Welcome to the Height Per Weight Calculator! This tool helps you quickly check whether your weight is in a healthy range for your height. By combining commonly used health formulas such as BMI (Body Mass Index) and Ideal Body Weight (IBW), the calculator offers insights into your body status. It’s simple to use—all you need are your height and weight measurements. You can dive straight into using the calculator, or keep reading to learn the formulas, examples, and parameter details.
Understanding the Formula
The Height Per Weight Calculator uses two main approaches:
1. Body Mass Index (BMI) Formula
BMI is the most popular way to relate weight to height.
- Metric:
BMI = Weight (kg) / (Height (m) × Height (m)) - Imperial:
BMI = (Weight (lbs) / (Height (in) × Height (in))) × 703
BMI Categories:
- Below 18.5: Underweight
- 18.5 – 24.9: Normal Weight
- 25.0 – 29.9: Overweight
- 30.0 and Above: Obesity
2. Ideal Body Weight (IBW) Formulas
These formulas estimate a healthy weight for your height.
-
Hamwi Formula (1964)
Men: 106 lbs for first 5 ft + 6 lbs for each extra inch
Women: 100 lbs for first 5 ft + 5 lbs for each extra inch - Devine Formula (1974, Metric)
Men: 50 kg + 2.3 kg for each inch over 5 ft
Women: 45.5 kg + 2.3 kg for each inch over 5 ft - Robinson Formula (1983, Metric)
Men: 52 kg + 1.9 kg for each inch over 5 ft
Women: 49 kg + 1.7 kg for each inch over 5 ft
These methods provide slightly different estimates but all serve as guides to assess healthy weight.
Parameters Explained
Weight: Your body weight, entered in kilograms or pounds. It reflects your total body mass.
Height: Your body height, entered in meters or inches. Essential to scale your weight appropriately.
BMI Value: The numerical result from the BMI formula. It indicates weight category relative to height.
IBW Result: An estimate of ideal weight ranges based on gender-specific formulas.
How to Use the Height Per Weight Calculator — Step-by-Step Example
Let’s walk through a quick calculation:
- Input Height: 1.75 m (175 cm).
- Input Weight: 70 kg.
-
Apply BMI Formula:
BMI = 70 / (1.75 × 1.75)
BMI = 70 / 3.0625
BMI ≈ 22.9
This value falls within the “Normal Weight” range.
-
Check IBW (Devine Formula):
For a man, IBW = 50 + 2.3 × (inches above 5 ft).
5 ft = 60 in, 1.75 m ≈ 69 in → 9 in above 5 ft.
IBW = 50 + (2.3 × 9) = 70.7 kg.
The actual weight (70 kg) matches almost perfectly with the IBW estimate.
Additional Information
Here’s a quick reference table for BMI ranges:
| BMI Value | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5–24.9 | Normal Weight |
| 25–29.9 | Overweight |
| ≥ 30 | Obese |
This table can help you interpret your results at a glance.
FAQs
BMI compares weight with height to classify weight status, while IBW estimates the “ideal” weight for height based on gender-specific formulas.
BMI is a useful general guide, but it does not consider muscle mass, body composition, or fat distribution.
BMI is better for general classification, while IBW is more useful when estimating target weights. Using both gives a broader perspective.