Waist-to-hip ratio ranks among the simplest health screening measurements you can take at home, needing only a tape measure and two measurements. This guide walks through measuring correctly and interpreting your result against WHO's risk thresholds.
What You Need
- A flexible tape measure (cloth or vinyl, not a rigid metal one)
- A mirror or a second person to help check the tape is level
- A few minutes standing relaxed, not after eating a large meal or exercising
If you'd rather skip manual division, the Waist-to-Hip Ratio Calculator computes your ratio and risk category instantly from your two measurements.
Step 1: Measure Your Waist Circumference
Stand relaxed with your feet together, and wrap the tape measure around your torso at its narrowest point, typically just above your belly button, roughly at the level of your navel. Breathe out normally before reading the measurement. Don't suck in your stomach or hold your breath, since that gives an artificially low reading.
Worked example: Waist circumference = 85 cm.
Step 2: Measure Your Hip Circumference
Keeping the tape level all the way around, measure at the widest point of your hips and buttocks. This usually sits a few inches below your waist measurement point. Make sure the tape isn't twisted and stays parallel to the floor at every point around your body.
Worked example: Hip circumference = 100 cm.
Step 3: Calculate Your Waist-to-Hip Ratio
WHR = Waist Circumference ÷ Hip Circumference
Using the worked example measurements:
- WHR = 85 ÷ 100 = 0.85
Step 4: Compare Your Result Against WHO Thresholds
| Risk Category | Men | Women |
|---|---|---|
| Low Risk | Below 0.90 | Below 0.80 |
| Moderate Risk | 0.90 - 0.99 | 0.80 - 0.84 |
| High Risk | 1.0 and above | 0.85 and above |
In the worked example, a WHR of 0.85 lands as Low Risk for a man but High Risk for a woman. That gap shows exactly why applying the correct gender-specific threshold matters, rather than reaching for a single universal cutoff.
Step 5: Track Changes Over Time
Re-measure monthly or quarterly under similar conditions, same time of day, similar state of hydration and digestion, to track genuine changes in fat distribution rather than short-term fluctuation. The Waist-to-Hip Ratio Calculator makes repeated tracking quick, and pairing it with the BMI Calculator and Body Fat Calculator rounds out the picture of your overall body composition beyond any single metric.
Common Mistakes to Avoid
Measuring after eating a large meal. Wait at least an hour after eating for a more representative waist measurement.
Sucking in your stomach. This artificially lowers your waist measurement and produces a misleadingly favorable WHR.
Measuring over bulky clothing. Bulky clothing adds inches to both measurements; measure against skin or thin, form-fitting clothing instead.
Applying the wrong gender's thresholds. The risk categories differ meaningfully between men and women, so always use the threshold matching your sex.
Holding the tape at an angle. An uneven, sloped tape measure around your body produces a longer or shorter reading than the true circumference. Use a mirror or a helper to check it stays level.
Key Terms
- WHR (Waist-to-Hip Ratio): the ratio of waist to hip circumference, used by WHO as an indicator of abdominal fat-related health risk.
- BMI: Body Mass Index, a complementary metric measuring overall weight relative to height.
- BMR: Basal Metabolic Rate, useful alongside body composition metrics for broader health and fitness planning.