Calculate your Body Mass Index instantly. Enter your weight and height to see your BMI, category, and healthy weight range for your height.
Optional: Add age and gender for additional context (BMI calculation remains the same)
Now that you know your BMI, track your nutrition and reach your health goals with BiteKit. Just speak or type what you ate - AI handles the rest.
BMI (Body Mass Index) is a simple measure that uses your height and weight to determine if your weight is healthy. It's calculated by dividing your weight in kilograms by your height in meters squared.
BMI is widely used as a screening tool by healthcare professionals to identify possible weight problems in adults. While it doesn't measure body fat directly, research has shown that BMI correlates with direct measures of body fat.
The BMI formula is straightforward:
Metric: BMI = weight (kg) / height (m)²
Imperial: BMI = (weight in lbs × 703) / height (inches)²
Example: A person weighing 70 kg who is 1.75 m tall: BMI = 70 / (1.75 × 1.75) = 22.9
BMI values are divided into categories that help indicate whether your weight may pose health risks:
May indicate malnutrition or other health concerns
Healthy weight range with lowest health risks
Increased risk of health problems
High risk of weight-related health conditions
Very high risk of health complications
Extremely high risk, medical attention recommended
Use this chart to quickly reference BMI values for different height and weight combinations:
| Height | BMI 18.5 | BMI 25 | BMI 30 |
|---|---|---|---|
| 5'0" (152 cm) | 94 lbs (43 kg) | 128 lbs (58 kg) | 153 lbs (69 kg) |
| 5'4" (163 cm) | 108 lbs (49 kg) | 145 lbs (66 kg) | 174 lbs (79 kg) |
| 5'8" (173 cm) | 122 lbs (55 kg) | 164 lbs (74 kg) | 197 lbs (89 kg) |
| 6'0" (183 cm) | 136 lbs (62 kg) | 184 lbs (83 kg) | 221 lbs (100 kg) |
| 6'4" (193 cm) | 152 lbs (69 kg) | 205 lbs (93 kg) | 246 lbs (112 kg) |
* Values shown are approximate weights at each BMI threshold for the given height
While BMI is a useful screening tool, it has several important limitations you should be aware of:
BMI cannot distinguish between muscle and fat mass. A muscular athlete may have a high BMI despite having low body fat.
Older adults may have more body fat than younger people at the same BMI. Standard BMI categories may not apply equally to all ages.
Women naturally have more body fat than men. BMI does not account for these biological differences between sexes.
Health risks associated with specific BMI values can vary by ethnicity. Some populations may have different optimal BMI ranges.
Important: BMI should be used as a general guide, not a definitive health measure. For a complete health assessment, consult with a healthcare provider who can consider additional factors like waist circumference, blood pressure, cholesterol levels, and family history.
Consider speaking with a healthcare professional if:
BMI (Body Mass Index) is a measure that uses your height and weight to calculate if your weight is healthy. It's calculated by dividing your weight in kilograms by your height in meters squared and is used as a screening tool to identify potential weight problems.
For metric units: BMI = weight (kg) / height (m)². For imperial units: BMI = (weight in lbs × 703) / height (inches)². Our calculator does this math automatically for you.
Underweight: below 18.5, Normal: 18.5-24.9, Overweight: 25-29.9, Obese Class I: 30-34.9, Obese Class II: 35-39.9, Obese Class III: 40 or higher. Each category indicates different levels of health risk.
BMI has limitations. It doesn't distinguish between muscle and fat, so muscular people may have a high BMI despite being healthy. It also doesn't account for age, gender, or ethnicity. Use BMI as one tool among many for health assessment.
A healthy BMI is generally considered to be between 18.5 and 24.9. This range is associated with the lowest health risks for most adults. However, optimal BMI can vary based on individual factors.
For most adults, checking BMI once every few months is sufficient. If you're actively managing your weight, monthly checks can help track progress. Remember that BMI is just one health metric among many.
Track your nutrition effortlessly with BiteKit. Log meals with your voice or text and let AI calculate everything for you.
Learn More About BiteKit