Enter a BMI value (Normal range is typically 18.5 – 24.9).
Please enter a valid BMI between 10 and 60.
Enter height in centimeters.
Please enter a valid height.
Feet
Inches
Please enter a valid height.
Calculated Weight Requirement
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Based on the standard BMI formula: Weight = BMI × Height²
Height (Standardized)
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Min Healthy Weight (BMI 18.5)
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Max Healthy Weight (BMI 24.9)
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Weight Ranges for Your Height
Detailed BMI Category Table
BMI Category
BMI Range
Calculated Weight Range
What is "Calculate Weight with BMI and Height"?
To calculate weight with BMI and height is to apply the Body Mass Index formula in reverse. While most people use the calculator to find their BMI based on a known weight, reversing the equation allows individuals to determine a specific target weight for a desired BMI value. This is particularly useful for setting health goals, medical planning, and understanding where one's body mass sits on the spectrum of health metrics.
By inputting a fixed height and a target BMI, you can derive the exact weight required to meet that body mass index. This process helps clarify the relationship between mass and stature, providing a concrete number to aim for rather than a vague idea of "losing weight" or "gaining muscle." It is a tool widely used by nutritionists, personal trainers, and medical professionals to set realistic and safe weight management targets.
Who should use this? Individuals planning a weight loss or gain journey, athletes targeting specific weight classes, and patients following medical advice to reach a specific BMI threshold.
Calculate Weight with BMI and Height: Formula and Explanation
The math required to calculate weight with BMI and height is derived from the standard BMI equation. The standard formula for BMI is weight divided by height squared. Therefore, to solve for weight, we isolate the weight variable.
The Metric Formula
Weight (kg) = BMI × (Height in meters)²
The Imperial Formula
Weight (lbs) = (BMI × Height in inches²) / 703
The factor of 703 in the imperial formula is a conversion constant required because BMI is universally defined in metric units (kg/m²), even when calculated using pounds and inches.
Variables Table
Variable
Meaning
Unit (Metric)
Unit (Imperial)
W
Weight (Target)
Kilograms (kg)
Pounds (lbs)
BMI
Body Mass Index
kg/m²
kg/m²
H
Height
Meters (m)
Inches (in)
Practical Examples (Real-World Use Cases)
Here are two detailed examples showing how to calculate weight with BMI and height in different scenarios.
Example 1: Setting a Healthy Goal (Metric)
Scenario: Sarah is 1.65 meters tall (165 cm). She wants to reach a BMI of 22, which is in the middle of the "Normal" category. She needs to calculate weight with BMI and height to find her target.
Height: 1.65 m
Target BMI: 22
Calculation: Weight = 22 × (1.65)²
Math: 22 × 2.7225 = 59.895
Result: Sarah needs to weigh approximately 59.9 kg.
Example 2: Medical Requirement (Imperial)
Scenario: John is 5 feet 10 inches tall. His doctor advises him to lower his BMI to 24.9 to reduce heart risk. He wants to know the maximum weight he can be to stay within this limit.
Height: 70 inches (5'10")
Target BMI: 24.9
Calculation: Weight = (24.9 × 70²) / 703
Math: (24.9 × 4900) / 703 = 122,010 / 703
Result: John's target weight is approximately 173.5 lbs.
How to Use This Calculator
Using our tool to calculate weight with BMI and height is straightforward. Follow these steps for accurate results:
Select Unit System: Choose between Metric (cm/kg) or Imperial (ft/in/lbs) at the top of the calculator.
Enter Target BMI: Input the BMI value you wish to achieve. A standard healthy BMI is between 18.5 and 24.9.
Enter Height: Input your current height accurately.
Review Results: The calculator will instantly display the weight required to hit that BMI.
Analyze the Chart: Check the visual graph to see where your target weight sits relative to different BMI categories.
Key Factors That Affect BMI Results
When you calculate weight with BMI and height, it is important to remember that BMI is a proxy for body fatness, not a direct measure. Several financial and physiological factors (metaphorically speaking, the "cost" of your health) influence how these numbers should be interpreted.
Muscle Mass vs. Fat: Muscle is denser than fat. A bodybuilder may calculate weight with BMI and height and find they are "obese" by number, even with low body fat.
Age and Gender: Older adults often have more body fat than younger adults for the same BMI. Women typically have more body fat than men at the same BMI.
Bone Structure: Frame size affects overall weight. Someone with a larger frame may naturally weigh more, affecting the "ideal" number you derive when you calculate weight with BMI and height.
Ethnicity: Different ethnic groups have different health risks at the same BMI. For example, Asian populations may face health risks at a lower BMI than Caucasian populations.
Fluid Retention: Daily weight fluctuations due to water retention can skew your actual weight comparison against the calculated target.
Health History: Previous medical conditions may necessitate a different target BMI range than the standard 18.5-24.9.
Frequently Asked Questions (FAQ)
1. Is it accurate to calculate weight with BMI and height for children?
No. For children and teens, BMI is age-and-gender specific (percentiles). This calculator uses adult formulas. Consult a pediatrician for youth metrics.
2. What is the best BMI to aim for?
Generally, a BMI between 18.5 and 24.9 is considered healthy for adults. However, aiming for the middle of this range (21-23) is often a good initial goal when you calculate weight with BMI and height.
3. Can I use this to determine my ideal weight?
Yes, by inputting a "healthy" BMI (like 22), you can see what weight corresponds to that value for your specific height.
4. Why does the calculator show a range?
Health is not a single number. The "Normal" BMI category spans several units, so there is a range of healthy weights for any given height.
5. Does this calculator account for gender?
The standard math to calculate weight with BMI and height does not differentiate by gender. However, interpretation of the result might vary slightly between men and women.
6. What if I am an athlete?
If you are an athlete with high muscle mass, this calculation may suggest a weight that is too low for your physique. Use body fat percentage instead.
7. How often should I recalculate?
Your height rarely changes as an adult, so you only need to calculate weight with BMI and height if your target BMI goal changes.
8. Is BMI the only health metric that matters?
No. Waist circumference, blood pressure, and cholesterol are also critical. This calculator is just one tool in a broader health toolkit.
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