Odds Converter

This converter takes decimal odds as its input. Decimal odds include the original stake in the total return. For example, decimal 2.50 on a hypothetical £10 winning bet returns £25 in total, consisting of £15 profit and the £10 stake. A losing bet loses the stake under ordinary settled win-bet rules.

The current interface converts decimal input into other formats; it does not accept every format as input. Outputs may be rounded, and the fractional representation is an approximate equivalent rather than necessarily the simplest fraction. These numbers are educational, not an operator settlement quotation.

Implied probability is 100 divided by decimal odds. At 2.50, that gives 40%. Fractional profit odds equal decimal odds minus one: 2.50 becomes 1.50 to one, commonly written 3/2. At 2.00 or above, American odds equal 100 multiplied by decimal odds minus one, so 2.50 becomes +150.

Below decimal 2.00, American odds use a negative number: −100 divided by decimal odds minus one. Decimal 1.50 therefore becomes −200, implying approximately 66.67%. The negative sign describes the price format, not a negative payout.

The implied probability is a break-even rate represented by a price. It is not an independently measured chance of the event happening. Bookmaker margin is not removed by converting one selection. To inspect a complete market, add the implied probabilities of all mutually exclusive and exhaustive outcomes.

For example, two opposing outcomes at 1.90 each imply a total of about 105.26%. The excess over 100% is the overround. That market calculation still does not establish fair probabilities or identify a guaranteed profitable bet. Use hypothetical inputs and avoid treating numerical precision as certainty.