The Overweight Calculator uses Body Mass Index to show whether you are overweight or obese and how much weight you would need to lose to reach a healthy BMI.
You are not overweight (Normal weight).
| BMI | 23.0 kg/m² |
| Category | Normal weight |
| Healthy weight range | 128.9 lbs – 174.2 lbs |
| Weight to lose to reach BMI 25 | none |
For adults, the World Health Organization defines overweight as a BMI of 25 to 29.9 and obesity as 30 or more, split into Class I (30–34.9), Class II (35–39.9) and Class III (40+). Carrying excess weight raises the risk of type 2 diabetes, high blood pressure, heart disease, some cancers, sleep apnoea and joint problems.
BMI = weight (kg) ÷ height² (m²). The healthy weight range is the weight that gives a BMI from 18.5 to 25 at your height, and the amount to lose is your weight minus the weight at BMI 25.
Worked example: at 180 cm and 65 kg, BMI = 65 ÷ 1.8² = 20.1, normal weight; the healthy range is about 59.9–81 kg.
BMI does not distinguish fat from muscle, so very muscular people can be classed as overweight. It also ignores where fat is stored; waist size matters because abdominal fat is more harmful. Asian populations may face higher risk at lower BMIs, and children need age- and sex-specific percentiles.
Losing 5–10% of body weight can already improve blood pressure, blood sugar and cholesterol. A sustainable pace is about 0.5–1 kg (1–2 lb) a week, through a moderate calorie deficit, more whole foods, regular physical activity and enough sleep. Check with a doctor before major changes.
Is a BMI of 25 bad? It is the start of the overweight range; risk rises gradually.
What is a healthy waist size? Under about 94 cm (37 in) for men and 80 cm (31.5 in) for women.
Does age change the ranges? Adult categories are the same for all ages over 20.