BMI Calculator
Calculate your Body Mass Index (BMI) and understand your weight status
Calculate your Body Mass Index (BMI) to understand your weight status and potential health risks. BMI is a widely used screening tool that estimates body fat based on height and weight.
Calculator Inputs
Choose your preferred unit system
Enter height in centimeters or inches
Enter weight in kilograms or pounds
Results
Enter values above to see your results
How It Works
Enter your height and weight using metric or imperial units. The calculator determines your BMI and provides your weight category with health recommendations.
Worked example
Person 1.75m tall weighing 75kg
175cm / 100= 1.75m1.75 × 1.75= 3.062575 / 3.0625= 24.49Range 18.5-24.9= Normal WeightPerson 5'10" weighing 180 lbs
703 × (lbs / in²)= Setup(5 × 12) + 10= 70 inches703 × (180 / 70²)= 25.8Range 25-29.9= OverweightTips & Best Practices
- •BMI is a screening tool, not a diagnostic test for body fat or health
- •Athletes and very muscular people may have high BMI without excess fat
- •BMI doesn't account for muscle mass, bone density, or fat distribution
- •Consult healthcare professionals for comprehensive health assessments
- •Focus on overall health habits rather than just the BMI number
Frequently Asked Questions
What is a normal BMI range?
A normal BMI range is 18.5 to 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is considered obese.
Is BMI accurate for everyone?
BMI has limitations. It doesn't distinguish between muscle and fat, so athletes may have high BMIs despite being healthy. Age, gender, and ethnicity can also affect interpretation.
What should I do if my BMI is too high or low?
Consult with a healthcare provider for personalized advice. Focus on healthy eating, regular exercise, and lifestyle changes rather than just the BMI number.
How often should I check my BMI?
BMI changes slowly with weight changes. Checking monthly or quarterly is usually sufficient unless you're actively trying to change your weight.
Guides & Articles
Beyond BMI: Body Fat Percentage and TDEE
After the BMI formula: body-fat percentage ranges, the Navy tape method, and how TDEE differs from the height-and-weight ratio.
Why Your BMI Number Isn't the Whole Story
Body Mass Index is a useful starting point, but it doesn't measure your health. Here's a balanced look at what BMI can (and can't) tell you.
Due Date From Ovulation or Conception Date
Add 266 days to an ovulation date or a conception date. A worked example, why both dates use the same rule, and when the period method is the better start.
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