Body Mass Index Calculator: BMI = mass/height² | Biology Formula

Body Mass Index Calculator

❤️ The human body. Use the Body mass index formula to find bmi, mass, height: pick the value you want, type the others, and the answer updates as you go.

\text{BMI} = \dfrac{\text{mass}}{\text{height}^2}

Adults: 18.5–25 is the healthy range. BMI doesn’t tell muscle from fat.

BMI (kg/m²)Mass (kg)Height (m)

BMI22.857 kg/m²

Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.

What each letter means

Quantity	Unit
BMI	kg/m²
Mass	kg
Height	m

Worked example

Find the bmi when Mass = 70 kg, Height = 1.75 m.

Using BMI = mass/height²: BMI = 22.857 kg/m².

Frequently asked questions

What is the formula for Body mass index?

BMI = mass/height². Adults: 18.5–25 is the healthy range. BMI doesn’t tell muscle from fat.

What do the letters stand for, and what units are used?

BMI in kg/m², Mass in kg, Height in m.

How do you calculate bmi?

Put the values into BMI = mass/height². For example, with Mass = 70 kg, Height = 1.75 m, bmi = 22.857 kg/m².

Can I solve for a different value?

Yes. In the calculator above, pick the circle next to any value (bmi, mass, height) and fill in the others: it rearranges the formula for you.