Overweight Calculator
Find out how far above the World Health Organization healthy BMI band you are, in kilograms or pounds.
Weight above healthy maximum (kg)
13.7 kg over healthy max
- Your BMI
- 29.4
- BMI category
- Overweight
- Healthy max (BMI 24.9) — kg
- 76.3
- Percent over healthy max
- 18%
The WHO healthy adult BMI band is 18.5–24.9. The upper edge for your height is healthy_max = 24.9 × (height in metres)². "Weight above healthy maximum" is how much you would need to lose to drop to BMI 24.9. The band does not apply in pregnancy, childhood, or to highly muscular athletes — muscle is denser than fat and can push BMI above 25 without indicating excess body fat.
How to use this calculator
Pick metric or imperial and enter your height and current weight. The calculator returns how much you weigh above the healthy maximum — the weight you would need to lose to reach BMI 24.9, the upper edge of the WHO healthy band. It also shows your current BMI, the WHO category it falls in, and the percent over your healthy maximum. If you are inside or below the band, the excess shows as 0.
How the calculation works
The World Health Organization defines an adult BMI of 25.0 or higher as overweight (pre-obese). Rearranging the BMI formula (BMI = kg ÷ m²) for weight at the upper edge of the healthy band gives healthy_max = 24.9 × height_m². "Weight above healthy maximum" is current_weight − healthy_max, in kilograms or pounds. Imperial inputs are converted with NIST-exact factors (1 in = 0.0254 m, 1 lb = 0.45359237 kg) before the formula is applied, so the answer is identical in either unit system. The band applies to adults aged 18 and over and is not valid in pregnancy, in childhood, or for highly muscular athletes — muscle is denser than fat and can push BMI above 25 without indicating excess body fat.
Worked example
A 90 kg adult who is 1.75 m tall. Height squared is 1.75 × 1.75 = 3.0625 m². Healthy maximum = 24.9 × 3.0625 = 76.26 kg, rounded to 76.3 kg. Current BMI = 90 ÷ 3.0625 = 29.4, which is in the WHO overweight band. Weight above healthy maximum = 90 − 76.26 = 13.74 kg, rounded to 13.7 kg (≈ 30.3 lb). Percent over the healthy maximum = 13.74 ÷ 76.26 × 100 = 18.0%.
Frequently asked questions
What counts as overweight under the WHO BMI bands?
The World Health Organization classifies an adult BMI of 25.0 to 29.9 as overweight (pre-obese), 30.0 to 34.9 as obesity class I, 35.0 to 39.9 as obesity class II, and 40.0 or above as obesity class III. Anything from 18.5 to 24.9 is "normal weight". This calculator measures the kilograms or pounds you are above the upper edge of the normal band — the weight at BMI 24.9.
How much overweight am I?
In kilograms: subtract your healthy maximum (24.9 × height in metres squared) from your current weight. At 1.75 m the healthy maximum is 76.3 kg, so an 85 kg adult is about 8.7 kg overweight; a 95 kg adult is about 18.7 kg overweight. The calculator does this for you in either kilograms or pounds.
Is being slightly overweight by BMI actually unhealthy?
BMI is a population-level screening tool, not a clinical diagnosis. Large epidemiological studies (e.g. the Global BMI Mortality Collaboration, Lancet 2016) show all-cause mortality starts to rise above BMI 25 and rises more steeply above BMI 30, but individual risk also depends on fat distribution, fitness, age, and ethnicity. Being a few kilograms inside the overweight band with strong cardiovascular fitness is not the same as the same weight with high abdominal fat and low activity.
Why does muscle make BMI misleading?
BMI uses total body mass and does not separate fat from muscle. Muscle is roughly 18% denser than body fat, so a heavily resistance-trained adult can carry an extra 10–15 kg of lean mass at the same height and land in the BMI overweight or obese band without excess body fat. Body fat percentage, waist circumference, or DEXA scans are more accurate for muscular people.
Does this work for women and men the same way?
The WHO BMI band is sex-neutral, so the calculator returns the same range for women and men of the same height. Women carry slightly more essential body fat than men at the same BMI, but the band does not adjust for that. A sex-aware target would use body fat percentage or lean body mass instead.
Can children or pregnant women use this calculator?
No. The adult WHO band is not valid in pregnancy (your weight includes the foetus, placenta, amniotic fluid, and extra blood volume) or in childhood and adolescence (use age- and sex-specific BMI percentile charts instead — CDC in the US, WHO growth standards internationally). Plugging either group into this calculator returns a numeric answer but the answer does not match clinical guidance.