Sure! Let’s go step by step on how to calculate ideal body weight (IBW) using BMI. I’ll make it clear and precise.
1. Understanding the Formula
BMI is calculated as:
[
BMI = \frac{\text{weight (kg)}}{\text{height (m)}^2}
]
We can rearrange this formula to calculate weight if you know your height and the target BMI:
[
\text{Ideal Body Weight (kg)} = \text{BMI}_{\text{target}} \times (\text{height (m)})^2
]
2. Choose Your Target BMI
- Normal BMI range: 18.5 – 24.9
- Many people use BMI 22 as a “healthy ideal” weight target.
3. Step-by-Step Example
Suppose a person is 170 cm tall (1.70 m) and wants a BMI of 22:
- Convert height to meters: 170 cm → 1.70 m
- Square the height: (1.70^2 = 2.89)
- Multiply by target BMI: (22 \times 2.89 = 63.58 \text{ kg})
✅ Ideal body weight ≈ 64 kg
4. Quick Reference Table (Height vs IBW for BMI 22)
| Height (cm) | IBW (kg) |
|---|---|
| 160 | 56 |
| 165 | 60 |
| 170 | 64 |
| 175 | 67 |
| 180 | 71 |
Tip
- This is a BMI-based estimate, not personalized for muscle mass or body composition.
- For athletes or very muscular people, BMI may underestimate healthy weight.
If you want, I can give you a formula for calculating IBW in pounds too, which is handy if you use the imperial system.
Do you want me to do that?
