Decimal odds conversion to probability the system is 1/(given odds) then multiply by way of 100 so 1/1. 7 = zero. 5885 extended by means of a hundred * = fifty eight. 8% fractional odds conversion to percentage example 6/four odds – the primary variety is numerator, the second quantity is the denominator the components you need for changing fractional odds is denominator divided through (denominator + numerator) expanded by using 100 so it might be 4 / (6+four) = zero. 40 0. 20 * a hundred = 40%