Work out decimal to fractional odds instantly with clear inputs, formula shown and shareable results.
Fractional odds express profit per unit staked, so decimal minus one is approximated by the closest fraction with a denominator no larger than the limit you set. Traditional boards only carry certain fractions, so 2.75 shows as 7/4 rather than an exact decimal, and the approximation error is the hidden cost of that rounding.
Fraction
fractional odds approximate (decimal odds - 1) as numerator / denominator
Back to decimal
decimal = 1 + numerator / denominator
fractional odds approximate (decimal odds - 1) as numerator / denominator. Fractional odds express profit per unit staked, so decimal minus one is approximated by the closest fraction with a denominator no larger than the limit you set.
Traditional boards only carry certain fractions, so 2.75 shows as 7/4 rather than an exact decimal, and the approximation error is the hidden cost of that rounding.
Enter decimal odds, largest denominator to allow. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.