Body Mass Index (BMI): gives an indication of whether you are a healthy weight for your height. It can be calculated by weight (kg) divided by height squared (m). The ranges are as follows
Indication |
BMI |
Health Risk |
Underweight |
Below 18.5 |
Some health risk |
Normal |
18.5 – 24.9 |
Normal |
Overweight |
25 – 29.9 |
Moderate |
Obese |
30 – 39.9 |
High |
Morbidly Obese |
Over 40 |
Very high health risk |
Waist-to-hip ratio (WHR): |
WHR is an easy, inexpensive, and accurate way to see the proportion of your body fat. This can show if excess weight is putting your health at risk. It can also help predict your risk of heart disease and diabetes. |
Unlike your body mass index (BMI), which calculates the ratio of your weight to your height, WHR measures the ratio of your waist circumference to your hip circumference. It determines how much fat is stored on your waist, hips, and buttocks. |
You can figure out your WHR on your own, or your doctor can do it for you. To measure it yourself: |
1. Stand up straight and breathe out. Use a tape measure to check the distance around the smallest part of your waist, just above your belly button. This is your waist circumference.
2. Then measure the distance around the largest part of your hips — the widest part of your buttocks. This is your hip circumference.
3. Calculate your WHR by dividing your waist circumference by your hip circumference. |
Waist-to-hip ratio chart |
Health risk |
Women |
Men |
Low |
0.80 or lower |
0.95 or lower |
Moderate |
0.81-0.85 |
0.96-1.0 |
High |
0.86 or higher |
1.0 or higher |
Body Fat %
Some modern scales give a fat % estimation. This can be beneficial but not 100% accurate. It will give an indication and the results can be comparable. Some are linked to Garmin watches. Fairly accurate results have been found with the Huawei AH100 Body Fat Scale for R999 on Takealot.
Body Fat |
Description |
Men |
Women |
Essential Fat |
2-5% |
10-13% |
Athletes |
6-13% |
14-20% |
Fitness |
14-17% |
21-24% |
Average |
18-24% |
25-31% |
Obese |
25%+ |
32%+ |
Waist Measurements
Women: (< 80 cm)
-> 80 cm – slight health risk
-> 90 cm substantial health risk
Men: (94 cm)
-> 93 cm – slight health risk
-> 102 cm substantial health risk
Inter-related to BMI
Measure your waist without holding the tape too tightly (or too loosely). As a rough guide, your waist is the narrowest part of your trunk, or approximately 1 inch above your belly button.