Body mass index (BMI) calculator
Calculate your body mass index from your weight and height and see the normal weight range for your height.
Underweight: < 18,5
Normal weight: 18,5–24,9
Overweight: 25–29,9
Obese: ≥ 30
Calculations are based on Estonia's tax rates in force for 2026. Results are informational.
Last updated: 2026-06-03
What is body mass index?
Body mass index (BMI) is your weight (kg) divided by the square of your height (m²). A BMI below 18.5 is underweight, 18.5-24.9 normal, 25-29.9 overweight and 30 or more obese. BMI is an indicative measure and does not account for muscle mass or build.
How it is calculated
Formula
BMI = weight (kg) ÷ height (m)². Underweight < 18.5; normal 18.5-24.9; overweight 25-29.9; obese ≥ 30.
Example
70 kg, 175 cm → 70 ÷ 1.75² ≈ 22.9 (normal).
Frequently asked questions
What BMI is normal?+
A normal weight is a BMI of 18.5-24.9. Below 18.5 is underweight, 25-29.9 overweight and 30 or more obese.
How is BMI calculated?+
BMI = weight (kg) divided by the square of height (m²). For example, 75 kg and 178 cm give a BMI of 23.7.
Is BMI suitable for everyone?+
BMI is an indicative measure and ignores muscle mass, build and age, so it can be misleading for athletes.