Calculator · Renal / metabolic

BMI + waist:height ratio

Body mass index and central adiposity.

What it is for

Obesity classification, CV/diabetes risk. Waist:height < 0.5 = healthy.

Use the working calculator

The working BMI + waist:height ratio calculator is on our calculators page. It is free and needs no account. Enter the values and it shows the result with the reading that goes with it.

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What you enter

The calculator asks for 3 items.

  • Weight (kg)
  • Height (cm)In centimetres. A value under 3 is read as metres (1.75 = 175 cm)
  • Waist circumference (cm)Optional — midway iliac crest to costal margin.

How the result is read

The result is shown as BMI in kg/m². Formula: BMI = weight (kg) / height² (m). Waist:height = waist / height.

The calculator reports one of these readings, with the action that goes with it: Healthy weight; Underweight; Overweight; Obese class I; Obese class II; Obese class III.

Sources

These are the sources the calculator cites. Check the current version before relying on a threshold.

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For qualified clinicians. A score supports a clinical decision and does not make it: check the inputs, read the cited source, and use the tools in your clinical system for patient care where one is provided.