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Updated June 2026

Betting,
worked out.

Odds, parlays, each-way, arbitrage, value and stakes – every betting tool in one place. Free, instant, and private.

✓ Independently owned 13 calculators Every formula shown

Jean Borg

Founder & developer · How I build these →

Betting · example

Bet return

single bet

Total return

£254

£154 profit on a £100 stake at 2.54

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Most used

Popular in betting.

Featured

Parlay

Combine selections into one bet for bigger combined odds.

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£

Bet calculator

Returns and profit on any single bet.

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ƒ

Kelly criterion

Size your stake by your edge.
½

Each-way

Settle the win and place parts of a bet.

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13

Betting tools

100%

Free, no sign-up

0

Data stored

1 hr

To build a request

All 13 tools

Browse every betting calculator.

Odds & Value

£Bet CalculatorReturn & profit on a single bet, any format› ÷Betting Odds CalculatorConvert formats & see the payout› %Implied Probability CalculatorOdds to a win %, plus a value check› %Vig CalculatorThe bookmaker’s margin & fair odds›

Multiples & Accumulators

×Parlay CalculatorCombine selections for bigger odds› ×Accumulator CalculatorSettle a UK acca, each-way & insurance› ×Lucky 15 CalculatorAll 15 bets from four selections›

Racing & Handicaps

½Each-Way CalculatorSettle the win and place parts› ±Asian Handicap CalculatorFull, half & quarter line settlement› ÷Dutching CalculatorSplit a stake for equal profit›

Strategy & Staking

ƒKelly Criterion CalculatorSize your stake by your edge› =Arbitrage CalculatorFind a sure bet & split the stakes› =Matched Betting CalculatorLay stake to lock in free-bet profit›

Transparent math

Every bet
shows its work.

No black boxes. Each betting calculator shows the exact formula it used – so you can check it, trust it, and learn it.

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Betting · worked example

Parlay · 3 legs

Leg 1

2.00

Leg 2

1.50

Leg 3

1.80

Combined odds · return on £100

5.40 · £540

All three legs must win for the parlay to land

Combined = 2.00 × 1.50 × 1.80 = 5.40

Questions

Betting questions.

Are these betting calculators really free?

+

Yes – all 13 are completely free, with no sign-up, no account, and no paywalled results.

How accurate are the results?

+

They use the standard betting formulas a bookmaker settles by, and the maths is verified, so they are accurate for working out returns and value. They are for information, not betting advice.

Is anything I enter saved?

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No. Every calculation runs locally in your browser – nothing you type is stored or sent anywhere.

Can you add a betting calculator I need?

+

Yes – request it via the contact page and it can be built and made live fast, free of charge.

The developer

Built by a real person.

Jean Borg

Founder & developer · freecalculators.pro · Malta

I build and maintain every calculator on this site myself, from my desk in Malta. No faceless company and no outsourced content – each tool is coded by hand, shows the exact formula it uses, and gets fixed the moment something is off. Need a betting calculator that is not here yet? Email me and it is usually live within the hour, free.

✓ Handbuilt & maintained ✓ Every formula shown ✓ Nothing you enter is stored
About Jean › Contact me ›

Stay in control

Bet responsibly.

These tools help you understand a bet, not beat the bookmaker – the house edge is always there. Only ever stake what you can afford to lose, and if betting stops being fun or starts to feel out of control, free confidential help is available.

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