BMI Weight Loss Calculator

Health

See your current BMI and how much weight you would need to lose to reach a healthy range. Enter your weight and height, and this calculator returns your BMI, its category, the healthy weight range for your height, and the weight to lose to reach a BMI of 24.9.

Formula

BMI = weight (kg) ÷ height (m)² Healthy weight = 18.5–24.9 × height² Weight to lose = current weight − (24.9 × height²)
  • BMI is your weight in kg divided by your height in metres squared.
  • The healthy weight range is the weight that keeps your BMI between 18.5 and 24.9 for your height.
  • Weight to lose is how far you are above the top of that range (a BMI of 24.9).
  • If your BMI is already under 25, no weight loss is needed for a healthy BMI.
  • A safe loss is about 0.5–1 kg per week through a modest calorie deficit and regular activity.

85 kg, 1.75 m

Inputs
  • Weight (kg): 85
  • Height (m): 1.75

BMI = 85 ÷ 1.75² ≈ 27.8 (overweight). The healthy range is about 56.7–76.3 kg, so losing roughly 8.7 kg reaches a BMI of 24.9.

Frequently asked questions

How much weight should I lose?
To reach a healthy BMI, lose enough to bring your BMI to 24.9 or below. The calculator shows that exact amount for your height.
What is a healthy weight for my height?
It is the weight range that keeps your BMI between 18.5 and 24.9. The calculator displays this range in kilograms.
How fast can I safely lose weight?
Most guidance suggests about 0.5–1 kg per week. Faster loss is harder to sustain and more likely to be regained.
Is BMI the best weight-loss target?
It is a useful general guide, but it ignores muscle and fat distribution. Waist measurement and body fat add helpful context.
What if my BMI is already healthy?
Then no weight loss is needed for BMI reasons. Focus on maintaining your weight and overall fitness.