Reverse BMI Calculator – Target Weight from BMI
Calculate target weight from desired BMI and height
For informational purposes only. Consult a healthcare provider for personalized weight management advice.
Table of Contents
How to Use
- Enter your height in centimeters or feet
- Choose calculation mode: specific BMI or BMI category
- Enter target BMI or select category (underweight/normal/overweight/obese)
- Click calculate to see your target weight or weight range
What is a Reverse BMI Calculator?
A reverse BMI calculator works backwards from the standard BMI calculation. Instead of calculating BMI from your current weight and height, it calculates what weight you need to reach a specific BMI target given your height.
This tool is useful for setting weight goals, whether you want to reach a healthy BMI range or achieve a specific body composition target.
How the Calculation Works
The formula rearranges the standard BMI equation:
- Standard BMI formula: BMI = weight (kg) / height² (m²)
- Reverse formula: Weight (kg) = BMI × height² (m²)
- For category ranges, it calculates weight at the minimum and maximum BMI of that category
BMI Categories
| Category | BMI Range | Description |
|---|---|---|
| Underweight | 16.0 - 18.4 | Below healthy weight range |
| Normal Weight | 18.5 - 24.9 | Healthy weight range |
| Overweight | 25.0 - 29.9 | Above healthy weight range |
| Obese | 30.0 - 40.0 | Significantly above healthy weight |
Setting Realistic Weight Goals
When using this calculator to set weight goals:
- Aim for gradual weight loss or gain (0.5-1 kg per week is generally safe)
- Consider consulting a healthcare provider for personalized targets
- Remember that BMI doesn't account for muscle mass or body composition
- Focus on sustainable lifestyle changes rather than quick fixes
- Monitor your progress with regular check-ins
Frequently Asked Questions
- How do I use this calculator to set a weight goal?
- Enter your height and either select a BMI category (like 'Normal Weight') to see the full weight range, or enter a specific BMI value to find the exact target weight. The calculator shows results in both kg and lbs.
- What's the difference between specific BMI and category range modes?
- Specific BMI mode calculates the exact weight for a single BMI value (e.g., BMI 22). Category range mode shows the weight range for an entire BMI category (e.g., Normal Weight: 18.5-24.9 BMI).
- Is the target weight the same for everyone of the same height?
- For a given BMI target, yes - but BMI doesn't account for individual factors like muscle mass, bone density, or body composition. Two people at the same height and BMI may have very different body compositions.
- Should I aim for a specific BMI number?
- Aiming for the middle of the normal BMI range (around 21-22) is often recommended, but individual ideal weights vary. Consult a healthcare provider to determine what's healthy for your specific situation, considering factors beyond just BMI.