Height & Weight Imperial ↔ Metric Converter
Convert feet/inches (ft/in) to centimeters (cm) and pounds/stones (lbs/st) to kilograms (kg) with live BMI calculator
Quickly convert height and weight measurements between the US/Imperial system and the Metric system. It supports compound inputs like feet+inches and stone+pounds, and automatically estimates your Body Mass Index (BMI) in real time.
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How to use
- To convert height, select the 'Height Conversion' tab. To convert weight, select 'Weight Conversion'.
- Type imperial values (ft/in or st/lbs) to instantly see the metric equivalents (cm, kg).
- Alternatively, input metric values (cm, kg) to reverse-convert back to imperial values.
- Check your estimated BMI score and weight range classification in the right bonus panel.
FAQ
- What is a 'stone' (st) weight unit?
- A stone is a unit of weight commonly used in the UK and Ireland for human body weight. 1 stone equals 14 pounds (approx. 6.35 kilograms). This tool provides a dedicated stone+pounds input field for easy usage.
- How is the BMI calculated here?
- Body Mass Index (BMI) is calculated as weight in kilograms divided by height in meters squared (kg/m²). This tool dynamically recalculates your BMI using the converted metric heights and weights.
- Is the BMI result an absolute health standard that applies the same way to everyone?
- No. BMI is a simple reference figure calculated from height and weight alone, and it can't distinguish muscle mass from body fat. That means muscular athletes or bodybuilders with low body fat can show up as 'overweight' on the BMI scale, while an older adult with low muscle mass might fall in the 'normal' range despite having a higher body fat percentage. For an accurate assessment that accounts for age, sex, and muscle mass, it's best to consult a medical professional.