Free Odds Converter

Free betting calculators and odds tools

Odds Toolbox is a collection of free calculators for converting odds, checking implied probability, estimating bet returns, working out each way bets, and comparing prediction market prices. Each tool is built for quick educational use, with no sign-up required.

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How this odds converter works

Decimal odds are popular in Europe, fractional odds are common in UK and Irish betting, and American odds are widely used in the United States. This tool lets you switch between all three instantly.

What implied probability means

Implied probability shows the percentage chance suggested by the odds. For example, decimal odds of 2.00 imply a 50% chance. This is useful for comparing bookmaker prices and spotting value.

Worked example

• Enter 2.00 as decimal odds.
• The converter shows Evens fractional odds, +100 American odds, and 50.00% implied probability.
• This means the odds suggest a one-in-two chance before any bookmaker margin or market fees.

FAQ

Does implied probability include bookmaker margin? No. It converts a single price into a percentage before adjusting for overround, commission, or fees.

Which odds format should I use? Use whichever format your bookmaker, exchange, or market displays. The result is the same price shown in different ways.

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