Reverse BMI Calculator

Calculate the weight you need to reach a specific BMI (Body Mass Index) based on your height.

Last updated: 2/3/2026

Data sources:CDC BMI Info,WHO BMI Classification

The Reverse BMI Calculator helps you determine the weight required to achieve a specific Body Mass Index (BMI). This is particularly useful when setting healthy weight goals.

Calculator Inputs

Units*

Metric (cm, kg)Imperial (ft/in, lbs)

Height*

Enter height in cm (Metric) or inches (Imperial)

Target BMI*

Normal BMI range is 18.5 - 24.9

Results

Enter values above to see your results

BMI does not distinguish fat from muscle or account for age, sex, frame size, or ethnicity, so the weight for a given BMI is not a personal target. Muscular people may be healthy above BMI 25 and some populations face elevated risk below it. Discuss weight goals with a clinician, especially if you have a medical condition, are pregnant, or are under 18 (for whom adult BMI cut-offs do not apply).

How It Works

Enter your height and the BMI you want to achieve. The calculator works backward from the standard BMI formula to find the corresponding weight.

Worked example

Targeting BMI 22 (Metric)

Height:1.75 m= (175 cm)

Target BMI:22= Given

Formula:Weight = 22 × (1.75)²= Apply

Square Height:1.75 × 1.75= 3.0625

Calculate:22 × 3.0625= 67.4 kg

Tips & Best Practices

•A healthy BMI is generally considered to be between 18.5 and 24.9.
•Set realistic goals. Aiming for a BMI change of 1-2 points at a time is more sustainable.
•Remember that muscle weighs more than fat, so BMI isn't the only measure of health.

Frequently Asked Questions

What is the formula for Reverse BMI?

Weight = Target BMI × (Height in meters)². For imperial, Weight (lbs) = (Target BMI × Height (in)²)/703.

What is a good target BMI?

For most adults, a BMI between 18.5 and 24.9 is considered healthy. However, age, muscle mass, and other factors play a role.

Guides & Articles

Health

Due Date From Ovulation or Conception Date

Add 266 days to an ovulation date or a conception date. A worked example, why both dates use the same rule, and when the period method is the better start.

Read guide →

Health

How Accurate Are Pregnancy Due Dates?

A due date is the 40-week mark from a period, or 38 weeks from ovulation. Most births are not on that exact day. What moves the estimate, and what replaces it.

Read guide →

Health

How Many Days Is a Pregnancy?

280 days (40 weeks) from the last menstrual period, or 266 days (38 weeks) from conception. Same model, different starting point, plus the term labels clinicians use.

Read guide →