Reverse BMI Calculator: Your Instant Weight Estimate

This tool helps you see what your weight would be if you know your BMI and height. It uses a simple formula that finds weight from BMI and height.

How to Use This Tool

Follow these steps for a quick result:

1. Enter your target BMI. A value between 10 and 50 works best.
2. Select your height unit. Pick Centimeters or Feet & Inches.
3. If you choose Centimeters, type your height in centimeters between 100 and 250.
4. If you pick Feet & Inches, enter your height in both feet and inches.
5. Click the button that says "Calculate Weight."
6. Review the result that gives your weight in kilograms, pounds, and stones with extra pounds.

Understanding the Inputs

The reverse BMI calculator needs two items of information.

BMI: The target body mass index you want to achieve. The normal range is 18.5 to 24.9.

Height: Your height can be given in centimeters or in feet and inches. Choose the unit that is most comfortable for you.

How the Calculation Works

The formula is simple: weight (kg) = BMI × height (m)². Height in centimeters is first converted to meters, then squared and multiplied by the target BMI. For example, a target BMI of 22 at a height of 170 cm (1.70 m) gives a weight of 22 × 1.70² = 22 × 2.89 ≈ 63.6 kg, or about 140 lbs (10 stone). The result is shown in kilograms, pounds, and stones-and-pounds.

Interpreting the Results

Alongside the target weight, the calculator classifies the BMI you entered as Underweight, Normal weight, Overweight, or Obese, so you can see how that target compares to the standard adult ranges.

Limitations and Special Notes

BMI should be between 10 and 50, and height between 100 and 250 centimeters; values outside these ranges return an error. This tool runs a simple reverse calculation only — it does not account for muscle mass, frame size, or body composition, and it is not medical advice. A target weight from this calculator does not replace a doctor's assessment of a healthy weight for your specific situation.

Common Use Cases

You might use the reverse BMI calculator if you wish to:

• Plan a goal weight within the normal BMI range.
• See how a given height maps to different BMI targets before adjusting diet or exercise plans.
• Cross-check a target weight suggested elsewhere.