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How to check BMI & healthy weight
Convert height and weight across feet, stone, pounds and metric — with a live BMI and your healthy-weight range.
Body & Health converts height and weight between US, UK and metric and computes BMI live — with a color band and a healthy-weight range for your height.
Enter your height
Open Body. Enter your height in feet & inches or centimeters — a toggle switches units and shows the equivalent (e.g. 5′9″ · 175.26 cm).
Enter your weight
Add your weight in stone, pounds or kilograms. Like height, the unit toggles and converts instantly, so you can work in whatever system you know.
Read your BMI and healthy range
Your Body Mass Index shows live with a color band (under / healthy / over / obese) and a plain-language label — e.g. 23.6 · Healthy weight — plus the healthy-weight range for your height (e.g. 125–169 lb).
Switch systems as needed
Use the US / UK / Metric switch to reframe everything for your region. All values convert together so nothing gets mixed up.
Making sense of a US fitness plan. Lena knows her height in cm and weight in kg, but her plan talks in feet and pounds. She enters 175 cm and 73 kg; the tool shows 5′9″, 160 lb, a BMI of 23.6 (Healthy weight) and a healthy range of 125–169 lb — all without doing any math herself.
Toggle each field between metric and imperial to instantly see your height and weight both ways — useful when a plan or doctor uses different units.
BMI and sizing figures are general guides, not medical diagnoses. BMI doesn't account for muscle mass or body composition. Consult a qualified healthcare professional for personal health decisions.
Frequently asked questions
How is BMI calculated?
BMI is your weight in kilograms divided by your height in meters squared. Body & Health does the unit conversion and the math live as you type.
What is a healthy BMI range?
A BMI of roughly 18.5–24.9 is generally considered the healthy range for adults. The tool also shows the healthy-weight range in pounds or kilograms for your height.
Is Body & Health medical advice?
No. BMI and sizing figures are general guides, not medical diagnoses. Consult a qualified healthcare professional for personal health decisions.