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BMI & Ideal Weight (Weight Change Chart)

Enter your height, current and target weight, and pace to see how many months it will take and how your BMI changes, shown in a chart and table.

Input

Enter your height, current weight, target weight, and monthly weight-change pace to estimate how long it will take to reach your goal and how your BMI will progress along the way.

cm
kg
kg
kg/mo

Result

This tool provides rough estimates based on general formulas and is not a diagnosis or medical advice.

Estimated time of weight loss to reach target

About 5months

10.0 kg total of weight loss (at 2.0 kg per month)

Current BMI

25.7

Obese (class 1)

Target BMI

22.0

Normal weight

BMI difference

-3.7

Ideal weight 59.9 kg

BMI progression chart

Now

25.7

1 mo

25.0

2 mo

24.2

3 mo

23.5

4 mo

22.8

5 mo

22.0

Colors follow the Japan Society for the Study of Obesity categories (blue = underweight / green = normal / orange to red = obese).

Monthly weight and BMI progression

ElapsedWeightBMICategory
Now70.0 kg25.7Obese (class 1)
After 1 mo68.0 kg25.0Normal weight
After 2 mo66.0 kg24.2Normal weight
After 3 mo64.0 kg23.5Normal weight
After 4 mo62.0 kg22.8Normal weight
After 5 mo60.0 kg22.0Normal weight

How it works

  • BMI is calculated as weight (kg) ÷ height (m)², and the ideal (standard) weight as 22 × height (m)² (BMI 22 is considered the value least associated with illness).
  • From your current weight, target weight, and monthly pace, the time to reach your goal is found as (current weight − target weight) ÷ monthly change.
  • The weight at each month and the BMI at that point are calculated and shown as a horizontal bar chart and a table.
  • Categories follow the Japan Society for the Study of Obesity standard (under 18.5 = underweight, 18.5 to under 25 = normal, 25 and over = obese).
  • Rapid weight loss can harm your health. In general, monthly weight loss within 5% of your current weight is recommended.
  • This tool provides rough estimates based on general formulas and is not a diagnosis or medical advice. Always consult a doctor for health decisions.