Waist-to-Height Ratio
Free Waisttoheightratio calculator for health & fitness. Enter your measurements for personalized results with clear explanations and reference ranges.
Formula
WHtR = Waist Circumference / Height
Divide your waist measurement by your height. The goal is to keep this ratio below 0.5 - in other words, keep your waist less than half your height.
Worked Examples
Example 1: Healthy Individual
Problem:Person is 175cm tall with 80cm waist.
Solution:WHtR = Waist / Height\nWHtR = 80 / 175\nWHtR = 0.457\n\nThresholds:\n< 0.4 = Underweight risk\n0.4-0.5 = Healthy ✓\n0.5-0.6 = Increased risk\n> 0.6 = High risk\n\nResult: 0.457 is in the healthy range.\nIdeal waist (half height) = 87.5 cm\nThey have 7.5 cm margin below the threshold.
Result:WHtR: 0.46 (Healthy)
Example 2: Increased Risk
Problem:Person is 165cm tall with 92cm waist.
Solution:WHtR = 92 / 165\nWHtR = 0.558\n\nThis exceeds the 0.5 threshold.\nIdeal waist = 165 × 0.5 = 82.5 cm\n\nCurrent waist: 92 cm\nIdeal waist: 82.5 cm\nNeed to reduce: 9.5 cm\n\nCategory: Increased Risk\nRecommendation: Lifestyle changes advised
Result:WHtR: 0.56 (Increased Risk, reduce 9.5cm)
Example 3: Imperial Units
Problem:Person is 5'6\" (66 inches) with 34 inch waist.
Solution:Height = 66 inches = 167.6 cm\nWaist = 34 inches = 86.4 cm\n\nWHtR = 86.4 / 167.6 = 0.515\n\nOr directly in inches:\nWHtR = 34 / 66 = 0.515\n\nIdeal waist = 66 × 0.5 = 33 inches\nCurrent is 1 inch over ideal.\n\nCategory: At threshold - borderline
Result:WHtR: 0.52 (Borderline)
Frequently Asked Questions
What is waist-to-height ratio?
Waist-to-height ratio (WHtR) is your waist circumference divided by your height. The simple rule is 'keep your waist to less than half your height.' It's a screening tool for cardiometabolic health risks and is considered more universal than BMI across different populations.
Why use waist-to-height ratio instead of BMI?
WHtR directly measures abdominal fat, the most dangerous type. BMI doesn't distinguish between muscle and fat or account for fat distribution. WHtR uses the same 0.5 threshold for all adults regardless of sex or ethnicity, making it simpler and more universal. Studies show WHtR better predicts cardiovascular risk.
How does the 'half your height' rule work?
Simply measure your height and divide by 2. That's your ideal maximum waist circumference. For example, if you're 170 cm tall, aim for waist under 85 cm. If you're 5'10\" (70 inches), aim for waist under 35 inches. It's easy to remember and apply.