BLAKbets

Sports betting arbitrage calculator

Enter your total stake and the odds on both sides of a market. See each leg's stake, payout and return, and whether the prices form an arb. No sign-in. Amounts in USD.

Implied probability: 45,05%

Implied probability: 48,31%

Combined probability 93,35%, below 100%, so this pair is an arb.
Leg 1 · stake
$241.26
Payout if it wins: $535.60
Leg 2 · stake
$258.74
Payout if it wins: $535.59
Total stake
$500.00
Minimum payout
$535.59
Profit (7,12%)
+$35.59

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Let the scanner find these pairs for you

The calculator sizes your stakes. BLAKbets finds the opportunities: over 143 arbs detected daily, with calculated stakes, odds freshness indicators and links to both sportsbooks.

View plans

No trial period. See plans and prices on the homepage. Adults aged 18+ only.

Formula

How stakes are calculated

Three steps explain the maths. The calculator handles them for you; here's where the numbers come from.

  1. 01

    Convert odds to probability

    Implied probability is 1 / odds. Odds of 2.22 imply about 45%; 2.07 imply about 48%.
  2. 02

    Check the total

    Add the implied probabilities of both legs. Below 100% indicates an arb. At 100% or above, there is no positive arbitrage return.
  3. 03

    Split your bankroll

    Stake per leg = bankroll × (1 / odds) / sum(1 / odds). Both legs then pay the same amount. Profit is that payout minus your bankroll.

Questions

Calculator questions

How do I calculate arbitrage stakes?

Leg stake = bankroll × (1 / odds) / sum(1 / odds for both legs). This balances the payouts across both outcomes.

How do I know if two prices form an arb?

Add the reciprocals of both prices. Below 1 (100%) means an arb. Exactly 1 breaks even; above 1 means a loss with balanced stakes.

Can I use American odds?

This calculator accepts decimal odds, such as 2.05 or 1.87. Use the odds converter for American odds. Decimal input accepts a comma or a dot.

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