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Gambling Analysed by the Numbers

Free calculators, probability guides, and strategy backtests — so you understand the math before you place a bet.

Bonus EV Calculator

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Wagering Calculator

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Arbitrage Calculator

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Kelly Criterion

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RTP / House Edge

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Convert between decimal, fractional, US

Free Gambling Calculators

24 tools covering casino and betting mathematics

Casino Calculators

Calculate expected value, wagering requirements, Kelly stake, RTP, cashback, and more — before you play.

Bonus EV · Wagering · Kelly · RTP · Blackjack · Bankroll · Cashback · and 5 more

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Betting Calculators

Find arbitrage opportunities, calculate value bets, matched betting profit, and optimal accumulator stakes.

Arbitrage · Value Bet · Matched Betting · Acca · Dutching · Each-Way · and 6 more

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Math Guides

Probability, expected value, and house edge — explained clearly

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How Casinos Make Money: House Edge, RTP & the Mathematics Behind Casino Profits

Variance in Gambling Explained: How Swings, Risk & Bankroll Interact

📐 Foundational

Probability in Gambling: How Odds, Streaks and Random Events Actually Work

Strategy Backtests

Real simulation data — not opinion

📊 Strategy backtests publishing soon — Martingale analysis is first.

Analytically Evaluated Casinos

Rated on RTP configuration, bonus EV, and licensing — not on who pays us most

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1

Casumo

Casumo

Casumo combines four regulatory licenses, a deep game library, and transparent RTP publishing. Bonus EV is negative at typical wagering terms — approach promotions with a calculator.

✓ MGA 30x deposit+bonus Wagering

Welcome Bonus

100% up to €100 + 50 Bonus Spins

7.8

/ 10

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Backtest-Verified

Strategy claims are tested with simulation data, not anecdote. We publish the results whether they confirm or contradict the theory.

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RTP Verified

Casino reviews check actual configured RTP against provider defaults — a test almost no other affiliate site runs.

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Independent Ratings

Operators cannot pay to improve their score. Our analytical framework determines ratings, not commercial relationships.

18+ only · Gambling should be entertaining, not a source of income · Responsible Gambling

18+ only · Gambling should be entertaining, not a source of income · BeGambleAware · GamCare · Responsible Gambling