bet, or risk-free offer into its equivalent decimal odds and EV — so you can pick the best promo objectively.

Asian Handicaps remove the draw and split stakes across half/quarter lines. Enter your AH selection, odds and stake — get the exact payout for win, half-win, push (refund), half-loss and loss outcomes.

Like Asian Handicap but for goal totals — handles Over/Under 1.5, 2, 2.25, 2.5, 2.75, 3 with proper splits on quarter lines. Essential for sharp football betting.

Laying a bet means betting AGAINST an outcome — taking the other side of someone else's back bet. This calculator shows your liability (how much you risk) and profit (the lay stake you collect if the bet loses).

CLV is the single most reliable metric for whether you're a winning bettor. It compares the odds you took versus the closing odds at the same bookmaker. Beating the close by 2%+ consistently means you have edge.

Pick N teams, get all 2-leg, 3-leg, ... N-leg parlay combinations automatically. Round Robin reduces variance compared to a single big parlay — you still profit even if one leg loses.

Free bets are worth ~70-80% of face value via matched betting. Back at a bookmaker with your free bet, lay at an exchange — extract guaranteed cash regardless of result.

How often do you need to win at odds of X to break even? Simple but critical math — most bettors don't realize they need 52.4% to beat the standard -110 vig. Essential for filtering tipster claims.

Standard arbitrage covers 2-outcome markets. This handles 3-way football 1X2 — when three bookmakers' prices on home, draw and away together imply <100% probability, you've found an arb.

The simplest bankroll discipline tool. Define a session budget, daily loss limit and profit target. Stop when you hit either. Mathematically optimal for preserving bankroll during downswings.

Quick session tracker. Add each bet's stake, odds and result — get running ROI, win rate, average odds and a profit/loss chart. Data lives only in your browser; refresh wipes it.

Different from fixed-stake growth — this calculates true compound returns when winnings are reinvested every bet. Reveals the explosive power of compounding small edges over long horizons.

Unique calculator. Enter a tipster's win rate, average odds and number of picks — get the statistical probability they're just lucky vs genuinely skilled. Most public tipsters fail this test.

Even winning bettors experience brutal drawdowns. This calculator shows your probability of losing 25%, 50% or 90% of bankroll given your edge and staking — crucial for setting realistic expectations.

See exactly how Full Kelly, Half Kelly, Quarter Kelly and Tenth Kelly compare on the same bankroll across N bets. Reveals why pros never use Full Kelly despite higher EV.

If you follow a tipster, what fraction of your bankroll should you actually stake per pick? Adjusts for their proven edge, their variance, and the cost of their subscription.

Enter odds from multiple bookmakers on the same market — instantly see arbitrage opportunities highlighted across all combinations. Visual cross-bookmaker scan.

Calculates both stages of matched betting — the qualifying bet (small loss) and the free bet conversion — and shows total profit from a welcome bonus cycle.

Unique calculator. If you're consistently winning, how much can you safely withdraw monthly without killing compound growth? Like retirement-fund math for sharp bettors.

Unique tool. Enter the bet you actually placed and the bet you wished you'd placed. See exactly how much EV you left on the table — a brutal honesty tool for self-improvement.

Unique sharp metric. Enter opening odds, your bet odds, and closing odds — see whether you bet with or against the sharp money flow, and how quickly the line moved.

Enter the same bookmaker's odds across different sports (NFL, tennis, MMA, niche soccer) — instantly see which markets they price tightest vs softest. Find their blind spots.

Martingale-style recovery math but with mathematical safety caps. Shows when chasing losses becomes dangerous and your bankroll's hard stop — practical bankroll discipline.

British multi-bet systems combine N selections into automatic combinations of doubles, trebles, accumulators. Trixie (3 picks → 4 bets), Yankee (4 → 11), Lucky 15 (4 → 15 with singles), Heinz (6 → 57), Super Heinz (7 → 120).

Place markets (top 2/3/4 finish) are derived from win odds using bookmaker-specific fractions and field size. Calculate the implied place odds and edge for golf, horse racing, tennis tournaments.

Like ROI tracker but grouped per bookmaker. Identify which books are eating your bankroll, where your edge actually works, and which to deprioritize. Session data lives in browser only.

Standard parlays multiply odds assuming independence. But 'Team A wins + Team A over 2.5 goals' are correlated — winning teams score more. This calculator factors in correlation coefficient for the true parlay odds.

Bookmakers limit winning bettors. This calculator estimates how long until your account gets restricted based on your win rate, stake patterns, promo usage and arbitrage activity. Unique survival model.

Line movement timing differs by sport. Football opens early and moves slowly; tennis opens late and moves fast. This calculator suggests optimal entry timing based on sport, market type, and your edge source.

Are you actually a sharp bettor or just convinced you are? Enter your patterns — average odds, market types, parlay rate, stake variance — and get a Sharp / Square classification with specific improvement suggestions.

Unique psychological tool. Enter your last 10-20 bets with stakes and timing. Algorithm detects three tilt signals: stake escalation after losses, decreased time between bets, and chasing patterns. Brutal honest mirror.

Bookmakers often boost place markets during major races — '5 places at 1/4 odds' instead of standard 3. This calculator handles extra-place promos and shows the EV bump vs standard each-way.

UK spread firms like Sporting Index and IG offer per-unit-stake markets. Your win/loss scales with how far the outcome beats or misses the spread. Calculate exposure and breakeven.

In-play trading: back at one price, lay at lower price for guaranteed profit. Build a multi-step sequence showing capital required, locked profit at each step, and exit conditions.

Got a bet but need to split across 3+ bookmakers due to liquidity or stake limits? This calculator distributes your stake to maximize the average price you get.

Greyhound races have fixed 6 runners. Eliminate 1-2 to dutch the remaining field. This calculator handles standard UK/IE greyhound markets with trap-specific betting.

Tennis offers match winner, correct score (2-0, 2-1, 1-2, 0-2), and set handicap (-1.5, +1.5) — all related. This calculator derives fair prices for each from any one input.

Unique tool. Enter the same market's odds from 5+ bookmakers. The calculator finds the sharpest 'anchor' price (usually Pinnacle), measures how far others deviate, and highlights outliers — both value opportunities and traps.

Unique advanced tool. Some bookmakers let you redirect boost winnings into more boosted bets. This calculator tracks the full wash cycle and shows true compounded EV — most bettors leave money on the table here.

Unique behavioral tool. After hitting a win, do you withdraw or roll it into the next bet? Factors in your edge, current bankroll, end-target, and behavioral risk of tilting. Answers with a clear recommendation.

Unique pro-level tool. Enter line snapshots (open, 12h, 6h, 1h, close). Algorithm detects steam moves (sharp money in), reverse line movement (sharps disagree with public), or pure public action. Sharps use this manually — now in one tool.

Unique tool. Bonus says 'bet €500 to release €50 bonus'. Most bettors don't realize they LOSE money meeting wagering. This calculator shows real expected loss to burn through, vs the bonus value.

Unique psychological tool. Calculates probability of various losing streaks given your win rate. Shows that 10 losses in a row are NORMAL even with edge — fights tilt before it starts.

Forecast = predict 1st AND 2nd in exact order. Tricast = predict top 3 in exact order. High-odds bets unique to horse and greyhound racing. Calculator handles straight, reversed, and combination versions.

Inverse of back-to-lay scalping. Place a lay bet at high odds, then place a back bet at lower odds. Both bets cancel into a guaranteed profit. Used in in-play markets where prices swing.

Goal lines deep-dive: 0.5, 1, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3. Each line has different split behavior. Calculator shows exact payouts and edge for every actual goal scenario.

Bookmakers always price cashouts BELOW fair value — usually 5-15% margin against you. Enter your original bet and the cashout offer to see exactly how much they're skimming.

Unique sharp tool. Pinnacle is the sharpest book on the planet. Track how far other bookmakers have drifted from Pinnacle's current price — large drifts signal sharp action somewhere.

Unique tool. Sharp bettors hit max stake limits at soft books eventually. This calculates at what bankroll size the limit becomes the bottleneck — and how much EV you lose by staying.

Unique tool. More bets = bigger sample = clearer edge proof, but also tilt risk and burnout. This calculator finds your sweet spot — given your edge and psychology, how many bets monthly maximizes expected growth.

Unique self-assessment. Enter recent bets with stakes and results. Calculator detects whether your higher stakes won more often (real intuition) or lost more often (false intuition). Brutal honesty about whether your gut works.

Paying €99/month for a tipster? Calculate exactly how much you need to bet at their claimed edge for the fee to pay itself back. Most casual subscribers never reach breakeven.

Unique tool. Your model finds a 5% edge at 9 AM. By kickoff at 9 PM, that edge has decayed because the line moved. Calculator shows decay curves by sport and market type — bet faster to capture more.

Unique tool. You have edges in 3 sports (football +3%, tennis +1.5%, MMA +2.5%). How to split bankroll? Calculator runs portfolio math — variance + edge → optimal allocation maximizing growth.

You have 6 bookmaker accounts at different balances and ROI levels. You want to deposit €500. Where should it go? Calculator ranks each account by expected ROI growth from the marginal deposit.