Calculate your body mass index (BMI) and assess a healthy weight.
The BMI calculator calculates the body mass index (Body Mass Index) based on height and weight. According to the WHO classification, a normal BMI is 18.5–24.9, under 18.5 is underweight, 25–29.9 is overweight, and over 30 is obesity.
The calculator is completely free, works directly in the browser, and does not store personal information. All calculators on this site use standard formulas; always check the rules that apply where you live.
BMI = weight (kg) ÷ height² (m²)
Enter your measurements into the calculator fields and press the calculate button – the result will be displayed immediately. You can try different values to compare various scenarios.
Weight 78 kg, height 1.75 m → BMI = 78 ÷ 3.0625 = 25.47 (slight overweight).
The result is an estimate – for accurate clinical measurements, consult a healthcare professional.
The calculator is suitable for self-monitoring health, planning workouts, and general health literacy. Tracking values over time provides valuable information about changes in the body.
Remember that a single measurement result does not tell the whole story – what matters more is the direction and trend over multiple measurement periods.
BMI, or body mass index, is a widely used measure that provides a general estimate of body composition relative to height and weight.
BMI = weight (kg) ÷ height² (m)
Example: 75 kg / (1.75 × 1.75) = 24.5
BMI, or body mass index (Body Mass Index), is calculated by dividing weight (kg) by height (m) squared. Example: 75 kg / (1.75 × 1.75) = 24.5. It roughly indicates whether you are underweight, normal weight, or overweight.
According to WHO classification: under 18.5 = underweight, 18.5–24.9 = normal, 25.0–29.9 = overweight, 30.0+ = obesity. The thresholds are the same globally.
BMI is a good population-level measure but does not differentiate between muscle mass and fat mass. A weightlifter may be classified as 'overweight' in BMI without being obese. More precise measures include waist circumference and body fat percentage.
A child's BMI cannot be directly compared to adult values – it changes with growth. Use the growth curves from the National Institute for Health and Welfare (THL).
Our ideal weight calculator provides a target range based on your height and age. Generally, the weight between the lower and upper limits of the normal BMI range is the target area.
Calculate the target weight (BMI 24.9) minus current weight. For example 85 kg and 175 cm: target weight is about 76 kg, weight loss allowance 9 kg. Use our weight loss calculator to calculate the schedule.