BMI計算機

Enter your height and weight, and the system will automatically calculate your Body Mass Index (BMI) and provide a comprehensive health assessment, including classifications based on both WHO and Chinese standards, health recommendations, a visual representation of your body type, and your basal metabolic rate.

Height centimeters (cm)

170cm

Weight kilogram (kg)

70kg

Age

Gender

22.5

Normal weight

BMI Prime: 0.90

Healthy Weight Range: 53.5 - 72.2 kg

📊 Comparison of Two-Class Classification

📏 BMI Scale

Underweight

Normal

Overweight

Obesity

0 18.5 25 30 50

Normal weight

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Dietary Recommendations

Maintain a balanced diet and eat plenty of fruits and vegetables.
Limit your intake of high-calorie, high-sugar foods
Ensure Daily Protein Intake

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Exercise Recommendations

At least 150 minutes of moderate-intensity physical activity per week
Combining aerobic and strength training yields better results
Maintain a regular sleep schedule and avoid sitting for long periods of time

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Medical Reminder

Get regular checkups and monitor your weight changes
BMI is for reference only; it is recommended that you consult a doctor.
Pay attention to other health indicators, such as waist circumference

Basal Metabolic Rate (BMR)

—

kcal/day

Ideal Weight (Devine)

—

Ideal Weight (Robinson)

—

Ideal Weight (Miller)

—

Ideal Weight (Hamwi)

—

BMI Prime

—

BMI/25

🔄 Reverse BMI Calculation

Enter your target BMI: Target Weight: 63.6 kg

📈 BMI Trend

📋 Measurement Records

Date	Height	Weight	BMI	Categories

❓ Frequently Asked Questions

What is BMI?▼

BMI (Body Mass Index) is a value calculated based on height and weight, used to provide a preliminary assessment of whether a person’s weight falls within a healthy range. The formula is: BMI = weight (kg) / height (m)².

What are the differences between WHO standards and Chinese standards?▼

According to WHO standards, a BMI of 25 or higher is defined as overweight, and 30 or higher as obese. Chinese standards are stricter: a BMI of 24 or higher is considered overweight, and 28 or higher is considered obese. This is because Asian populations typically have higher body fat percentages than Western populations at the same BMI; therefore, using lower thresholds allows for a more accurate assessment of health risks.

What are the limitations of BMI?▼

BMI does not take into account factors such as body fat percentage, muscle mass, or bone density. Athletes or people with well-developed muscles may have a higher BMI but a healthy body fat percentage; older adults with reduced muscle mass may have a normal BMI but a higher body fat percentage. BMI thresholds also vary for pregnant women, children, and certain population groups. It is recommended to assess overall health by considering a combination of indicators, such as waist circumference and body fat percentage.

What is Basal Metabolic Rate (BMR)?▼

Basal Metabolic Rate (BMR) refers to the minimum amount of energy the human body requires to sustain life while in a state of complete rest (fasting, at room temperature, lying down), accounting for approximately 60–75% of total daily energy expenditure. To calculate BMR, you need to enter your age and gender. Mifflin-St Jeor formula: BMR for men = 10 × weight (kg) + 6.25 × height (cm) – 5 × age + 5; BMR for women = 10 × weight (kg) + 6.25 × height (cm) – 5 × age – 161.

What is BMI Prime?▼

BMI Prime is the ratio of the BMI value to the upper limit of the normal range (25). A BMI Prime value of < 0.74 indicates underweight, 0.74–1.00 indicates normal weight, and > 1.00 indicates overweight. For example, when BMI = 22.5, BMI Prime = 22.5/25 = 0.90, indicating that the current weight is 90% of the upper limit of the normal range.

How do I export or save my data?▼

You can use the "Copy Results" button to copy your current BMI data to the clipboard; use the "Export Image" button to save the results as a PNG image; or click the "Export CSV" button in "Measurement History" to export all your history to a CSV file that can be opened in Excel. All data is stored locally in your browser and is not uploaded to any server.

💡 What is a BMI calculator?

The Body Mass Index (BMI) is an internationally recognized measure of the relationship between weight and height, first proposed in the 19th century by the Belgian mathematician Lambert Adolphe Jacques Quetelet. The formula is: BMI = weight (kg) / height (m)².

WHO International Standards:

< 18.5 — Underweight (low body weight)
18.5 - 24.9 — Normal (Healthy Weight)
25.0 - 29.9 — Overweight (excess body weight)
≥ 30.0 — Obesity (Requires Attention)

Chinese Standards (Stricter):

< 18.5 — Underweight
18.5 - 23.9 — Normal
24.0 - 27.9 — Overweight
≥ 28.0 — Obesity

⚠️ BMI is a screening tool and cannot be used to directly diagnose body fat percentage or overall health. Assessment results for specific groups, such as athletes, older adults, and pregnant women, may be inaccurate; please consult a healthcare professional for a comprehensive evaluation.

This tool runs entirely in the browser; the data you enter will not be uploaded to any server .