Free betting calculators: odds converter, no-vig, arbitrage, parlay, implied probability, EV and Kelly criterion. No signup.
Every calculator
What this analyser does with your file — You export your transaction history from a casino, drop the CSV here, and the page reconstructs what actually happened: total wagered, total returned, net result, win rate and your
What a wagering requirement really costs — A wagering requirement converts a headline bonus into an expected cost. If you must turn over a bonus thirty times on games with a 4% house edge, the expected cost of clearing it e
How the three odds formats relate — Decimal, fractional and American odds are three notations for the same number: the implied probability of an outcome. Decimal 2.50 is fractional 3/2 and American +150, and all thre
Turning a price into a probability — Implied probability is what the odds say about the chance of an outcome: one divided by the decimal price. At 4.00 the market implies 25%; at 1.25 it implies 80%. If your own estim
What removing the vig actually shows — A bookmaker builds its edge into both sides of a market, so the two implied probabilities add to more than 100%. Removing the vig means scaling them back to 100% to reveal the fair
When two prices guarantee a profit — An arbitrage exists when the implied probabilities across every outcome of a market, taken at the best available price for each, total less than 100%. Stake proportionally to those
How parlay odds are built — A parlay multiplies the decimal odds of every selection, so three 2.00 legs pay 8.00. The probability multiplies too: three 50% chances make a 12.5% chance. The payout grows fast a
What Kelly answers, and when the answer is zero — The Kelly criterion gives the fraction of a bankroll to stake so that the bankroll grows fastest over many repetitions of the same bet. The formula is f = (bp − q) / b, where b is
Expected value in one line — Expected value is the average result of a bet repeated forever: probability of winning times profit, minus probability of losing times stake. Positive EV means the bet makes money
What a VIP ladder is really worth — Every crypto casino VIP programme is a rebate schedule dressed as a status game. The only figures that matter are the wager requirement per tier and the percentage returned at that
How the mines calculator works — The 25-tile mines game is pure combinatorics. With m mines hidden on a 5×5 board, the chance of revealing k safe tiles in a row is C(25−m, k) ÷ C(25, k) — the number of ways to pic
How the pattern generator works — This page draws a layout for the 25-tile mines board: a chosen number of mines plus optional "diamond" tiles marking suggested picks, with the rest left empty. When you supply a se
How the Shuffle weekly bonus estimate works — Shuffle’s VIP program pays a weekly bonus built from two parts: a base of 5% of your theoretical loss — your wager in each game category multiplied by that category’s house edge —
How the Shuffle monthly bonus estimate works — Shuffle’s VIP program pays a monthly bonus built from two parts: a base of 5% of your theoretical loss — your wager in each game category multiplied by that category’s house edge —
Why a slot needs an RTP checker at all — Providers ship the same slot in several RTP configurations — commonly 96%, 94% and 92% — and the operator chooses which one to run. The game looks identical, the maths does not. A
The WagerDB Tools Suite provides professional-grade mathematical calculators for sports betting modeling, casino bankroll management, provably fair cryptographic auditing, and VIP loyalty valuation.
Every calculator in this suite operates 100% client-side in your browser using pure JavaScript/WebAssembly. No account creation, API tokens, cookies, or remote logging are used. Your bankroll parameters, betting models, and seed inputs never leave your device.
Core Mathematical Engines in the Suite
Expected Value (+EV) Engine: Computes true long-run expected monetary return and edge percentages by comparing market odds against estimated true win probabilities.
No-Vig Fair Odds Calculator: De-mutilates two-way and three-way betting markets by stripping bookmaker margin (overround) using multiplicative and power-based models.
Kelly Criterion Optimal Sizer: Calculates exact fractional bankroll allocation ($f^*$) to maximize geometric bankroll growth while controlling volatility risk.
Multi-Leg Parlay Compounding: Determines true joint probabilities, payout multipliers, and cumulative bookmaker edge on accumulator tickets.
VIP & Rakeback Ladder Evaluators: Models the true monetary return of tiered casino VIP programs against wagering requirements and house edge.
Why Client-Side Privacy Matters for Serious Bettors
Online sportsbooks and casinos track betting patterns, sizing calculations and arbitrage interest, and they use that to restrict winning accounts. Every calculator here runs entirely in your browser — the numbers you type are never sent to us, so there is nothing on our side to leak or subpoena. That removes one channel. It does not make you anonymous: your bookmaker still sees every bet you place with it, which is the channel that actually gets accounts limited.
Frequently asked
Are the betting tools free to use with unlimited calculations?
Yes. All calculators are free, open, and unrestricted. There are no daily query limits, premium paywalls, or feature gates.
Which odds formats are supported across the suite?
The converter and calculators support Decimal (European), American (Moneyline), Fractional (UK), and Implied Probability percentages.
How does the VIP calculator estimate rakeback value?
It ingests official tier requirements from our bonus database, calculates total wagering volume needed per tier, and multiplies by the published rakeback percentage and house edge formula.