Enter your current weight, height, and target BMI to find out exactly how much weight you need to lose. The BMI Weight Loss Calculator shows your current BMI, your target weight, and the weight loss required to reach a healthy BMI range — all in one calculation.
Weight to Lose
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Current BMI
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BMI Category
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Target Weight
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Min Healthy Weight
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Max Healthy Weight
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A BMI between 18.5 and 24.9 is considered healthy for most adults. A BMI below 18.5 is classified as underweight, 25–29.9 is overweight, and 30 or above is classified as obese. These ranges apply to adults aged 20 and over.
BMI is calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²). In imperial units, the formula is (weight in pounds × 703) ÷ (height in inches)². It provides a simple screening measure for weight categories.
The calculator shows you exactly how much weight to lose based on your height and target BMI. Enter your current weight, height, and desired BMI — typically 22 is a mid-range healthy goal — and the calculator computes your target weight and the difference from your current weight.
BMI is a useful screening tool but does not directly measure body fat or overall health. It can misclassify muscular individuals as overweight or miss excess fat in those with low muscle mass. Always consult a healthcare professional for a complete health assessment.
Most health organizations recommend targeting a BMI between 18.5 and 24.9. A goal of 22–23 is commonly used as a comfortable mid-point within the healthy range. Your doctor can help you set a realistic and safe target based on your individual health profile.
Standard BMI ranges are established for adults aged 20 and older and may not be accurate for children, pregnant women, elderly individuals, or highly muscular athletes. Different ethnic groups may also have different risk thresholds, with some studies suggesting lower cutoffs for people of Asian descent.
Health experts generally recommend losing 0.5 to 1 kg (1–2 lbs) per week as a safe and sustainable rate. Losing weight faster than this can lead to muscle loss and nutritional deficiencies. Divide your required weight loss by 0.5–1 kg per week to estimate a realistic timeline.
A BMI of 25.0 to 29.9 is classified as overweight, indicating excess body weight relative to height. A BMI of 30.0 or above is classified as obese, which is further divided into Class I (30–34.9), Class II (35–39.9), and Class III (40+). Higher BMI categories are associated with greater health risks.