The Backwards BMI Calculator inversely computes the weight one should aim for to achieve a desired BMI, based on their height. This reverse calculation is particularly beneficial for setting realistic weight goals tailored to individual health objectives, whether it's gaining, losing, or maintaining weight. By understanding the weight range that corresponds to a healthy BMI for their height, individuals can better plan their diet and exercise routines with specific targets in mind.
Formula of Backwards BMI Calculator
To determine your target weight based on a desired BMI and your height, use the following formula:
Weight (kg) = BMI x (Height in meters)²
For those using imperial measurements, the formula adjusts as follows to convert height into meters and weight into kilograms:
Weight (kg) = BMI x (Height in meters)² / 703
Variables:
BMI: Your Body Mass Index (a numeric value)Height in meters: Your height, converted from centimeters to meters (1 meter = 100 centimeters)
Table for General Terms
Below is a helpful table for general BMI categories and corresponding target weight ranges for an average height of 1.75 meters (175 cm). This table serves as a quick reference to understand what weight ranges correspond to different BMI categories without the need for individual calculations.
| BMI Category | BMI Range | Target Weight for 1.75m (kg) |
|---|---|---|
| Underweight | < 18.5 | < 57 kg |
| Normal weight | 18.5-24.9 | 57 - 76 kg |
| Overweight | 25-29.9 | 77 - 95 kg |
| Obesity | 30+ | > 95 kg |
Note: This table is an approximation for someone with a height of 1.75 meters. For other heights, please use the provided formula.
Example of Backwards BMI Calculator
Let's say someone with a height of 1.70 meters wishes to achieve a 'Normal weight' BMI of 22. Using the formula, the target weight is calculated as:
Weight (kg) = 22 x (1.70)² = 63.58 kg
Thus, for a height of 1.70 meters, aiming for a weight of approximately 64 kg would place you within the 'Normal weight' BMI category.
Most Common FAQs
To convert your height from feet and inches to meters, first convert your total height into inches (1 foot = 12 inches), then multiply by 2.54 to get centimeters, and divide by 100 to convert to meters.
It's reasonable to calculate your BMI every few months or whenever you have a significant change in weight. This frequency ensures you're on track with your health goals without becoming overly fixated on numbers.
No, BMI is a useful starting point but doesn't account for muscle mass, bone density, overall body composition, and racial and gender differences. It's important to consider other factors and possibly consult with a healthcare provider for a comprehensive health assessment.