What Is Visceral Fat? Risks, Causes, and Why It Matters
Understand belly fat vs subcutaneous fat and why visceral fat is a health risk.
Waist-to-Height Ratio Calculator
Keep your waist to less than half your height. Check your ratio, your risk band and your target waist in seconds.
Use the same unit for both measurements.
A screening measure, not a diagnosis. It may not suit pregnancy, very muscular builds or some medical conditions. Ask your doctor about your personal risk.
Waist-to-height ratio chart
| Ratio | NICE category | Example at 5 ft 9 in (175 cm) |
|---|---|---|
| Under 0.40 | Take care: may be underweight | Waist under 27.6 in (70 cm) |
| 0.40–0.49 | Healthy | Waist 27.6 to under 34.5 in (70–87 cm) |
| 0.50–0.59 | Increased health risk | Waist 34.5 to under 41.4 in (88–104 cm) |
| 0.60 or more | High health risk | Waist 41.4 in (105 cm) or more |
The ratio is simply waist ÷ height. Because it scales with height, the same rule works for short and tall people: keep your waist under half your height.
Why your waist matters: visceral fat
Fat stored deep in the belly, around the liver and other organs, is far more active than fat under the skin. It releases inflammatory substances and fatty acids that raise the risk of type 2 diabetes, high blood pressure and heart disease. A larger waist relative to height is the simplest home measure of it. Read what visceral fat is and why it matters.
How to bring the ratio down
Interval training is one of the most effective exercise tools against visceral fat: meta-analyses show HIIT reduces abdominal and visceral fat, and the Norwegian 4x4 also improves insulin sensitivity. Combine 1–2 sessions a week with strength training and a modest change in diet. See how to reduce visceral fat with the 4x4, and if you use a GLP-1 medication, how to keep your muscle while you lose weight. Your waist also feeds into your fitness age.
Frequently Asked Questions
What is a healthy waist-to-height ratio?
Between 0.4 and 0.49. The UK’s NICE guideline (2022) recommends keeping your waist to less than half your height. 0.5–0.59 means increased health risk and 0.6 or more means high health risk. The same cut-offs apply to adults of all sexes and most ethnicities.
How do I measure my waist correctly?
Stand up, breathe out normally and measure halfway between the bottom of your lowest rib and the top of your hip bone, which is roughly at the belly button for most people. Keep the tape level and snug but not tight, and don’t pull your stomach in.
Is waist-to-height ratio better than BMI?
For health risk, usually yes. BMI can’t tell muscle from fat or where fat is stored. Waist-to-height ratio tracks central (visceral) fat, the fat around your organs that is most closely linked to type 2 diabetes and heart disease, and it predicts those risks better than BMI in many studies.
Can exercise reduce my waist without weight loss?
Yes, to a degree. Studies of high-intensity interval training, including 4x4-style intervals, show reductions in visceral and abdominal fat even when body weight barely changes. Combining interval training with a moderate change in diet works best.
Does waist-to-height ratio apply to children?
The 0.5 boundary is also used for children over 5, but this calculator is designed for adults. Ask a doctor about a child’s growth.
Sources
- National Institute for Health and Care Excellence (NICE). Obesity: identification, assessment and management (CG189), 2022 update on waist-to-height ratio.
- Ashwell M, Gunn P, Gibson S. Waist-to-height ratio is a better screening tool than waist circumference and BMI for adult cardiometabolic risk factors: systematic review and meta-analysis. Obes Rev 2012;13(3):275-86.
- Maillard F, Pereira B, Boisseau N. Effect of high-intensity interval training on total, abdominal and visceral fat mass: a meta-analysis. Sports Med 2018;48(2):269-288.