Formula Used
The calculator uses the corpulence index formula:
CI = weight in kilograms ÷ height in meters3
- Metric weight: kilograms are used directly.
- Pounds: pounds are multiplied by 0.45359237.
- Centimeters: centimeters are divided by 100.
- Inches: inches are multiplied by 0.0254.
- Target weight: selected CI value × height in meters3.
BMI is also shown as a comparison. It does not change the CI result.
How to Use This Calculator
- Enter a record label for your report.
- Add weight and choose kilograms or pounds.
- Choose the height unit and enter the matching height.
- Set your lower and upper CI reference range.
- Choose the number of decimal places.
- Press Calculate CI to view the result above the form.
- Use CSV for spreadsheets or PDF for printed records.
Example Data Table
| Example | Weight | Height | Formula | CI Result |
|---|---|---|---|---|
| Metric adult | 70 kg | 1.75 m | 70 ÷ 1.753 | 13.06 kg/m3 |
| Imperial entry | 154 lb | 5 ft 9 in | 69.85 ÷ 1.753 | 13.03 kg/m3 |
| Shorter height | 55 kg | 1.62 m | 55 ÷ 1.623 | 12.94 kg/m3 |
| Taller height | 80 kg | 1.80 m | 80 ÷ 1.803 | 13.72 kg/m3 |
Understanding Height Weight CI
What CI Shows
Corpulence index, often called ponderal index, relates body weight to height cubed. It uses height more strongly than BMI. This makes it useful when two people have the same BMI but very different body shapes. The calculator accepts metric and imperial entries. It then converts everything to kilograms and meters before the main equation runs.
Why It Helps
CI can support quick screening, coaching notes, and example reports. It is not a medical diagnosis. It should not replace advice from a qualified professional. Use it as a structured number for comparison. The custom target range helps you match your own study, clinic rule, or internal chart. The default range is only a broad guide.
Input Steps
Enter weight first. Choose kilograms or pounds. Then choose the height unit. Use centimeters, meters, inches, or feet with inches. The tool checks that values are positive. It also checks that the target range is logical. Press calculate to view the result above the form. Use the export buttons after entering the same data.
Reading Results
The main value is CI in kilograms per cubic meter. A lower result means weight is lower for the given height cubed. A higher result means weight is higher for the same height. The result panel also shows BMI. BMI is included only as a familiar comparison. It is not used inside the CI equation.
Target Weight Band
For planning, review the target weight band. The calculator multiplies your chosen CI limits by height cubed. That creates a low and high weight estimate for the same height. The midpoint gap shows how far the current weight sits from the middle of that band. This can help with reports, class examples, and careful tracking.
Measurement Notes
Always read results with context. Age, sex, muscle mass, edema, pregnancy, and clinical history can change interpretation. Measurements can also contain error. Stand straight for height. Use a calibrated scale for weight. Keep units consistent when copying results. Download the CSV for spreadsheet work. Download the PDF for a simple printed record. Because height is cubed, small height errors can shift CI noticeably. Record the measurement date too. Rechecking under similar conditions gives cleaner trends. Keep each report linked to its source data and notes.
FAQs
1. What does CI mean here?
CI means corpulence index. It is also called ponderal index. It compares body weight with height cubed. This calculator reports CI in kilograms per cubic meter.
2. Is CI the same as BMI?
No. BMI divides weight by height squared. CI divides weight by height cubed. This makes CI more sensitive to height differences.
3. Which units can I enter?
You can enter kilograms or pounds for weight. You can enter centimeters, meters, inches, or feet with inches for height.
4. Why is height cubed?
Height is cubed to compare weight with a volume-like body size measure. This differs from BMI, which uses height squared.
5. Can this be used for children?
It can be used for educational calculation. Interpretation for children needs age-specific references and professional guidance. Do not use it alone for health decisions.
6. What CI range should I use?
Use the range required by your study, class, chart, or organization. The default range is a broad example only.
7. What is the target weight band?
It is the weight range created from your selected CI limits and current height. It helps compare current weight with a chosen CI band.
8. Is this medical advice?
No. The result is for learning, tracking, and reporting. Ask a qualified professional before making health or treatment decisions.