BMI Calculator
Calculate your Body Mass Index instantly. Enter height and weight in metric or imperial units — see your BMI score and health category right away.
About This Tool
BMI (Body Mass Index) is a simple screening measure that uses height and weight to estimate body fatness and associated health risk. QuickKit's BMI calculator supports both metric (cm/kg) and imperial (ft·in/lbs) units, giving you an instant result along with a colour-coded health category — all computed locally in your browser with no data sent anywhere.
Features
- ✓Metric & Imperial — Switch between cm/kg and ft·in/lbs with a single tap.
- ✓Instant Result — BMI value and health category update immediately on click.
- ✓Visual Health Bar — A colour bar marks your position across Underweight → Obese range.
- ✓Privacy-first — All calculations happen in your browser — no data leaves your device.
FAQ
- What is a healthy BMI?
- A BMI between 18.5 and 24.9 is considered normal weight for adults. Below 18.5 is underweight; 25–29.9 is overweight; 30 and above is classified as obese.
- Is BMI accurate for everyone?
- BMI is a general screening tool and does not account for muscle mass, bone density, age, sex, or ethnicity. Athletes and older adults may get misleading results. Consult a healthcare professional for a full assessment.
- How is BMI calculated?
- BMI = weight(kg) ÷ height(m)². For imperial units, BMI = (weight(lbs) ÷ height(in)²) × 703.
- Why does my result look different from other calculators?
- Minor rounding differences may occur. Our formula follows the standard WHO definition rounded to one decimal place.