ZiCalculator – BMI Calculator
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BMI Calculator

Use this free BMI Calculator to determine your Body Mass Index and understand your weight category. Suitable for students, professionals, and anyone monitoring their health.

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About BMI

Body Mass Index (BMI) is a number calculated from a person’s weight and height, giving a reliable indicator of whether their weight is under, normal, or overweight. BMI is widely used by healthcare professionals to assess health risks.

How to Calculate BMI Manually

Metric Formula: BMI = weight(kg) / (height(m))²

Imperial Formula: BMI = (weight(lbs) / (height(in))²) × 703

BMI Categories & Health Advice

  • Underweight: BMI < 18.5 – Consider gaining weight with a balanced diet
  • Normal weight: BMI 18.5–24.9 – Maintain your current lifestyle
  • Overweight: BMI 25–29.9 – Consider a healthy diet and exercise
  • Obese: BMI ≥ 30 – Consult a healthcare professional for guidance

Real-Life Examples

For example, a person weighing 70 kg and 175 cm tall has a BMI of 22.86 (normal weight). A person weighing 95 kg at the same height has a BMI of 31.0 (obese).

Why BMI Matters

Maintaining a healthy BMI reduces the risk of heart disease, diabetes, and other health issues. It’s a simple, effective way to monitor your health over time.

Frequently Asked Questions

Is this calculator free? Yes, completely free to use.

Does it store my personal data? No, all calculations run locally in your browser.

Can I use it on mobile devices? Yes, fully responsive and works on all devices.

Can I rely on BMI for children? BMI charts for children differ; consult pediatric guidance.

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