Reference formulas and worked examples below keep their stated units. Monetary examples use USD; dimensional examples use US customary units unless labeled otherwise. Metric calculator inputs are converted to these reference units before calculation. Choosing another currency does not convert example amounts or exchange money.
How to use this waist-to-height ratio calculator
Measure your waist and height, then use the unit selector for inches or centimeters. Adult reference bands are optional and have a defined scope.
How the calculation works
Waist-to-height ratio (WHtR) = waist circumference ÷ height, with both measurements in the same unit. Multiply by 100 to express waist as a percentage of height.
Stand normally and measure the waist midway between the lowest rib and the top of the hip bones. Read the tape after a normal breath out; avoid tightening it into the skin. Height is measured standing without shoes.
For adults with BMI below 35, NICE describes 0.4 to below 0.5 as healthy central adiposity, 0.5 to below 0.6 as increased, and 0.6 or higher as high. Values below 0.4 are shown as below the reference range, not labeled underweight. Seek clinical advice for interpretation of an increased result.
Height-to-waist is the inverse: height ÷ waist. It has a different numerical value and must not be compared with waist-to-height cutoffs. The half-height measurement is an arithmetic reference, not a prescribed waist goal.
Worked example
A waist of 85 cm and height of 170 cm give 85 ÷ 170 = 0.5, or 50%. The inverse height-to-waist ratio is 2. Converting both measurements to inches gives the same ratio.
Limits and assumptions
Optional adult categories require BMI below 35 and do not assess pregnancy, children, individual health risk or military fitness compliance. No diet, treatment or body-change schedule is generated. Measurements and reference bands cannot replace a clinical assessment.
Frequently asked questions
Is height-to-waist the same as waist-to-height?
No. They are reciprocals. This page labels both; the adult reference bands apply only to waist divided by height.
Can I use feet and inches?
Yes. With Imperial selected, height accepts an entry such as 5 ft 10 in. You can switch to Metric without changing the physical measurements.
Where should I measure my waist?
Measure midway between the bottom rib and top of the hip bones, after a normal breath out. Use circumference, not clothing size.
Is this an Army or Air Force test calculator?
No. Service assessments have their own current protocols and eligibility rules. This is a general measurement tool.
References
NICE NG246: waist measurement and adult waist-to-height reference bands