Your waist size — not just your weight — is one of the clearest signals of health risk from belly fat. This free calculator gives you two research-backed measurements in seconds: your waist-to-hip ratio (WHR) and your waist-to-height ratio (WHtR), along with what each result means for your health. Enter your measurements below (switch between centimeters and inches), and see your risk category based on World Health Organization thresholds.
This tool is for general education and is not a medical diagnosis. Waist-to-hip ratio and waist-to-height ratio are screening indicators only. Talk to a healthcare provider about your personal risk, especially if your results fall in a higher-risk range.
How to Measure Your Waist and Hips Correctly
Accurate measurements matter. Use a flexible tape measure, keep it snug but not compressing the skin, and measure on bare skin or over thin clothing.
- Waist: Measure at the midpoint between the bottom of your ribs and the top of your hip bones (roughly level with your belly button). Exhale normally and don’t suck in.
- Hips: Measure around the widest part of your buttocks, keeping the tape level all the way around.
- Height: Measure standing straight against a wall without shoes (optional, for the waist-to-height ratio).
What Do Your Results Mean?
Both ratios estimate how much fat you carry around your middle — a stronger predictor of metabolic and cardiovascular risk than body weight or BMI alone, because it reflects visceral fat around your organs.
| Measurement | Women | Men |
|---|---|---|
| Waist-to-hip — low risk | Below 0.80 | Below 0.90 |
| Waist-to-hip — moderate risk | 0.80–0.84 | 0.90–0.99 |
| Waist-to-hip — high risk | 0.85 and above | 1.0 and above |
| Waist-to-height — healthy | Below 0.50 (keep your waist under half your height) | |
These thresholds are based on World Health Organization guidance. They are screening tools, not a diagnosis — your doctor can interpret them alongside your full health picture.
How to Improve Your Waist-to-Hip Ratio
You can’t spot-reduce belly fat, but you can lower overall and visceral fat with consistent, evidence-based habits: a modest calorie deficit, higher protein and fiber intake, regular strength training and daily movement, good sleep, and managing stress and hormones. Our complete guide to hormones and belly fat and the articles in our diet and exercise sections break down exactly how.
Frequently Asked Questions
Is waist-to-hip ratio better than BMI?
For estimating health risk from belly fat, waist-based measurements are often more informative than BMI, because BMI can’t tell where you store fat. Two people with the same BMI can have very different visceral fat levels. Many researchers consider waist-to-height ratio one of the simplest, most reliable screening tools.
What is a healthy waist-to-hip ratio?
The WHO considers below 0.80 low-risk for women and below 0.90 low-risk for men. A ratio of 0.85 or higher in women, or 1.0 or higher in men, signals substantially increased health risk.
What is the waist-to-height ratio rule?
A simple rule of thumb: keep your waist circumference to less than half your height. A waist-to-height ratio under 0.50 is generally considered healthy for most adults.
Does the calculator work in inches?
Yes. Both ratios are unit-independent, so you can enter your measurements in centimeters or inches — just keep all measurements in the same unit. Use the toggle at the top to switch.
Can I lower my ratio without losing much weight?
Often, yes. Strength training, better sleep, and reducing refined carbs and alcohol can shrink your waist and reduce visceral fat even when the scale barely moves, because you may be losing fat while preserving or gaining muscle.