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Free betting calculators · No account

Stop guessing.
Run the numbers.

20 calculators for back/lay, dutching, arbitrage, EV and stake sizing. Type your odds, get your stake, see the profit before the money leaves your account.

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The next step
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QMW

Quantum Matrix World is a platform that turns advanceds statistical and quantum-inspired models into data-driven sports predictions.


Data Analysis

Smart models

Clearer predictions
Explore Quantum Matrix World

20

Calculators, all free

$0

Forever, no paywall

0

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3

Odds formats supported

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Back/lay

The matched-betting workhorse. Exact lay stake, liability and both outcomes, with commission built in.

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Dutching

Split one bankroll across several selections so every winner pays the same. Add as many runners as you like.

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Arbitrage (surebet)

Two-way and three-way arb stakes with the locked profit, worked out for you.

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Formulas, not guesswork

Our approach combines three disciplines most calculator sites skip.

1

Quantitative Research

We derive every formula from first principles, including stake sizing, liability, and expected value. We show our working on the page, not just the answer.

2

Software Engineering

Every calculator runs instantly in your browser as you type. There is no server round trip, no account, and nothing to submit.

3

Continuous Improvement

We keep adding calculators and refining the ones we have, based on what our users actually ask for.

The full bench 01 Back/lay Cover a bookmaker bet on the exchange. Lay stake, liability, both outcomes. → 02 Back/back Cover a bet with a back bet on a different bookmaker. Two books, guaranteed profit from either outcome. → 03 Lay stake / liability What a lay actually risks, before you accept the bet. → 04 Dutching Split one bankroll across several selections for an equal return. → 05 Odds converter American, decimal, fractional and implied probability — one input, every format. → 06 Implied probability Turn any price into the chance it represents, with the vig stripped out. → 07 Expected value Your edge per bet in dollars, given your own probability estimate. → 08 Kelly criterion Stake sizing from edge and bankroll — full, half and quarter Kelly. → 09 Arbitrage (surebet) Two-way and three-way arb stakes with the locked profit. → 10 Bonus / free bet value What a free bet is worth in cash after you lay it off. → 11 Accumulator / parlay Combined price, payout and the probability you are really taking. → 12 Hedging Close out a live position and take a guaranteed number. → 13 Lay odds converter The fair price of the opposite outcome, from a single price you already have. → 14 Feasibility A conservative probability band and how many attempts a combined bet like this really needs. → 15 Overround / hold Add up a market's prices to see the bookmaker's built-in margin, as a percentage of every dollar staked. → 16 Middle Bet both sides of a shifted line and see the guaranteed floor against the bonus if the score lands in the middle. → 17 Spread converter The price on a point-spread bet in every format, plus a heads-up on push risk for whole-number lines. → 18 Strike rate Your actual win rate against the breakeven rate your average price demands. → 19 Win / loss record Turn a stretch of bets into net profit, ROI, strike rate and your average winning price. → 20 Staking plan Convert a stake between dollars and percentage of bankroll, with a quick-reference unit-size table. →

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