Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Implied Probability Calculator

Convert decimal or American betting odds into implied probabilities and calculate the bookmaker's total margin (overround). Use it to identify which outcomes are overpriced and assess the book's built-in edge.

Home Team Odds

Away Team Odds

Draw Odds (optional)

Odds Format

Fill in the required fields to see your result.

Betting Odds

Arbitrage Betting Calculator

Identifies guaranteed profit from arbitrage opportunities by computing the optimal stake split across two bookmakers offering opposing sides of the same market. Use it whenever combined implied probabilities sum to less than 100%.

Total Stake ($)

Bookmaker 1 Odds

Bookmaker 2 Odds

Commission Rate (%)

Fill in the required fields to see your result.

Key differences

	Implied Probability Calculator	Arbitrage Betting Calculator
Category	Betting Odds	Betting Odds
Inputs required	4	4
Result	Bookmaker Margin (%)	Arbitrage Profit ($)
What it does	Convert decimal or American betting odds into implied probabilities and calculate the bookmaker's total margin (overround). Use it to identify which outcomes are overpriced and assess the book's built-in edge.	Identifies guaranteed profit from arbitrage opportunities by computing the optimal stake split across two bookmakers offering opposing sides of the same market. Use it whenever combined implied probabilities sum to less than 100%.