Free Waist-to-Hip Ratio Calculator & Tracker
Track the health metric the WHO actually recommends — instead of obsessing over a number that fluctuates 4 lbs daily.
What is Waist-to-Hip Ratio (WHR)?
Your WHR is a simple calculation the World Health Organization recommends as a better predictor of metabolic health than BMI. It captures where your body stores fat — which matters far more than total weight.
Unlike the scale, WHR does not fluctuate wildly from water, salt, or hormones. A downward trend in WHR over weeks is a reliable signal that your habits are working — even when your scale refuses to move.
How to measure
- Use a soft tape measure (fabric, not metal)
- Waist: measure at the narrowest point, usually 1 inch above your belly button, exhale naturally before measuring
- Hips: measure at the widest point of your hips and buttocks
- Measure in the morning, before eating, in the same clothes (or none)
- Take 3 readings and use the average
Calculate your WHR
Enter your measurements below:
WHO reference ranges
| Risk level | Women | Men |
|---|---|---|
| Low | Below 0.80 | Below 0.90 |
| Moderate | 0.80 – 0.85 | 0.90 – 0.95 |
| High | Above 0.85 | Above 0.95 |
Source: World Health Organization, Waist Circumference and Waist-Hip Ratio Report (2011)
Track your progress over time
A single measurement tells you where you are. A trend tells you what is actually working.
Measure once a week, same day, same time, same conditions. A consistent downward trend in WHR — even 0.01 per month — means your habits are working, regardless of what the scale says.
nudge Notes includes a built-in WHR tracking log so you can see your trend clearly over 4–8 weeks.
Why not just use BMI?
BMI divides your weight by your height squared. It cannot distinguish between muscle and fat, and it cannot tell you where your fat is stored. A person with high abdominal fat but normal weight may have a healthy BMI and a high-risk WHR. Central fat (belly fat) is independently associated with higher cardiovascular and metabolic risk, regardless of overall body weight.
WHR captures what BMI misses.
Frequently asked questions
How often should I measure?
Once a week. Daily fluctuations in body composition are too small to measure accurately and can be misleading.
Should I measure with or without clothes?
Without, or in the same thin clothes every time. Consistency matters more than the absolute number.
My WHR went up slightly one week. Should I worry?
No. Single-week fluctuations happen from bloating, water retention, and measurement error. Look at the 4-week trend, not individual readings.
Is WHR the only metric I should track?
No. It is one useful signal among several. nudge Notes tracks WHR alongside sleep, food quality, activity, and energy — because progress shows up in multiple places before the scale moves.