BMI Calculator
Enter height in centimetres and weight in kilograms, then press Calculate to get BMI rounded to two decimals. Height is converted to metres inside the formula so you do not need to do that step yourself.
Updated 2026-08-03 · health
Click Calculate.
About this tool
The form asks for Height (cm) and Weight (kg). On Calculate, centimetres become metres (divide by 100), then BMI equals weight divided by height squared. Valid pairs print BMI: x.xx; missing or non-finite values show Enter valid values instead.
How to use
- Enter height: Type your height in centimetres in the Height (cm) field.
- Enter weight: Type your weight in kilograms in the Weight (kg) field.
- Calculate BMI: Click Calculate to run weight ÷ (height in metres)².
- Read the score: Use the BMI: x.xx line, or correct inputs if Enter valid values appears.
Common use cases
- Track BMI during a fitness plan that already logs cm and kg.
- Fill a clinic or sports form that asks for BMI from metric measurements.
- Compare today’s BMI after updating height or weight figures.
Tips
- Height must be in centimetres (for example 170), not metres.
- Zero or blank height cannot produce a BMI—fix the fields if you see the validation message.
FAQ
Which units does this BMI tool accept?
Height in centimetres and weight in kilograms only.
How many decimal places appear?
The BMI is formatted with two decimal places via toFixed(2).
Does the tool label underweight or obese categories?
No. It returns the numeric BMI only; category charts are outside this calculator.
Why do I get Enter valid values?
Height converted to metres must be non-zero, and weight must be a finite number.