A completely free yet accurate marker of insulin resistance is the waist to height ratio. Waist to height ratio is an indicator of your risks for obesity, heart disease, diabetes, stroke, and hypertension. It is obtained by dividing waist size by height. Men and women should keep their waist circumference, no more than half their height. Waist/Height Ratio (WHtR) is a far more accurate way of measuring healthy weight than the traditional Body Mass Index (BMI).
Waist to height ratios over 0.5 are considered to be exceptionally risky when it comes to metabolic health.
Waist Circumference is considered a risk factor for heart disease, irrespective of height and build, in the following cases:
Men: Over 94 cm (approximately 37 inches)
Women: Over 80 cm (approximately 31.5 inches)
Your waist measurements are the most accurate just after you wake up from 7-8 hours of sleep.