Enter your height in feet/inches and weight in pounds to see the metric equivalents and your BMI calculated both ways.
This tool converts your height and weight from US units (feet/inches, pounds) to metric (centimeters, kilograms), then calculates BMI using both the US and metric formulas so you can see they agree.
Height: ft in
Weight: lb
How It Works
This tool converts your height and weight from US units (feet/inches, pounds) to metric (centimeters, kilograms), then calculates BMI using both the US and metric formulas so you can see they agree.
How to Use This Tool
- Enter your height in feet and inches.
- Enter your weight in pounds.
- Click Convert to see the metric equivalents and BMI in both unit systems.
The US and metric BMI formulas are mathematically equivalent once units are converted; any tiny difference shown is just rounding.
Did You Know?
- The metric BMI formula (kg divided by meters squared) is the original version; the US formula with the 703 multiplier is simply a unit-adjusted equivalent.
- Most of the world uses the metric system for health measurements, which is why many international health references use kg and cm by default.
Frequently Asked Questions
Why would the two BMI numbers differ slightly?
They should match closely; any tiny difference comes from standard unit-conversion rounding, not a different calculation.
Can I enter metric units directly instead?
This tool is built for US input converted to metric output; for a metric-only calculation, use the standard BMI Calculator.