Reverse BMI Calculator – Calculate Exact Target Weight from BMI & Height

This calculation is for you who plan a diet and want to know which weight to aim for in order to achieve a certain BMI, for example 22.

A Reverse BMI Calculator helps users determine their body weight based on a known BMI value and height. Unlike a traditional BMI calculator that finds BMI from height and weight, this tool works in the opposite direction. It is especially useful for people setting fitness targets, medical weight goals, or BMI-based health planning.

This calculator is widely used by adults, fitness professionals, and healthcare providers who want an accurate way to calculate weight from BMI and height without complex manual formulas.

What is a Reverse BMI Calculator?

This is a reversed version of the normal BMI calculation. Instead of calculating the BMI you calculate the weight that will provide you with a certain BMI.

A Reverse BMI Calculator is a health calculation tool that estimates body weight when BMI and height are already known. It answers a common question: “If my BMI is X and my height is Y, what should my weight be?”

This tool is also known as:

1. BMI reverse calculator

2. BMI calculator reverse

3. Inverse BMI calculator

4. BMI to weight calculator

It supports both metric (kg, cm) and imperial (lbs, ft/in) units, making it suitable for global users.

How This Reverse BMI Calculator Works

Our Reverse BMI Calculator uses a medically accepted mathematical relationship between BMI, height, and weight.

Input Required

• Height (cm or ft/in)

• Target BMI value

• Unit system (metric or imperial)

Output Provided

• Exact target weight (real-time)

• Healthy weight range (BMI 18.5–24.9)

• Gain or loss needed from your current weight

• Target BMI category

• Full comparison table showing weights for multiple BMIs at your height

This approach is commonly used in fitness planning, weight-loss or weight-gain goals, and clinical nutrition assessments. The calculator delivers instant real-time results with no button needed and uses full floating-point precision for maximum accuracy.

Formula of Reverse BMI

The reverse BMI calculation is derived from the standard BMI formula used by global health organizations.

Standard BMI Formula BMI = Weight (kg) ÷ Height² (m²) [WHO standard]

Reverse BMI Formula (Metric) Weight (kg) = BMI × Height² (m²)

Imperial Version Weight (lb) = (BMI × Height² (in²)) ÷ 703

These formulas are recognized by World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC).

Step-by-Step Manual Calculation

Example: Metric System Given:

• Height = 170 cm (1.7 m)

• Target BMI = 22

Steps:

1. Convert height to meters → 1.7 m

2. Square the height → 1.7 × 1.7 = 2.89

3. Multiply by BMI → 22 × 2.89

Result: Weight ≈ 63.6 kg

This is the same result produced instantly by our accurate Reverse BMI Calculator.

Reverse BMI Chart (Metric Example)

Reverse BMI for Adults

The Reverse BMI Calculator is primarily designed for adults aged 18 and above. BMI interpretation differs for children, adolescents, and pregnant individuals.

For adults, BMI categories remain standardized:

• Below 18.5 → Underweight

• 18.5 – 24.9 → Normal

• 25 – 29.9 → Overweight

• 30+ → Obese

Metric vs Imperial Calculation Comparison

Our smart Reverse BMI Calculator automatically switches formulas based on selected units and includes full support for feet and inches.

Frequently Asked Questions

How do you calculate weight from BMI?

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Is reverse BMI calculation accurate?

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Can I use a reverse BMI calculator for weight-loss goals?

Yes. Many users use a target BMI weight calculator to plan realistic fitness or medical goals.

What BMI should adults aim for?

Most health authorities recommend a BMI between 18.5 and 24.9 for adults.

Does BMI differ for men and women?

The formula is the same, but body composition differences mean results should be interpreted with context.

Important Note This uses the exact WHO/CDC BMI formula. BMI is a screening tool, not a diagnostic. Always consult a doctor for personalized health advice