Waist Size Converter

The Waist Size Converter converts waist measurements between inches and centimetres, and cross-references standard clothing sizes for men, women and children across US, EU, UK and international sizing charts. Knowing your waist measurement in multiple units is essential for international online shopping, tailoring and understanding health risk thresholds based on abdominal circumference.

Waist circumference is one of the most clinically significant body measurements because abdominal fat (visceral fat around the organs) is directly linked to cardiovascular disease, type 2 diabetes and metabolic syndrome risk, independently of overall BMI. The WHO defines health risk thresholds as: women above 80 cm (31.5 inches) face increased risk, above 88 cm (34.6 inches) substantially increased risk; men above 94 cm (37 inches) face increased risk, above 102 cm (40.2 inches) substantially increased risk. These thresholds apply to adults of European ethnicity — Asian populations have lower risk thresholds due to different body composition.

For clothing sizing, waist measurement is most accurate when taken at the natural waist (the narrowest point of the torso, typically 2 to 3 cm above the navel) while breathing normally. Jean waist sizes in inches typically refer to the finished waistband measurement, which can be 1 to 2 inches smaller than body waist due to the waistband sitting at the hip. Pair with our BMI Calculator for comprehensive health assessment and our Unit Converter for other measurements. Free, no registration required.