BMI Calculator
This tool has been used times.
Enter any two values in a row to calculate the third.
Mode
Height (cm)
Weight (kg)
BMI
Category
① BMI
② Weight
③ Height
How to Use
- 3 Calculation Modes
- ① BMI: Enter height and weight to calculate your BMI. ② Weight: Enter height and a target BMI to find the corresponding weight. ③ Height: Enter weight and BMI to find the corresponding height.
- Metric / Imperial Toggle
- Switch between Metric (cm/kg) and Imperial (ft+in/lbs) using the buttons at the top. All entered values are automatically converted when you switch.
- BMI Meter
- The color bar shows where your BMI falls on the WHO scale. The white marker indicates a Normal BMI of 22. The dark marker shows your result.
- Ideal Weight
- Shows your ideal weight at BMI 22 and the difference from your current weight. Green means you are at or near the ideal; red means you exceed it.
- Auto-Save
- Your height and weight are saved locally in your browser and auto-filled on your next visit. Tap “Clear All” to erase saved data.
- About BMI
- BMI is a population-level screening tool, not a personal diagnostic measure. It does not account for muscle mass, bone density, age, sex, or body composition. Always consult a healthcare professional for a full health assessment.
BMI Categories (WHO)
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Normal |
| 25.0 to 29.9 | Overweight |
| 30.0 to 34.9 | Obese I |
| 35.0 to 39.9 | Obese II |
| 40.0 and above | Obese III |
A BMI of 22 is used as the ideal reference. BMI is a screening tool and does not account for muscle mass, age, or body composition. Consult a healthcare professional for a full assessment.
FAQ
- What is the BMI formula?
- BMI = weight (kg) ÷ height (m) ÷ height (m). For example, at 170 cm and 60 kg: 60 ÷ 1.7 ÷ 1.7 ≈ 20.8. With Imperial units, the formula is 703 × weight (lbs) ÷ height (in)². This tool calculates it automatically either way.
- Why is BMI 22 used as the ideal?
- Statistically, people with a BMI around 22 tend to have the lowest risk of lifestyle-related conditions such as high blood pressure. Ideal weight = 22 × height (m) × height (m).
- Does muscle make BMI higher?
- Yes, it can. BMI uses only height and weight, so it cannot distinguish muscle from fat. Muscular people may be classified as overweight while having low body fat. Treat BMI as a rough guideline.
- What is a healthy BMI range?
- According to the WHO, a BMI of 18.5 to 24.9 is considered Normal. Being underweight (below 18.5) also carries health risks, so avoid aiming too low.