BMI calculator
Body mass index compares your weight to your height. It's a rough screening number, not a diagnosis, but it's a useful starting point.
Healthy weight
- Healthy weight for your height
- 57-76 kg
What BMI can and can't tell you
BMI is a quick screen used by doctors worldwide because it needs only height and weight. Across large groups of people it tracks health risks well.
For one person it's rough. It can't tell muscle from fat, so athletes may read as overweight, and it says nothing about where fat sits. A waist above half your height is a useful second check.
BMI for children and teens
The adult cutoffs don't apply under 18. Children and teens are compared with others of the same age and sex using growth percentiles, so ask a pediatrician for that chart.
Healthy weight range by height
Weights that give an adult BMI from 18.5 to 24.9.
| Height | Healthy weight | BMI 25 starts at | BMI 30 starts at |
|---|---|---|---|
| 150 cm (4 ft 11 in) | 42-56 kg | 56 kg (124 lb) | 68 kg (149 lb) |
| 155 cm (5 ft 1 in) | 44-60 kg | 60 kg (132 lb) | 72 kg (159 lb) |
| 160 cm (5 ft 3 in) | 47-64 kg | 64 kg (141 lb) | 77 kg (169 lb) |
| 165 cm (5 ft 5 in) | 50-68 kg | 68 kg (150 lb) | 82 kg (180 lb) |
| 170 cm (5 ft 7 in) | 53-72 kg | 72 kg (159 lb) | 87 kg (191 lb) |
| 175 cm (5 ft 9 in) | 57-76 kg | 77 kg (169 lb) | 92 kg (203 lb) |
| 180 cm (5 ft 11 in) | 60-81 kg | 81 kg (179 lb) | 97 kg (214 lb) |
| 185 cm (6 ft 1 in) | 63-85 kg | 86 kg (189 lb) | 103 kg (226 lb) |
| 190 cm (6 ft 3 in) | 67-90 kg | 90 kg (199 lb) | 108 kg (239 lb) |
| 195 cm (6 ft 5 in) | 70-95 kg | 95 kg (210 lb) | 114 kg (251 lb) |
BMI categories for adults (WHO)
| BMI | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5-24.9 | Healthy weight |
| 25-29.9 | Overweight |
| ≥ 30 | Obesity |
How it's calculated
BMI = weight in kg ÷ (height in m)². In US units: 703 × weight in lb ÷ (height in inches)².
World Health Organization categories for adults: under 18.5 underweight, 18.5 to 24.9 healthy weight, 25 to 29.9 overweight, 30 and above obesity.
The healthy weight range for your height is the weight that gives a BMI from 18.5 to 24.9.
Example: 175 cm and 75 kg. 75 ÷ 1.75² = 24.5, a healthy weight. For 175 cm the healthy range is about 57 to 76 kg.
Questions
Is BMI accurate?
It's a quick screening number. It doesn't tell muscle from fat, so very muscular people can read as overweight. Waist size and how you feel matter too.
Does BMI work for kids?
Not with these cutoffs. Children and teens use age and sex specific percentiles.
What should I do with my BMI?
Use it as a starting point. If you want to change your weight, the calorie and deficit calculators turn it into a daily number.
Let the app keep score
Kalorea sets your target with this formula and then counts every meal from a photo, so you can see each day where you stand.