BMI Calculator

Calculate Body Mass Index in Metric or Imperial units for US & UK users. Get a live BMI radar meter, category, and a healthy weight range estimate — all instantly.

Calculate your BMI

Choose units, enter height and weight, then press calculate. Results update the radar meter and category chart.

Optional: shows female-focused notes below the results.
Example: 165 cm
Example: 62 kg
Example: 5 ft 6 in
Example: 137 lb
Your result
BMI: — Category: —
Healthy weight range (BMI 18.5–24.9)
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Enter values and calculate to see your BMI and range.
Formula used
Metric: BMI = kg / m²
Imperial: BMI = 703 × lb / in²

BMI Radar Meter

A simple visual gauge from BMI 14 to 40+. The needle updates after calculation.

14 18.5 25 30 40+
— WHO adult BMI categories
Female note: BMI is a helpful screening tool, but body composition can vary across life stages (e.g., postpartum, perimenopause/menopause). If your BMI is near a boundary (like 24.9 vs 25.1), focus on trends over time and consider additional measures such as waist circumference or discussing clinical guidance.

BMI categories, chart, and how to interpret your result

BMI (Body Mass Index) compares your weight to your height using a standard formula. It’s widely used in the USA and UK as a quick screening number because it’s consistent across metric and imperial inputs. BMI does not directly measure body fat, but it can help identify whether your weight is generally in a range associated with lower or higher health risk.

Adult BMI category chart (WHO)

Category BMI range What it usually means
Underweight < 18.5 May indicate low body weight or nutrition concerns.
Normal 18.5 – 24.9 Generally associated with lower health risk for many adults.
Overweight 25.0 – 29.9 Higher risk for some conditions; consider lifestyle review.
Obesity ≥ 30.0 Higher risk; consider professional guidance.

BMI formula (metric + imperial)

Metric: BMI = weight (kg) ÷ [height (m)]²
Imperial: BMI = 703 × weight (lb) ÷ [height (in)]²

Healthy weight range (practical use)

A common next question is: “What weight range puts me in the normal BMI range?” This page calculates an estimated healthy weight range using BMI 18.5–24.9 for your height. It’s a useful planning tool for goals, but it’s not a medical diagnosis.

Important: BMI is less accurate for:
  • Highly muscular athletes (BMI may overestimate fat).
  • Pregnancy (use pregnancy-specific medical guidance).
  • Older adults (body composition changes over time).
  • Extremely short/tall individuals (BMI can be less representative).
This calculator provides general information for adults and is not medical advice. If you have health concerns, consult a qualified healthcare professional.
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Related Health Tools

Often used together with BMI.

Calorie Calculator → BMR Calculator → Body Fat Calculator → Ideal Weight Calculator → Pace Calculator →