Waist-to-height ratio calculator in cm or inches
Divide your waist by your height to see how much fat you carry around the middle. The UK’s NICE guideline puts it simply: keep your waist to less than half your height, a ratio under 0.5. Works with cm, inches, or feet and inches.
By Dt. Trishala Goswami, MSc Clinical Nutritionist, Diabetes Educator, Certified Nutrigenomics Specialist · Last updated October 2026
Waist-to-Height Ratio Calculator
Enter your waist and height in cm or inches. Your waist should be less than half your height.
This tool is general education for adults, not a diagnosis. It is not meant for use during pregnancy. Discuss your numbers with your doctor, and work with a qualified clinical nutritionist to act on them.
What your waist-to-height ratio means
Waist-to-height ratio = waist ÷ height, both in cm or both in inches
Worked example: waist 86 cm, height 160 cm. 86 ÷ 160 = 0.54, increased central adiposity. Half of 160 cm is 80 cm, so the goal would be a waist under 80 cm. In inches: a 34 inch waist at 5 ft 3 in (63 inches) gives 34 ÷ 63 = 0.54.
| Waist-to-height ratio | NICE classification |
|---|---|
| Below 0.4 | Below the range NICE classifies |
| 0.4 to 0.49 | Healthy central adiposity: no increased health risk |
| 0.5 to 0.59 | Increased central adiposity: increased health risk |
| 0.6 or more | High central adiposity: further increased health risk |
These bands come from NICE guideline NG246, Overweight and obesity management (2025), which carried over the waist-to-height ratio advice first added to its obesity guideline in 2022 (NICE NG246; summarised by the guideline committee in the BMJ, 2025). NICE recommends measuring waist-to-height ratio alongside BMI in adults with a BMI under 35, and says the ranges apply to both sexes and all ethnicities, including adults with a high muscle mass (Ashwell, 2025). The health risks linked with more central adiposity include type 2 diabetes, high blood pressure and cardiovascular disease.
How to measure your waist
- Find the bottom of your ribs and the top of your hips.
- Wrap a tape measure around your waist midway between these two points. This is usually just above the belly button.
- Breathe out naturally, then read the tape.
These are NICE’s instructions. The tape should sit flat and level all the way round, snug but not pressing into the skin. Measure your height without shoes. Use the same spot and the same time of day each time you recheck, so the numbers compare fairly.
Does the 0.5 boundary work for Indians?
People of South Asian background tend to carry more fat around the middle and face cardiometabolic risk at a lower BMI. That is why NICE uses lower BMI thresholds for people with a South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean background: overweight from a BMI of 23 and obesity from 27.5 (BMJ, 2025). For waist-to-height ratio, NICE keeps the same bands for everyone.
Indian data support a boundary close to 0.5. In a random sample of 1,178 adults aged 20 to 80 in urban eastern India, waist-to-height ratio predicted cardiometabolic risk factors best of the measures studied, and the optimal cut-off was 0.51 to 0.55 for both sexes (Prasad et al., 2013). In Singapore’s national health surveys of 14,815 Chinese, Malay and Asian Indian adults, waist-to-height ratio performed best in all three groups for spotting undiagnosed diabetes, with 0.52 the most useful cut-off, although the measures generally worked less well in Asian Indian participants than in Chinese participants (Alperet et al., 2016).
So for Indians at home or abroad, a waist under half your height is a sensible goal. Read the result with your BMI, HbA1c and family history, and if your ratio is 0.5 or more, see our guide to insulin resistance symptoms.
Common questions about waist-to-height ratio
What is waist-to-height ratio?
Waist-to-height ratio is your waist measurement divided by your height, both in the same units. It is a simple estimate of central adiposity, the fat carried around the middle, which is linked with type 2 diabetes, high blood pressure and heart disease. The UK's NICE guideline on overweight and obesity recommends it alongside BMI for adults with a BMI under 35.
What is a healthy waist-to-height ratio?
NICE classes 0.4 to 0.49 as healthy central adiposity, 0.5 to 0.59 as increased central adiposity with increased health risk, and 0.6 or more as high central adiposity with further increased health risk. The simple message NICE gives is to keep your waist to less than half your height.
How do I measure my waist correctly?
NICE's instructions: find the bottom of your ribs and the top of your hips, wrap a tape measure around your waist midway between these points (this is usually just above the belly button), and breathe out naturally before reading the tape. Measure on bare skin or thin clothing, with the tape snug but not pressing in.
Is the waist-to-height ratio different for Indians and South Asians?
NICE uses the same ranges for both sexes and all ethnicities, including South Asian adults, as long as BMI is under 35. Indian studies point the same way: in 1,178 adults in eastern India, the most useful cut-off for cardiometabolic risk was 0.51 to 0.55 in both men and women, and in Singapore's national health surveys, which included Asian Indians, 0.52 worked best for picking up undiagnosed diabetes. Both sit close to NICE's 0.5 boundary.
Is waist-to-height ratio better than BMI?
They measure different things. BMI reflects overall weight for height, while waist-to-height ratio looks at fat around the middle. NICE concluded that waist-to-height ratio gives a more accurate assessment of central adiposity and recommends using it with BMI, not instead of it, for adults with a BMI under 35. NICE also uses lower BMI thresholds for people of South Asian background.
What if my ratio is below 0.4?
NICE's healthy range starts at 0.4 and it does not classify lower values. First check the measurement: the tape may have been too high or pulled too tight. If you are underweight, or losing weight without trying, please see your doctor.
How can I bring my waist-to-height ratio down?
Your height will not change, so the goal is a smaller waist. The usual first steps are meals built around protein and vegetables with smaller portions of rice or roti, fewer sugary drinks and fried snacks, more walking and some strength work. Recheck every few weeks the same way. If your ratio is 0.6 or more, talk to your doctor too.
Waist more than half your height? Start with your plate.
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