BMI Calculator
Enter height and weight to view BMI and weight category.
Enter height and weight to view BMI and weight category.
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Check your body mass index and the healthy weight range for your height.
Body mass index
22.9
BMI between 18.5 and 24.9 is generally associated with balanced weight-to-height ratios. Keep pairing movement, nutrition, and regular checkups.
Weight
70 kg (154.3 lb)
Kilograms and pounds mirror each other as you edit either field.
Height
175 cm (5 ft 8.9 in)
Centimetres instantly translate into feet and inches for quick comparisons.
Metric formula: 70 kg ÷ (1.75 m × 1.75 m)
Imperial formula: 154.3 lb × 703 ÷ (68.9 in × 68.9 in)
We square your height, divide your weight by that value, and round the result to one decimal place for clarity.
Target BMI: 18.5 – 24.9
For your height: 56.7 – 76.3 kg (124.9 – 168.1 lb)
Staying within this band is associated with lower cardiometabolic risk for most adults. Individual goals may differ based on age, muscle mass, and medical history.
BMI below 18.5 suggests low body weight for height. Consider adding nutrient-dense meals and strength work, ideally with guidance from a clinician.
BMI between 18.5 and 24.9 is generally associated with balanced weight-to-height ratios. Keep pairing movement, nutrition, and regular checkups.
BMI of 25 to 29.9 signals higher-than-ideal weight for height. Gradual adjustments to activity, sleep, and diet can help shift closer to the healthy range.
BMI of 30 or higher indicates obesity. Work with a doctor or nutrition professional to create a personalised plan focusing on sustainable habits.
BMI is a screening tool and may not reflect body composition for athletes, growing children, or people with high muscle mass. Discuss personalised targets with a healthcare professional.
The BMI calculator streamlines routine health check-ins with a clean interface that keeps the score, category, and guidance in one view. Instead of fumbling with complex formulas or searching for charts, you get an instant, personalized assessment of where you stand.
Automatic conversions sync metric and imperial entries so you can use whatever scale is nearby and still compare week to week. Whether you measure in kilograms and meters or pounds and inches, the tool bridges the gap seamlessly, ensuring your data is always accurate.
Professionals use the snapshot to brief clients, while households track progress toward fitness challenges without memorising formulas. It serves as an objective starting point for conversations about lifestyle, nutrition, and long-term health goals, removing the guesswork from weight management.
Save time during medical appointments by arriving with a documented BMI trend and the healthy weight range that applies to your height. Having a history of your measurements allows doctors to see the bigger picture rather than just a single data point.
The tool flags when further assessment may be needed, helping you prioritise conversations about nutrition, exercise, or screenings. It empowers you to ask the right questions and seek the right support, whether that's a dietician, a personal trainer, or a medical specialist.
Pair the results with meal logs, wearable data, or shared family dashboards to keep everyone accountable. By integrating BMI tracking into your regular routine, you turn health from a vague concept into a measurable, manageable project.
The BMI Calculator is the standard screening tool used by doctors and the CDC. It uses your height and weight to place you in a category: Underweight, Healthy Weight, Overweight, or Obesity.
Why use it? It is a quick way to check if your weight might be putting you at risk for health problems like heart disease, diabetes, and high blood pressure.
Follow these steps:
According to the Centers for Disease Control and Prevention (CDC):
A simple weight-for-height ratio. Formula: (Weight (lbs) / Height (in)²) x 703.
Fat stored deep inside the belly, wrapped around organs. This is more dangerous than subcutaneous fat (fat under the skin).
Muscle Mass: A football player might have a BMI of 30 (Obese) because muscle is denser than fat, even if they have low body fat.
Age: Older adults often lose muscle. A "healthy" BMI might actually mask low muscle mass.
High BMI is linked to Type 2 Diabetes, Coronary Heart Disease, Stroke, and Gallbladder disease.
We adhere to the standard USA Imperial formula:
BMI = [Weight (lbs) / Height (inches)²] * 703Premiums are often lower for people in the "Healthy Weight" range.
Branches like the Army and Navy use BMI as a preliminary screening tool.
This calculator is for adults 20 and older. For children and teens, BMI is interpreted differently (using percentiles).
Disclaimer: Educational use only.