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Arbitrage Betting Calculator

Enter odds from different sportsbooks for each outcome. If the arb percentage drops below 100%, you have a guaranteed profit — and we show you exactly how much to stake on each leg.

New to this? Start with:No-Vig Calculator, +EV Calculator

Quick start

  1. Enter odds for outcome A from one sportsbook
  2. Enter odds for outcome B from a different sportsbook
  3. Check the arb percentage — below 100% means guaranteed profit
  4. Enter your total stake to see exact amounts per leg

Try a quick example

Book A: Team A at -110, Book B: Team B at +120 — a 97.83% arb yielding a guaranteed $2.22 profit on $100.

odds format selector

Need help with odds formats? Learn this step

Converted

Decimal1.909
Fractional10/11
Probability52.38%

Converted

Decimal2.200
Fractional6/5
Probability45.45%
$
Range$0 – $1,000
✓Arbitrage opportunity found
Round stakes
Verdict

Small Arb

Arbitrage exists but ROI is thin. Watch for rounding and limits.

Guaranteed Profit

$2.16

ROI

2.16%

Total Stake

$100.00

Stake Allocation

Sportsbook 153.5%
Sportsbook 246.5%
In plain English

When two books disagree on a line by enough, you can bet every side and lock in a profit no matter who wins. The arb percentage tells you if the gap exists; a single number below 100% is the green light.

Copy a link that opens this calculator with your current values.

How it works

  1. Enter odds from both books — One on each side of the same event.
  2. Check the arb percent — Below 100% means guaranteed profit; above means no edge.
  3. Get your stake split — The calculator tells you exactly how much to bet each side.

Related Tools and Guides

Strategy

No-Vig Calculator

Remove the sportsbook margin to find true odds

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Pro Betting Toolkit

All-in-one no-vig, EV, and Kelly pipeline

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Arbitrage Betting Guide

Learn how to find and exploit arbitrage opportunities

Arbitrage Calculator FAQs

Placing money on every outcome of the same event at different books, so you win the same amount no matter who wins. It only works when the books disagree enough that the combined implied probabilities fall below 100%.

Check the arb percent. Below 100% means a guaranteed profit exists; at or above means the books are priced efficiently. The calculator runs the math live as you type — no manual calculation needed.

Each leg’s stake is proportional to its implied probability — higher-implied outcomes get less. Enter a total stake and the calculator returns the exact split per side.

Legal in most jurisdictions, but bookmakers can — and do — limit or close accounts they identify as arb bettors. Check your local rules and each book’s terms before scaling up.

The sum of implied probabilities across every leg. Below 100% = edge; 100% or more = priced normally with vig. The lower the number, the bigger your locked-in return — a 97% arb pays 3%.