bmi calculator kg feet

How this BMI calculator works

This tool calculates your Body Mass Index (BMI) using metric weight (kilograms) and imperial height (feet and inches). It is designed for people who know their weight in kg but usually describe height in feet. The calculator converts feet/inches to meters first, then applies the standard BMI formula.

BMI is a quick screening measurement that helps estimate whether your body weight is low, healthy, high, or very high for your height. It is simple, fast, and commonly used in health checkups.

BMI formula for kg and feet

Step 1: Convert feet/inches to meters

• Total inches = (feet × 12) + inches
• Height in meters = total inches × 0.0254

Step 2: Apply BMI formula

• BMI = weight (kg) ÷ [height (m)]²

Example: if your weight is 70 kg and your height is 5 ft 8 in, your BMI is about 23.5.

BMI categories

The result is usually interpreted with the following ranges:

• Below 18.5 — Underweight
• 18.5 to 24.9 — Healthy weight
• 25.0 to 29.9 — Overweight
• 30.0 to 34.9 — Obesity (Class I)
• 35.0 to 39.9 — Obesity (Class II)
• 40.0 and above — Obesity (Class III)

These categories are population-level guides. Your personal health status should always be interpreted with a qualified healthcare professional.

Why people search for “BMI calculator kg feet”

Many countries use mixed measurement systems in everyday life. A person may track weight in kilograms but state height in feet and inches. A calculator like this removes manual conversion steps and gives a quick, reliable answer.

• No need for separate feet-to-meter conversion tools
• Useful for gym members, students, and health assessments
• Fast screening for weight management goals

What BMI can and cannot tell you

Useful for:

• General risk screening at a population level
• Tracking trend changes over time
• Starting conversations about nutrition and activity

Limitations:

• Does not directly measure body fat percentage
• May classify muscular people as overweight
• Does not show fat distribution (such as abdominal fat)
• Not a standalone diagnosis tool

For better insight, combine BMI with waist circumference, activity level, sleep quality, blood markers, and medical history.

Tips for healthier BMI management

• Prioritize regular movement: walking, resistance training, and cardio
• Focus on whole foods: vegetables, fruits, lean protein, and fiber
• Limit ultra-processed snacks and sugary beverages
• Sleep 7–9 hours consistently
• Track progress monthly instead of daily extremes

Frequently asked questions

Is BMI accurate for everyone?

BMI is a practical estimate but not perfect for all individuals. Athletes, older adults, and some ethnic groups may need additional measures for better assessment.

Can I use decimal inches?

Yes. This calculator accepts decimal inches (for example, 5 feet 9.5 inches).

Is this tool for men and women?

Yes. The formula is the same for adults of all sexes, though health interpretation can vary by person.

Final note

Use this BMI calculator as a starting point, not a final diagnosis. If your result is outside the healthy range, speak with a clinician or registered dietitian for a personalized plan.