Calculate an estimated weight corresponding to a selected BMI and height using this Reverse BMI Calculator. This calculator can also determine your height or BMI if the other values are entered.

Reverse BMI Calculator

Enter your current weight or goal weight.
Fill any two fields (weight, height, BMI). The calculator will compute the missing value.
Common target BMI values are often 22 to 24 (within the standard “healthy” range of 18.5 to 24.9 for adults).

Important

Not medical advice. BMI is a screening tool and does not diagnose health or directly measure body fat. This calculator is intended for adults and provides an estimate of the weight/height/BMI relationship based on the BMI formula (not a recommended “goal weight”).

  • Children/teens: BMI should be interpreted using BMI-for-age percentiles—check guidance from CDC/NIH or your clinician.
  • Pregnancy/postpartum, athletes/high muscle mass, and some medical conditions can make BMI misleading—talk with a clinician for individualized guidance.
  • If you have (or suspect) an eating disorder or are aiming for a very low BMI, seek professional support before making weight-change plans.

Reverse BMI Formula

The following formulas are used to estimate weight from BMI and height. Use the version that matches your units.

Weight(lb) = BMI * Height(in)^2 / 703
Weight(kg) = BMI * Height(m)^2
  • Weight(lb) uses height in inches (in)
  • Weight(kg) uses height in meters (m)
  • BMI is measured in kg/m² (same BMI value applies in either formula)

For imperial units, multiply BMI by height (in inches) squared, then divide by 703. For metric units, convert height to meters (cm ÷ 100), square it, then multiply by BMI to get weight in kilograms.

Reverse BMI Definition

A reverse BMI is a method for estimating a person’s weight given their BMI and height.

How to calculate reverse BMI?

How to calculate weight from BMI?

  1. First, determine your height.

    Measure your height. Use inches for the lb formula, or if using metric convert centimeters to meters (cm ÷ 100).

  2. Next, determine your BMI.

    Enter a BMI value (or calculate it from your weight and height). Interpret BMI in context with a clinician if you have special circumstances (e.g., pregnancy, high muscle mass).

  3. Finally, calculate your weight.

    Use the matching formula above to calculate the estimated weight for that BMI and height.

FAQ

What is BMI?

BMI stands for body mass index. It is calculated as weight in kilograms divided by height in meters squared (kg/m²). BMI is a screening measure of weight category, but it does not diagnose health.